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pdfMarine Debris Monitoring and Assessment:
Recommendations for Monitoring Debris Trends in the
Marine Environment
NOAA Marine Debris Program
National Oceanic and Atmosphereic Administration
U.S. Department of Commerece
Technical Memorandum NOS-OR&R-46
November 2013
Photo taken by U.S. National Park Service, Kenai Fjords National Park
Mention of trade names or commercial products does not constitute
endorsement or recommendation for their use by the United States
government.
Marine Debris Monitoring
and Assessment
Recommendations for Monitoring Debris
Trends in the Marine Environment
Sherry Lippiatt1,2, Sarah Opfer2,3, and Courtney Arthur1,2
1
I.M. Systems Group; Rockville, MD, USA
2
U.S. National Oceanic and Atmospheric Administration, Marine Debris Program;
Silver Spring, MD, USA
3
Earth Resources Technology; Laurel, MD, USA
The suggested citation for this document is:
Lippiatt, S., Opfer, S., and Arthur, C. 2013. Marine Debris Monitoring
and Assessment. NOAA Technical Memorandum NOS-OR&R-46.
For copies of this document, please contact:
NOAA Marine Debris Division
1305 East-West Highway
Silver Spring, MD 20910 USA
Contents
EXECUTIVE SUMMARY ............................................................................................................ 1
1.0
INTRODUCTION ............................................................................................................... 2
1.1 Objectives and Method Development ................................................................................................ 3
1.2 Debris Classification ............................................................................................................................ 4
1.3 Safety .................................................................................................................................................. 5
2.0
SHORELINE METHODS ................................................................................................... 7
2.1 Debris Assessment Methods ............................................................................................................... 7
2.2 Standing‐stock surveys ........................................................................................................................ 8
2.3 Accumulation surveys ......................................................................................................................... 9
2.4 Survey Design .................................................................................................................................... 10
2.4.1 Site Selection .............................................................................................................................. 11
2.4.2 Sample Frequency ...................................................................................................................... 11
2.5 Equipment ......................................................................................................................................... 11
2.6 Pre‐Survey Shoreline Characterization ............................................................................................. 12
2.7 Shoreline Survey Methodology for Macro‐Debris (>2.5 cm) ............................................................ 13
2.8 Sampling for Meso‐ (5 mm – 2.5 cm) and Micro‐Debris (≤5 mm) .................................................... 16
2.9 Quality Control .................................................................................................................................. 17
2.10 Considerations ................................................................................................................................ 18
3.0
SURFACE WATER METHODS ...................................................................................... 19
3.1 Floating debris survey techniques .................................................................................................... 19
3.2 Survey Design .................................................................................................................................... 20
3.2.1 Site Selection .............................................................................................................................. 20
3.2.2 Sample Number and Frequency ................................................................................................ 21
3.3 Equipment ......................................................................................................................................... 22
3.4 Pre‐Survey Site Characterization ...................................................................................................... 23
3.5 Surface Water Trawl Survey Methodology (> 0.30 mm) .................................................................. 24
3.5.1 Trawling technique ........................................................................................................................ 24
3.5.2 Sample Processing ......................................................................................................................... 25
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3.6 Data analysis ..................................................................................................................................... 26
3.7 Quality Control .................................................................................................................................. 26
3.8 Considerations .................................................................................................................................. 27
3.8.1 Survey design ............................................................................................................................. 27
3.8.2 Technique ................................................................................................................................... 27
3.8.3 Data analysis .............................................................................................................................. 28
3.8.4 Relevance ................................................................................................................................... 28
4.0
AT-SEA VISUAL SURVEY METHODS ........................................................................ 30
4.1 Background ....................................................................................................................................... 30
4.2 Survey Design .................................................................................................................................... 31
4.3 Equipment ......................................................................................................................................... 31
4.4 At‐Sea Visual Survey Technique ........................................................................................................ 31
4.5 Considerations .................................................................................................................................. 33
5.0
BENTHIC METHODS ...................................................................................................... 34
5.1 Background ....................................................................................................................................... 34
5.2 Survey Design .................................................................................................................................... 35
5.2.1 Site Selection .............................................................................................................................. 35
5.2.2 Sample Frequency ...................................................................................................................... 35
5.3 Shallow Environments (< 20 m) ........................................................................................................ 35
5.4 Continental Shelves (up to 800 m) .................................................................................................... 36
5.5 Deep Sea Floor .................................................................................................................................. 37
5.6 Considerations .................................................................................................................................. 38
6.0
REFERENCES .................................................................................................................. 39
7.0
APPENDICES ................................................................................................................... 47
7.1 Literature Review Tables ................................................................................................................... 48
7.2 Shoreline Survey Advisory Group ..................................................................................................... 51
7.3 Versar, Inc. Executive Summary ........................................................................................................ 52
7.4 Random Number Tables ................................................................................................................... 54
7.5 Data sheets ....................................................................................................................................... 56
7.6 Marine Debris Survey Photo Manual ................................................................................................ 69
7.7 Frequently Asked Questions for Shoreline Surveys .......................................................................... 77
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EXECUTIVE SUMMARY
Marine debris is defined by the National Oceanic and Atmospheric Administration (NOAA) and
the United States Coast Guard (USCG) as any persistent solid material that is manufactured or
processed and directly or indirectly, intentionally or unintentionally, disposed of or abandoned
into the marine environment or the Great Lakes (33 USC 1951 et seq. as amended by Title VI of
Public Law 112-213). Marine debris has become one of the most recognized pollution problems
in the world’s oceans and waterways today.
In recent years, research efforts have significantly increased knowledge of the topic of marine
debris. However, the field as a whole has not adopted standardized monitoring procedures or
debris item categories. Standard methodology and reporting is necessary in order to compare
marine debris source, abundance, distribution, movement, and impact data on regional, national,
and global scales.
The NOAA Marine Debris Program (MDP) has developed standardized, statistically valid
methodologies for conducting rapid assessments of the debris material type and quantity present
in a monitored location. The monitoring guidelines in this document focus on abundance, types,
and concentration rather than analyzing by potential source, as in many cases it is very difficult
to connect a debris item to a specific debris-generating activity. These techniques are intended to
be widely applicable to enable comparisons across regional and global scales.
This document includes guidelines for estimating debris concentrations on shorelines, in surface
waters, during visual surveys at sea, and in the benthos. Background information is provided for
each environmental compartment (i.e., shorelines, surface waters, and the seafloor), in addition
to guidelines for survey design, required equipment, the survey techniques, and study
implementation considerations. The appendices include a brief literature review for each
compartment, survey data sheets, a debris item photo guide, frequently asked questions for
shoreline surveys, and a summary of work completed by Versar, Inc. to test the methodologies.
The techniques described in this document were developed over the course of a number of years,
based on a review of the literature, discussions with experts, and field testing by the MDP and
contractors. For shoreline monitoring, the MDP benefited from feedback from partner
organizations who implemented these methods prior to the official publication of these
guidelines.
The guidelines in this document are intended for use by managers, researchers, citizen scientists,
and other groups conducting marine debris survey and assessment activities, especially those
requiring a rapid assessment. Monitoring and assessment of marine debris is essential to
understanding the problem and being able to mitigate, prioritize, and prevent the most severe
impacts. The effort to develop this document was rooted in the need to standardize
methodologies and facilitate comparisons across time, space, and environmental compartments.
These guidelines are provided to the marine debris community at large in order to guide the
development of integrated monitoring programs nationwide.
1
1.0 INTRODUCTION
Marine debris, in some form, has been addressed by NOAA since the early 1980s and officially
recognized as a problem by the federal government since the passing of the Marine Plastic
Pollution Research and Control Act (MPPRCA) in 1987 (Public Law 100-220, Title II). This
legislation was one of the first to provide research prioritization and authorize federal funding for
marine debris in the United States. The NOAA Marine Debris Program (MDP) was initiated as a
program in 2005 within the National Ocean Service’s Office of Response and Restoration and
was legally established by the Marine Debris Act (33 U.S.C. 1951 et seq., as amended by Title
VI of Public Law 112-213). The act provides specific mandates to the program including
mapping, identification, impact assessments, removal and prevention activities, research and
development of alternatives to gear posing threats to the marine environment, and outreach
activities.
Standardized marine debris monitoring and assessment can be used to evaluate the effectiveness
of policies to mitigate debris, such as recycling incentives or extended producer responsibility
measures, and provide insight into priority targets for prevention and mitigation (NRC 2008).
For example, in the Gulf of Alaska, the NOAA Alaska Fisheries Science Center conducted
shoreline monitoring prior to and following the implementation of the International Convention
for the Prevention of Pollution from Ships (MARPOL); results indicated a significant decrease in
the abundance of derelict fishing gear debris, in the form of nets from ships (Maselko and
Johnson, 2011). Similarly, debris monitoring in Washington DC and other areas with recentlyenacted policies on single-use shopping bags are indicating fewer plastic bags in rivers and in
riverine “trash traps” (e.g., Anacostia Watershed Society, unpublished data).
The complicated nature of the distribution of marine debris in the environment calls for a clear
and defined approach to characterizing and assessing the problem. Marine debris enters the
marine environment through many pathways, and the extensive size of the ocean, patchiness in
the distribution of debris, and spatial and temporal variability in the drivers of debris add to the
complex life cycle of marine debris (Ryan et al., 2009, Cole et al., 2011, Doyle et al., 2011). This
document updates and expands upon marine debris assessment guidelines developed by the
NOAA Marine Entanglement Research Program in 1992 (Ribic et al., 1992). The guidelines
outlined here incorporate modern technologies and sampling equipment and focus on
standardization of data and reporting for a statistically robust analysis which can address all
types of debris. Guidelines are included for estimating debris concentration on shorelines, in
surface waters, during visual surveys at sea, and in benthic surveys. The shoreline survey
technique described here is available in a user-friendly version in the NOAA Shoreline Survey
Field Guide (Opfer et al., 2012).
2
1.1 Objectives and Method Development
The guidelines in this document are intended to serve as a basis for nationwide monitoring and
assessment of marine debris, and were designed with four main objectives in mind:
Estimate the quantity of debris at local and regional levels according to land use or other
correlating parameter
Determine types and concentration of debris present by material category (plastic, metal,
glass, rubber, paper/processed lumber, cloth/fabric, other)
Examine the spatial distribution and variability of debris
Investigate temporal trends in debris types and concentration
This report includes guidelines for four survey techniques developed and/or modified by the
MDP:
Shoreline techniques: Guidance for assessing debris concentration on shoreline segments,
including both macro- (> 2.5 cm) and meso-debris (5 mm–2.5 cm)
Surface water techniques: Guidance for assessing floating debris concentration, including
macro-debris (>2.5 cm), meso-debris (5mm–2.5cm) and micro-debris (≤ 5 mm in length)
At-sea visual techniques: Guidance for conducting ship-based visual surveys of floating
macro-debris (> 5cm or 2 in)
Benthic techniques: Guidance for evaluating debris concentration on the seafloor
The methods detailed in this report take into consideration lessons learned from studies listed in
Section 7.1. Additionally, shoreline methods were developed with input from an established
advisory group. The advisory group consisted of established researchers in the debris monitoring
field, other federal agencies involved in marine debris efforts, and internal NOAA MDP staff
(Section 7.2).
The techniques for shorelines, surface waters, and at-sea visual surveys were tested and refined
by NOAA MDP staff during a pilot project in summer and fall 2009 - 2010 in the Chesapeake
Bay (Arthur et al., 2011). In 2011, the refined techniques were used during monthly surveys in
various tributaries of the northern Chesapeake Bay to test the hypothesis that debris
concentration is correlated with land-use (Lippiatt et al., 2012). Additionally, rigorous bi-weekly
shoreline and surface water sampling completed by Versar, Inc. from July through December
2011 at two sites in the mid-Atlantic informed statistical considerations described in Sections 2.0
and 3.0 of this document. The shoreline technique was also extensively used and tested by
regional and local groups along the U.S. west coast, Alaska, and Hawaii to monitor for the
arrival of marine debris generated by the 2011 Japanese tsunami.
In 2009, the United Nations Environment Program (UNEP) published a debris assessment
framework with the major goal of management and integration of debris monitoring activities
across broad geographic regions (Cheshire et al., 2009). The UNEP framework includes a set of
survey methods for beach, benthic, and floating debris assessment based on existing techniques
used in the Oslo and Paris Convention for the Protection of the Marine Environment of the
3
North-East Atlantic (OSPAR), the Northwest Pacific Action Plan (NOWPAP), Australian
Marine Debris Status (AMDS), and the National Marine Debris Monitoring Program (NMDMP)
(Cheshire et al., 2009). The approach taken in this document is modeled after UNEP’s
framework with a few key differences: NOAA techniques focus on item count and concentration
(in units that count debris items per square meter of shoreline, # items/m2) rather than both count
and weight information; NOAA shoreline survey techniques focus on assessment of debris
standing-stock rather than flux rate (however, the NOAA shoreline survey can be adapted for
accumulation surveys, see discussion in section 2.0, below); and the debris classification systems
vary between the two methods.
The application of these guidelines to discrete studies will be most informative when study
design and site selection address clearly stated objectives.
1.2 Debris Classification
Although previously published guidelines have focused on documenting the primary source of
debris (e.g., Sheavly, 2007), the methods described here emphasize material type.
Debris source information is an excellent educational tool, however many debris items are
difficult to identify as either land- vs. sea-based or industrial- vs. consumer-based debris. The
source of a piece of debris found in the open ocean cannot necessarily be attributed to the
manufacturing origin or country of consumption. Even when the debris has markings that can be
used to identify where it was produced, the exact point of loss to the environment is unknown.
Original sources of floating marine debris in the oceans can be difficult to identify, given the
persistence and potential for long-range transport of lightweight buoyant materials (Ryan et al.,
2009).This makes it difficult to evaluate controls on the land- or ocean-based sources of marine
debris. Guidelines in this document take a tiered approach whereby every piece of debris is
recorded according to material category and then by specific item or product (as recommended in
Ribic et al., 1992). The material categories included are plastic, metal, glass, rubber,
paper/processed lumber, cloth/fabric, and other or non-classifiable debris. There is also the
allowance of “other” items that are locally important and may not be currently listed on the data
sheets. Further, these items can be catalogued and tracked in the www.md-map.net online
database (see Section 2.6). In this way, these guidelines allow for regional customization of
important debris items. Information on debris source can be obtained during data analysis if
indicator items are identified (e.g., plastic fishing floats are assumed to be sea-based debris).
Furthermore, this approach enables analysis of variability in the composition and quantity of
debris over time and space. The NMDMP effort (described in further detail in section 2.0), which
collected information on specific indicator items, was designed to evaluate debris trends on a
regional scale and was not suitable to local-scale assessments of spatial and temporal variability
in debris types and quantities (Sheavly, 2007, NRC 2008, Ribic et al., 2010, Sheavly, 2010,
Ribic et al., 2011, Ribic et al., 2012).
The methods described here do not include debris weight information. Debris weight can be
challenging to measure and dependent on water content; reporting in units of debris counts (e.g.,
4
#items/m2 of shoreline or #items/m3 of water) provides more reliable and consistent data and
techniques that are more accessible to organizations that may not have means of accurately
weighing debris. Other programs that are not meant to be part of a rapid response technique or
wish to factor in how physical properties such as weight, density, and form affect debris
hydrodynamics and fate, may want to collect weight data.
Debris items encountered during these surveys is differentiated based on size class. Both the
shoreline and surface water sampling strategies distinguish between large (>30cm) and small
debris items (<30cm). Large debris items have a larger surface area and therefore have a greater
potential to disturb valuable habitat. Additionally, large debris items may be less mobile in the
environment and may be encountered more than once in reoccurring surveys. Having a record
and location of these items will limit the potential errors in duplication. Figure 1, below,
indicates the debris size ranges sampled by the techniques described here.
Figure 1. Size ranges sampled by the techniques suggested in this document.
1.3 Safety
Safety should be the number one priority during any survey activity. Because this work is carried
out in the field, there are inherent hazards associated with these techniques. Use caution and
follow general safety guidelines. The safety tips below are provided as general guidance, but it is
imperative that project leads understand all risks associated with survey activities, always use
caution, and conduct an operational risk assessment for the specific marine debris survey activity
and location. Operational risk assessments should include resources (e.g., equipment, boats,
communication, support, personal protective equipment), environmental hazards or
considerations (e.g., remoteness, surf zones), personnel (experience, training, physical and
mental fitness), weather, and mission complexity.
Follow the buddy system when conducting shoreline surveys and other field operations.
Let someone know where you are and when you expect to return.
Carry a means of communication for emergencies, for example a cell phone or radio. If
there is no reception use a GPS emergency responder or personal locator beacon.
5
Always carry a first aid kit. The kit should include an emergency water supply and
sunscreen, as well as bug spray.
Understand the symptoms of heat stress and actions to treat it. For more information, see
the OSHA website (https://www.osha.gov/SLTC/heatstress/heat_illnesses.html). Make
sure to carry enough water.
Be prepared for the weather and tides. Do not conduct field operations in severe weather
and when tides could impede the survey area or block an access route.
Wear appropriate clothing. Be sure to wear close-toed shoes and gloves when handling
any non-hazardous debris as there may be sharp edges.
Be aware of your surroundings and be mindful of trip and fall hazards.
While on a vessel, always wear your life jacket and make sure it fits correctly.
Large, heavy objects should be left in place. Do not attempt to lift heavy debris objects as
they may have additional water weight and lifting them could result in injury.
If you are conducting surveys in the United States and you come across a potentially
hazardous material (e.g., oil or chemical drums, gas cans, propane tanks), contact local
authorities (a 911 call), a state emergency response or environmental health agency, and
the National Response Center at (1-800-424-8802) to report the item with as much
information as possible. Do not touch the material or attempt to move it.
When in doubt, don’t pick it up! If unsure of an item, do not touch it. If the item is
potentially hazardous, report it to the appropriate authorities.
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2.0 SHORELINE METHODS
Marine debris monitoring on shorelines has become an increasingly common undertaking for
academic, government, and environmental organizations. Shoreline surveys are usually more
accessible, inexpensive, and straight-forward than monitoring in other environmental
compartments. Often the highest debris concentrations are found on shorelines, which facilitates
data analysis and trend assessment.
In addition to lessons learned from the studies listed in Section 7.1 and described below, these
methods were developed with input from an established advisory group. The advisory group
consisted of researchers in the debris monitoring field, other federal agencies involved in marine
debris efforts, and NOAA MDP staff (Section 7.2). Data sheets modified here (Section 7.5) were
adapted from UNEP and the Intergovernmental Oceanographic Commission (UNEP/IOC) debris
monitoring guidelines (Cheshire et al., 2009).
2.1 Debris Assessment Methods
Numerous marine debris monitoring programs exist throughout the world. Most programs have
unique objectives and employ a variety of region-specific methodologies, making across the
board comparisons of debris estimates difficult (e.g., Barnes et al., 2009). For shorelines, some
studies report number (or weight) of debris items per unit length of shoreline (e.g., Bowman et
al., 1998, Barnes and Milner, 2005) or strandline (e.g., Velander and Mocogoni, 1999) while
others report number (or weight) of items per unit area of shoreline (e.g., Acha et al., 2003).
In addition to the NOAA Marine Entanglement Research Program guidelines mentioned above
(Ribic et al., 1992), lessons learned from previous marine debris monitoring efforts were
considered during development of these guidelines. One key long-term, large scale monitoring
program, the National Marine Debris Monitoring Program (NMDMP), was developed by an
interagency working group consisting of the U.S. Environmental Protection Agency, NOAA,
National Park Service, and United States Coast Guard following the ratification of MARPOL
Annex V and the passage of the MPPRCA. NMDMP was designed to assess the magnitude of
the marine debris problem in the U.S. and evaluate any regional or temporal trends according to
a statistically valid design and sampling plan (Escardó-Boomsa et al., 1995). The NMDMP
study, which consisted of monthly surveys conducted by trained volunteers at randomly selected
sites along the U.S. coastline, used indicator items to identify the major sources of debris
(Sheavly, 2007). Monitoring occurred from 1996 to 2006 and an analysis of data from a five year
time period (2001 – 2006) is provided in Sheavly (2007). The five year analysis showed no
statistical change in the prevalence of the indicator items for the nation as a whole (regional data
analyses are found in Ribic et al. (2010), Ribic et al. (2011), and Ribic et al. (2012)).
This NOAA shoreline survey technique is designed as a rapid, quantitative beach assessment for
collection of standardized and consistent data that can be applied to address policy and
management needs at various spatial scales. The UNEP framework mentioned above (Cheshire
et al., 2009) provides two different beach survey techniques – comprehensive and rapid beach
7
assessments. This NOAA shoreline technique is designed to be useable by trained community
volunteer organizations while simultaneously providing data that can be used to address key
management questions. Table 1 provides a comparison of the two survey techniques.
Removal of shoreline debris?
UNEP
Yes
NOAA
No/Yes*
Report item count or weight?
Both
Count only
100 – 1000 m
100 m sections
Yes
Yes
2.5 cm
2.5 cm
At least every 3 months
Every 28 days +/- 3 days
10-m wide transects
Sieve protocol
Large items recorded separately?
Yes
Yes
Specialized equipment required?
Scale for weight
No
Shoreline site length
Site characterization included?
Minimum debris size
Recommended survey frequency
Smaller item protocol?
Table 1. Comparison of NOAA and UNEP shoreline survey guidelines.
* NOAA standing-stock techniques can be adapted for shoreline cleanup efforts. See Section 2.3, below.
2.2 Standing-stock surveys
The shoreline technique described in this document is designed as a standing-stock assessment
survey. Standing-stock surveys are used to measure the load or concentration of debris at a
shoreline site over time. Each survey event is a snapshot of the concentration of debris at the site,
and a series of these snapshots over time provides information on changes in the baseline
concentration of debris. Knowing the concentration of debris (in units of #items/m2 of shoreline)
at various shoreline sites is necessary in evaluating the cumulative impact and conducting impact
or risk assessments of debris at a given site and on a regional scale. In standing-stock surveys,
the measured debris concentration reflects the long-term balance between inputs (land and sea
based) and removal (through export, burial, degradation, etc.). An understanding of how the
abundance of debris changes over time facilitates analysis of the drivers of debris deposition
(e.g., weather, tides, tourism, prevention efforts).
In order to obtain a valid time-series of debris concentration, the natural flux of debris onto and
off of the shoreline should not be altered by the survey activity. Integrity of the sample design
should be maintained by not removing debris from the site during standing-stock surveys. If
debris is removed from the shoreline site during a survey, the overall abundance of debris may
be underestimated at subsequent surveys. Exceptions should be considered if an item poses a
threat to human health or is potentially hazardous.
The standing-stock and residence time of marine debris on a given shoreline will vary with
characteristics of the debris itself, deposition from land- and sea-based sources, local climate and
seasonal weather patterns, and characteristics of the beach itself. Shoreline geomorphology,
substrate, exposure, and coastal current patterns are some of the factors that will affect whether a
given site tends to accumulate or capture debris.
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2.3 Accumulation surveys
The shoreline survey technique described here can be modified for accumulation surveys (see
Opfer et al., 2012). During accumulation surveys, marine debris is removed from the shoreline
site. Accumulation studies require initial removal of all debris from the site followed by regular
surveys to record and remove all debris. Because debris is removed from the site, the data
collected over time provides an estimate of the flux of debris onto the shoreline (in units of
#items/m2/time), as opposed to the concentration or standing-stock of debris. Both types of data
are useful for developing models of the life cycle and movement of debris among environmental
compartments. Accumulation survey data indicate the net flux of debris onto the shoreline, and
assume that the rate of debris accumulation is uniform between sample events. Debris flux data
can be used to assess changes in at-sea debris loads, but cannot be used to evaluate the debris
load or cumulative impacts of debris. Compared to standing-stock surveys, accumulation studies
require more time and money as they are more thorough, require debris removal, and need to be
conducted on a more frequent basis.
Accumulation survey frequencies must be identical for comparison between studies (Ribic et al.,
1992). Shoreline sites may have a relatively rapid debris turnover rate, so in order to accurately
estimate debris flux onto a shoreline site it must be sampled frequently. There is growing
evidence that accumulation rates are underestimated by typical survey frequencies. Eriksson et
al. (2013) found that daily accumulation rate measurements (i.e., surveys conducted on a daily
basis) were an order of magnitude higher than those measured during monthly surveys, and
Swanepoel (1995) suggested that daily accumulation rates were 100-600% higher than weekly
accumulation rates. Eriksson et al. (2013) further suggested that 12 days of consecutive sampling
at a given site may be more informative than monthly surveys over the course of one year.
However, Ryan et al. (2009) argue that longer intervals between sampling events reduces
variability in measured accumulation rates.
It is difficult to differentiate between factors that result in the deposition of debris onto the
shoreline. Depending on the timing of sampling events (e.g., just prior to or following a storm
event), the calculated net accumulation rate will likely vary. A debris marking study by Williams
and Tudor (2001) found that “old” debris can reappear on the shoreline following strong wind
events. Debris can become buried soon after deposition; in reality, accumulation studies are
measuring the accumulation rate of visible debris items (Ribic et al., 1992). Accumulation data
may also be affected by the lateral influx of debris from adjacent shoreline sites. Thus,
conducting shoreline surveys may not be a suitable proxy for estimating debris loads in the
ocean.
Given these considerations, accumulation studies may be appropriate based on study objectives.
For example, accumulation surveys can be used to look for a spike in debris deposition from a
major debris-generating event or variations due to climactic events (e.g., El Niño Southern
Oscillation; Morishige et al., 2007). Debris flux measurements are important to understanding
the life cycle of marine debris, and accumulation surveys will provide information on the relative
abundances of different debris types. To reduce the impacts of marine debris in critical habitats,
9
the benefit of more invasive accumulation surveys (with removal of debris) versus less intrusive
standing-stock surveys should be considered in these locations.
2.4 Survey Design
Previous studies have shown that varying amounts and types of marine debris accumulate on
shorelines depending on geographical location, oceanographic and meteorological conditions,
climatological patterns (such as El Niño), and proximity to land-based or ocean-based sources
(Morishige et al., 2007, Sheavly, 2007). To provide a more statistically relevant dataset,
monitoring sites should be randomly selected from appropriate strata (e.g., land use, commercial
and recreational fishing activities, political boundaries or management areas, storm water or
sewage outfalls). Because there are various factors affecting debris deposition on shorelines,
some studies have not detected significant differences in debris abundances between sites based
on stratifying parameters. For example, van Cauwenberghe et al. (2013) found that sedimentary
regime (i.e., accretion versus erosion) and tourism did not account for the debris loads they found
on Belgian shorelines. Further, Versar, Inc. (2012) did not find differences in debris loads based
on watershed land use.
The amount of sampling necessary to assess debris concentrations within a given region is
dependent on the spatial variability in debris concentrations and the desired level of detection
(i.e., in order to detect a smaller change in debris load, more sampling is required). Versar, Inc.
(2012) used a nested survey design to test the utility of the shoreline and surface water survey
techniques described here, which were developed based on a 100-m length of shoreline. At the
coarsest level, two regions in the coastal mid-Atlantic United States were selected based on land
use (urban vs. rural). Within each region, three 1000-m locations (stretches of shoreline) were
identified. Locations were required to meet all site selection criteria (listed below) and were
separated by at least 1200 m. Within each location, three 100-m shoreline sites were
systematically selected and remained fixed for the duration of the study. Surveys at the site level
were conducted on a bi-weekly basis for a period of six months in accordance with the standingstock technique described below. Results of the study indicated that there was more variability
(higher relative standard error) in debris concentrations among sites within a given location
compared to the variability between locations at the regional level. This suggests that in order to
decrease error in reported debris concentrations, shoreline surveys should be designed to assess
debris at the scale of a 1000-m location (i.e., random selection of transects within a 1000-m
location).
However, this technique was designed to be widely applicable, and it is recognized that in some
cases it is not possible to find a suitable 1000-m stretch of shoreline for location-level
assessment. Further, the European Union / Joint Research Centre Marine Strategy Framework
Directive (MSFD) recommends a study design that includes more than one 100-m site on a given
stretch of shoreline, or two sections of 50-m on heavily littered shorelines (MSFD, 2013). The
technique explained below is based on assessment of debris at one 100-m site, but it should be
noted that a study that includes more than one site on a given shoreline will provide more
statistically powerful results.
10
2.4.1 Site Selection
An assessment of the impact of marine debris surveys on the local environment should be
completed prior to commencement of any monitoring activities. In particular, monitoring should
not be conducted where there is the potential for impacts to endangered or protected species or
habitats. Organizations wishing to engage in marine debris monitoring activities are encouraged
to contact local land owners or managers and wildlife authorities during the site selection
process.
Shoreline survey sites should have the following characteristics:
Sandy beach or pebble shoreline
Clear, direct, year-round access (or seasonal access depending on physical conditions of
the site)
No breakwaters or jetties that affect local circulation and accumulate or inhibit debris
deposition
A minimum of 100 m in length parallel to the water (measured along the waters’ edge)
No regular cleanup activities. Sites do not need to be precluded solely because of annual
or semi-annual cleanup events, but activities need to be tracked and noted in data analysis
These characteristics should be met where possible, but should be analyzed on a case-by-case
basis and modified if appropriate for a particular region/location or shoreline type. The minimum
length of shoreline was selected based on UNEP recommendations for rapid assessment
(Cheshire et al., 2009). UNEP and MSFD (2013) suggest selecting shoreline sites that have a low
to moderate slope (15 – 45º). Shallow tidal mudflat areas can be very wide at low tide, and
marine debris is typically not very common in the intertidal. However, low-slope sites may still
be appropriate for surveys.
2.4.2 Sample Frequency
Biweekly testing in the coastal mid-Atlantic indicated that in most instances, individual sampling
events closely tracked monthly averages (Section 7.3). This finding suggests that sampling once
every 28 days provides an accurate snapshot of debris concentration for the month. Following on
recommendations from the National Marine Debris Monitoring Program (Sheavly, 2007),
surveys should occur within a three-day window of the scheduled sampling event (i.e., shoreline
standing-stock surveys should occur once every 28 ± 3 days).
2.5 Equipment
The following items are suggested for shoreline standing-stock assessments:
Digital camera
Hand-held GPS unit
Extra batteries (suggest rechargeable batteries)
Surveyor’s measuring wheel
Flag markers/stakes
11
100-foot measuring tape (fiberglass preferred)
First aid kit (to include sunscreen, bug spray, drinking water)
Work gloves
Sturdy 12-inch ruler
Clipboard for each surveyor
Data sheets (printed on waterproof paper)
Pencils
For meso- and microdebris assessment:
o 5-mm stainless steel sieve
o Stainless steel tweezers/forceps
o 32-ounce (~1 L) amber glass sample bottles with lids
o Wide-mouth funnel (stainless steel) to fit glass bottles
o Plastic bucket
o Quadrat kit (1 m2)
o Small folding shovel
o Waterproof paper for labels
o Permanent markers
2.6 Pre-Survey Shoreline Characterization
Before any sampling begins, shoreline characterization should be completed for each 100 m site.
Each survey site should be measured and marked for accuracy and repeatability using a
surveyor’s measuring wheel. This includes recording GPS coordinates in decimal degree format
(DDD.DDDD N/W) at the start and end of each 100 m segment (note that locations in the
southern or western hemispheres will have negative latitudes or longitudes). If the shoreline
width is greater than 6 m, GPS coordinates at all four corners of the shoreline section should be
recorded where possible. Additionally, a shoreline ID name should be created and used for the
duration of the study (this name will be used for reference in the www.md-map.net database1).
Shoreline characteristics and surrounding land-use characteristics (e.g. primary land use, nearest
town, nearest river, etc.) should also be recorded on the data sheets prior to survey activity.
Shoreline characteristics include identification and uniformity of the primary substrate type
(sand, cobble, etc.), the tidal range and distance (if applicable), a description of the first barrier at
the back of the shoreline section (dunes, vegetation, etc.), and the aspect of the shoreline. It is
important to record the distance to outfalls, rivers, and other potential sources of marine debris as
well as local current patterns which can affect debris deposition. Digital photographs should be
taken to document the physical characteristics of the monitoring site. Unless major changes
occur to the shoreline, shoreline characterization only needs to be completed once per site per
year. As mentioned above, changes in beach morphology (e.g., as a result of storm activity) may
result in changes in debris deposition.
1
At the time of publication, the NOAA MDP online database for shoreline survey data is housed at www.mdmap.net. The database allows users to create custom debris items within the existing NOAA datasheet framework
and facilitates data export and analysis. For information or access to the database, email [email protected].
12
2.7 Shoreline Survey Methodology for Macro-Debris (>2.5
cm)
In order to analyze the maximum width of the shoreline section during a relatively rapid beach
assessment, sampling should be conducted within three hours of low tide. This constraint is made
for the following reasons:
Basing surveys on tides provides a consistent starting point at the waters’ edge. Wrack
lines are inadequate reference points as they move and change throughout the year.
Some shoreline sites are inaccessible at high tide.
Low tide heights typically exhibit less variability than high tides, which allows for a
larger window of time to conduct surveys.
Surveys conducted just prior to high tide may miss debris deposited on the wrack line at
high tide.
Surveying the entire shoreline (including the intertidal) at all sites facilitates comparisons
of debris concentrations across sites. Data is representative of the entire shoreline site and
is not biased by a small sample size (Rees and Pond, 1995; Burnham et al., 1985).
Low tide provides a simple gauge of area surveyed. If a survey team does not have the
ability to measure beach width at a given survey, it may be a valid assumption that
approximately the same area of shoreline is being surveyed (we highly suggest testing
this for a given shoreline site prior to accepting this assumption).
Before arriving on site, select four numbers from the random number table (Section 7.4) to
eliminate any bias from visual inspection of the shoreline section. These four numbers
correspond with four transects of 5 m in length within the shoreline section that will be sampled
at this particular survey. The number of transects chosen for each sampling event correspond
with a 20% coverage of the shoreline section. Thus, on any sampling day 20 m of the 100 m
shoreline section is analyzed for debris.
Transects run perpendicular to the shoreline section from water’s edge, at the time of sampling,
to the back of the shoreline (Figure 2). The back of the shoreline is defined as the location of the
first barrier or primary substrate change. There might be a change in substrate within the
intertidal zone; in this instance the back of the shoreline should be defined such that it extends to
at least the high tide wrack line. Further, if there is evidence that storm or wave action is pushing
debris beyond the back of the shoreline, surveyors may be interested in recording these debris
items separately (e.g., in Alaska debris is commonly found in the wooded region behind the
shoreline). In this case, debris beyond the back barrier is recorded on a second data sheet and
tracked separately from debris on the shoreline.
Upon arrival at the site at low tide, use the surveyor’s measuring wheel to mark the selected
transects with flags and record transect GPS coordinates in decimal degree format. Depending on
the width of the shoreline section, the coordinate information can be recorded either at one point
in the middle of each transect (shoreline width <6 m or < ~19.5 ft) or at both the water’s edge
and back of each transect (shoreline width >6 m or ~19.5 ft; Figure 2). This designation is due to
the error associated with the operation of handheld GPS units. The GPS coordinates of each
transect are recorded for quality assurance and to track any changes of beach morphology over
13
the course of the study. For surveys conducted at high latitude locations, include information on
the GPS datum used in the notes section of the data sheet. In addition to GPS locations, record
ancillary data prior to the debris survey, which includes the length of each transect from water’s
edge to first barrier, the time, season, and date of last survey, description of recent storm activity,
current weather conditions, and the number of individuals conducting the transect survey. If
these characteristics are consistent between transects on a given survey event, they only need to
be recorded on one data sheet.
Figure 2. Shoreline section (100 m) displaying perpendicular transects from water’s edge at low tide to the first
barrier at the back of the shoreline section. Red circles indicate marked GPS coordinates. Shoreline width
determines location and number of GPS coordinates. Figure not to scale.
Once ancillary data are recorded, surveyors should walk each transect tallying debris items
according to material type and subcategory (see data sheets in Section 7.5). Debris items should
only be recorded if they are at least 2.5 cm in size on the longest dimension (Figure 3). This
standard length (approximately the diameter of a typical beverage bottle cap) was chosen to
ensure that the same size items are counted across surveys and to maintain consistency in survey
results. Data on debris < 2.5 cm has limited accuracy due to its small size compared to the
transect area. In practice, surveyors will inevitably miss a significant fraction of debris below this
size cutoff. This size cutoff for macro-debris surveys has also been adopted by UNEP (Cheshire
et al., 2009) and the MSFD (MSFD, 2011, MSFD, 2013). Recognizing that small items represent
14
an important size fraction of marine debris that may pose an even greater threat to marine life
(e.g., through ingestion), this technique suggests the use of subsampling within transects for the
assessment of meso- and micro-debris. The challenges with this approach, given the variability
in small debris concentrations within a shoreline transect, are discussed below.
Figure 3. The minimum debris size to be counted is 2.5 cm.
Large macro-debris items (> 30 cm or about 1 ft) are recorded on a separate section of the debris
data sheet. Large items should only be recorded in the large items section. Information recorded
should include the debris type, the status of the large item (sunken, stranded, or partially buried),
the latitude and longitude of the item, and the approximate debris size. This information is
important in determining the footprint of large debris items.
Any item that is partially within a transect should be tallied (however, items should not be tallied
twice if randomly selected transects are adjacent). If an item is blown into a transect mid-survey,
it is tallied only if the surveyor has not yet surveyed the section of the transect where the item is
located. Multiple fragments of what may have originally been a whole item should be tallied
separately. Capturing information on the total number of fragments present is a better reflection
of the debris impacts and effort required for cleanup. If one fragment is recognizable as a
specific item, for example a remnant of a plastic beverage bottle, it should be recorded as such
provided that the remnant is at least 50% of the original item (Tangaroa Blue Foundation, 2012).
Items that do not fall under a specific subcategory can be entered into the “other” category at the
end of each material section. In order to ensure that these standardized methods are widely
applicable, NOAA’s online shoreline survey database allows users to create custom debris
categories1. This allows researchers to track locally-relevant debris items within a nationallystandardized format.
If a surveyor is unsure of an item’s material type, it is tallied in the other/non-classifiable
category at the end of the data sheet. Include a brief description of the item in the notes section
for clarification. Items that are composed of multiple material types should be recorded
according to the most abundant material that makes up the surface of the item. For example, a
tire with a metal rim would likely be recorded as a large rubber item. A debris item photo guide
is included in Section 7.6. Digital photographs should be taken of unidentifiable items, as well as
other debris items or markings of interest. Place a lined ruler next to the debris item to establish a
size reference. It is also a good practice to take a photo of each transect surveyed, and record
photo ID numbers on the data sheet.
15
The macro-debris item concentration (number of debris items/m2) per transect is calculated as
follows:
C = concentration of debris items (# of debris items/m2)
n = # of macro-debris items observed
w = width (m) of shoreline section recorded during sampling (i.e, transect width)
l = length (m) of shoreline sampled = 5 m
Note that the shoreline width that is measured at each transect is essential for calculating debris
concentrations. For a given sampling event:
1. Calculate debris concentrations for each individual transect surveyed (a minimum of four
per survey).
2. Take the mean of the concentrations at each transect to calculate an overall site
concentration (± standard deviation) for that date.
The previously mentioned online database exports survey data (counts) and concentrations per
debris item category, material type, large debris, and total debris.
2.8 Sampling for Meso- (5 mm – 2.5 cm) and Micro-Debris
(≤5 mm)
Random samples can be collected from sandy beach locations for analysis of meso- and microdebris. For random sampling within a shoreline segment, use a random number table (Section
7.4) to select the placement of a 1-m2 quadrat. The placement of the number on the random
number table determines the location of the sample. For example, if random number seven was
chosen, the placement of the quadrat would be on the right side of the transect in the wrack line.
Because shoreline meso- and micro-debris concentrations are very patchy, random quadrat
placement may not always be the preferred method. During field testing in the coastal midAtlantic, meso-debris was very rare in randomly selected samples (meso-debris occurred in only
2-3% of sample events; Versar, Inc. 2012). Therefore, depending on study objectives, it may be
appropriate to focus meso-debris sampling on sections of the shoreline where small debris is
more likely to accumulate. Previous studies have suggested sampling along the wrack line,
where less re-suspension and thus higher debris concentrations are expected to occur, and to
avoid the effect of tidal height on the deposition of debris of various sizes and densities (Browne
et al., 2010). Van Cauwenberghe et al. (2013) found significantly higher concentrations of
microplastic at the high-water mark compared to the low-water mark on Belgian shorelines.
However, if samples are collected in a non-random fashion (i.e., focused on the wrack line),
results cannot be extrapolated over larger spatial scales.
16
Figure 4. Randomly placed 1 m2 quadrat with area of sand to be sieved (0.0625 m2) in bold.
Once the quadrat placement is selected, remove any pieces of debris from the surface that are
larger than 2.5 cm (and should have been counted in the macro-debris survey). Use a small
stainless steel shovel to collect the top 3 cm of sand from 1/16 of the quadrat (0.0625 m2). This
is done by dividing the quadrat into fourths and then dividing one of the quarters into fourths
(Figure 4). Sieve the collected sand through a stainless steel 5 mm mesh sieve above a bucket or
funnel and sample jar. If the sand is wet, use a water rinse to facilitate the sieving process
(seawater that has been sieved through a 0.33-mm screen is sufficient for this purpose). Transfer
the sieved micro-debris samples to labeled amber glass bottles for further analysis back in the lab
(Baker et al., 2013). If it is not possible to properly identify meso-debris items (> 5 mm) in the
field they should be collected and analyzed back in the lab. Repeat this process for each of the
four transects that were sampled for macro-debris.
Meso- and micro-debris item concentration (# of debris items/m3) is calculated as follows:
C = concentration of debris items (# of debris items/m3)
n = # of debris items observed
a = area sampled = 0.0625 m2
h = depth of sample = 0.03 m
Provided that samples are collected randomly, meso- and micro-debris concentrations for a given
sampling event can be calculated according to the same approach as for macro-debris (Section
2.7).
2.9 Quality Control
17
To ensure that all of the appropriately sized debris items within a transect are recorded, quality
control estimates should be conducted by a second surveyor before the collection of the mesoand micro-debris sample. The second surveyor should assess 20% of the total number of
transects sampled per site over the course of the study (e.g., one site visited monthly will have a
total of 48 transects and 10 quality assurance / quality control samples). Quality assurance
sampling should be distributed among different sampling events and include consideration of
debris classification.
2.10 Considerations
Shoreline surveys are the most accessible and cost-effective mode of marine debris monitoring
and assessment. Depending on study objectives, additional data collection needs may be
identified, for example debris location on the shoreline, number of beach visitors, or information
on debris biofouling. This information can be included in the notes section of the data sheets or
on a separate form. Surveys can be conducted by appropriately trained and managed volunteers
to reduce costs, but as with any citizen-science effort, volunteer coordination is a major (and
often overlooked) task. Site selection, proper debris classification, and survey schedule often
prompt questions from new volunteers. A frequently asked questions document is provided in
Section 7.7.
As mentioned above, care should be given to avoid threatened or endangered species and
habitats during site selection and while conducting surveys. While removal of debris from the
environment is an important endeavor, it is not a long-term solution. The distinction between
standing-stock and accumulation surveys, and the information gleaned from each, is important.
Leaving debris on the shoreline allows surveyors to assess the variation in debris loads over time,
which is essential information for quantifying the impacts of debris on the marine environment
and making the case for increased prevention and mitigation efforts.
18
3.0 SURFACE WATER METHODS
Floating marine debris has been noted by research and other vessels since 1971 (Carpenter et al.,
1972; Carpenter and Smith, 1972). However, few systematic quantification surveys have been
conducted throughout the oceans to develop a cohesive understanding of the extent and degree of
pollution from floating marine debris.
Reported debris concentrations range from less than 1 piece/km2 to 20,328 ± 2324 pieces/km2 in
the subtropical Atlantic Ocean (Law et al., 2010), to potentially higher concentrations in the
North Pacific Ocean (NRC 2008; see Section 7.1). In addition to a lack of standard sampling
methodologies, metrics vary by study objective which complicates debris concentration
comparisons. Weight and number of items are used to measure debris items, while area and
volume measure the matrix sampled (Section 7.1).
This section provides rigorous, standardized methodologies for assessing the amount and type of
floating anthropogenic debris and guidance for the development of a robust survey design for
coastal and offshore waters. Guidelines were developed to be flexible enough to conduct both
coastal and offshore assessments. A goal for these guidelines is to increase the amount of surface
water marine debris data that can be leveraged from tangentially-related organizations and
projects that routinely conduct surface trawling. Data collected can facilitate comparisons to
assess where floating debris is most prevalent and contribute to assessments of the eventual fate
and risk posed by the debris.
3.1 Floating debris survey techniques
Floating marine debris and debris suspended in surface waters has been documented across the
world in the open ocean and in coastal waters. In general, efforts to monitor oceanic marine
debris have been informal, with many anecdotal reports, few scientific expeditions that included
floating debris sighting surveys, and even fewer scientific expeditions dedicated to collection and
quantification of floating marine debris samples. Early marine debris sampling was often
conducted with pelagic plankton sampling. Methods have varied over the years to include
oblique plankton tows (Carpenter et al., 1972) and Neuston nets towed across surface waters
(Colton et al., 1974, Yamashita and Tanimura, 2007). In the North Atlantic Ocean, the Sea
Education Association used Neuston nets towed by a sailing vessel in a standard procedure to
produce a 22-year data set (Law et al., 2010). Moore et al. (2001b, 2002) published some of the
first reports that demonstrate the use of a manta net in conducting debris trawls. Brown and
Cheng (1981) note an advantage of the manta net is the two paravanes that attach to the frame
and allow the net mouth to skim the surface of the water. Thompson et al. (2004) determined
plastic fragment concentrations in archived samples collected with a continuous plankton
recorder.
Variability in the physical construction of nets, towing conditions, and overall technique make it
difficult to interpret temporal and spatial trends of floating debris concentrations. These studies
demonstrate a large variability in the physical construction of nets used in surface water debris
19
surveys, in terms of aperture, mesh size, and net length. Towing conditions, such as tow speed
and trawl length, vary depending on the overall study objective (Section 7.1). Reported mesh
sizes have ranged from 150 to 947 µm (NRC 2008) and though studies have not yet targeted
floating nano-sized debris particles, it is possible that these could be sampled with various
whole-water sampling techniques. Marine debris was investigated in new and archived surface
water plankton tow samples from the CalCOFI program (Gilfillan et al. 2009, Doyle et al. 2011),
which uses a manta net equipped with a flowmeter and 0.505 mm mesh for 15 minutes at a speed
of approximately 1.0-1.5 knots. These methods have been employed in standard plankton tows
for decades, and proved effective for sampling debris in surface waters.
We evaluated the methodology from published literature to develop the guidelines presented in
this document, which are heavily influenced by the California Cooperative Ocean and Fisheries
Investigations (CalCOFI). The surface water debris sampling technique and study design
described in this section were tested in a pilot sampling effort conducted in the Chesapeake Bay,
as well as in a more rigorous testing of nearshore coastal waters in the Delmarva Peninsula
(Versar, Inc. 2012).
3.2 Survey Design
Few studies have repeatedly sampled an area for marine debris using a standardized technique;
often measurements are tangential to primary study objectives and debris data are not published.
Even when long-term data exist, the patchiness of debris distribution may obscure expected
trends (Law et al., 2010).
To test the utility of the surface water guidelines described here, Versar, Inc. developed a nested
survey design (Versar, Inc. 2012; see Section 7.3). As discussed in Section 2.4, at the coarsest
level, two regions in the coastal mid-Atlantic United States were selected based on land use
(urban vs. rural). Within each region, three 1000-m locations (stretches of shoreline) were
identified. Adjacent to each location, nine surface water sampling stations were selected and
remained fixed for the duration of the study. To avoid tow direction bias, direction of the tow
was randomly assigned for each trawl. Surveys were conducted on a bi-weekly basis for a period
of six months in accordance with the sampling technique described below. Results of the study
indicate that floating macro-debris abundances in urban and rural locations did not differ
significantly, but differences among locations and temporal trends were detected using this
survey design.
Given the widely variable debris concentrations noted by published reports and during testing by
Versar, Inc., it is difficult to provide strict recommendations about survey design. Survey design
should consider the following suggestions while tailoring the study to address specific questions
about floating marine debris.
3.2.1 Site Selection
The coastal sampling design presented here pursues a regional perspective on floating debris and
its relationship to shoreline debris. Additional considerations for offshore sampling include
20
oceanographic conditions; known currents, eddies, convergence patterns, mixing, and seasonal
fluctuations therein; known or potential sources of marine debris; shipping lanes; and the
bathymetry and geomorphic structures that may influence the generation and eventual fate of
floating debris. Groups conducting offshore sampling are strongly encouraged to conduct
surveys in conjunction with ongoing marine research and/or water quality assessments.
To provide a statistically robust dataset, selected sites for coastal surface water sampling should
be stratified based on appropriate parameters, for example land use (e.g., urban, rural) associated
with nearby shorelines, fishing activities, or storm water or sewage outfalls. Random site
selection from each stratum (stratified random sampling) is a useful tool to assess temporal and
spatial variability while controlling for some of the expected variability and reducing sampling
error. In order to compare shoreline and adjacent surface water debris concentrations, shoreline
site selection should occur before any surface water site selection takes place.
Additionally, sites should have the following characteristics:
Direct, seasonal or year-round access, depending on location
Located within one nautical mile from shore for comparison to shoreline debris loads
No stationary or transient in-water barriers to ship transect path
Preferably areas that have not seen recent changes or manmade alterations to
hydrographic patterns
These characteristics should be met where possible, but should be analyzed on a case-by-case
basis and modified if appropriate for a particular region/location. This technique may be adapted
or modified to monitor riverine, coastal, and offshore locations.
3.2.2 Sample Number and Frequency
In addition to standardizing the technique and equipment used, it is equally important to
complete enough sampling to account for heterogeneity in debris concentration (e.g., Pichel et
al., 2007). Depending on study objectives, detecting significant trends or making regional
comparisons may require an infeasible sample size (Ryan et al., 2009, Versar, Inc., 2012). It may
be advantageous to conduct surveys initially more frequently to understand the spread of the data
and factors affecting variability (MSFD, 2013). To increase confidence in debris concentration
estimates, balance spatial distribution of sampling and the number of floating debris transects
within a location with the amount of replication required at the shoreline site level (Versar, Inc.,
2012).
Once location is determined, at least ten transects are identified, plotted in mapping software,
and randomly numbered. Three numbers are selected from a random number table to determine
which transects are evaluated on a sampling event. At least three transects should be completed
within two nautical miles parallel to the adjacent shoreline site and within one nautical mile
perpendicular to the shore (Figure 5). We suggest surveyors pair the surface water sampling
frequency with adjacent shoreline assessments. And, where possible, groups are encouraged to
conduct surveys in conjunction with ongoing marine research and/or water quality assessments.
21
Figure 5. Shoreline and pelagic sampling should be coordinated so that the pelagic trawl transects occur within two
nautical miles of the shoreline assessment sites (here, denoted as a single 100 m section of beach). Three trawls,
each approximately 0.5 nm, will be conducted at each site. Red circles represent points at which to note GPS
coordinates. If obstructions are present, it is necessary to take GPS coordinates whenever the vessel changes heading
and not only at the beginning and end of each trawl transect.
3.3 Equipment
The following equipment is suggested to perform surface trawls for floating marine debris:
Nautical charts
Digital camera
Hand-held GPS unit
Extra batteries (suggest rechargeable batteries)
Manta net
Detachable cod end (+ one spare)
Bridle for manta net
Weights to attach to frame, if in offshore or choppy waters
Flowmeter
Stopwatch
22
Squirt bottles
Plastic buckets with handles (two 5-gallon)
Stainless steel sieves (5-mm and 0.30-mm mesh)
Calipers
First aid kit (including sunscreen, bug spray, drinking water)
Work gloves for hauling the net
Latex gloves (or appropriate alternative) for handling the sample
Stainless steel forceps, 6-inch, angled tip, for picking out larger debris items
32-ounce (~1 L) amber glass sample bottles with lids
Wide-mouth funnel (stainless steel) to fit glass bottles
Clipboards
Data sheets (on waterproof paper)
Waterproof labels for jars, pre-labeled and affixed to jars prior to trawls
Pencils
Permanent markers
White trays, 12-inches square (or equivalent) for sorting debris
Stainless steel spatula, ~8-inches in length, with tapered and rounded ends for sorting
debris
Sealant to repair net holes
Bags for large debris items
Instrument to measure water quality parameters (optional)
3.4 Pre-Survey Site Characterization
Before completing floating debris surveys, shoreline characterization is completed for each 100
m site. See Section 2.0 of this document for the methodology.
For surveys of coastal waters adjacent to shoreline sites, current bathymetric maps should be
obtained for the area within two nautical miles of the chosen shoreline site. Several potential
sites for trawls are chosen based on ease of access and strata described in the survey design
section. It is ideal to complete a survey of the surrounding surface waters before any sampling
begins. For studies with concurrent shoreline surveys, any pertinent information on hydrography,
bathymetry, and in-water barriers is also described in the “notes” section of the shoreline
characterization data sheet.
Select transects prior to arrival at the site. Each data sheet captures ancillary data and data
pertaining to a single trawl event. Ancillary data may be recorded before arrival at the site.
Each trawl transect has a unique identification in this suggested format:
Site ID_year-month-day_transect #
An example is [MD-MR_2010-01-07_T1] for a trawl completed in Maryland’s Middle River on
January 7, 2010 along the first transect (identified as T1 in mapping software).
23
3.5 Surface Water Trawl Survey Methodology (> 0.30 mm)
3.5.1 Trawling technique
Figure 6. In-water setup for a manta tow. The vessel shown has an A-frame at the stern that is fully depressed,
which supports a tow rope that is cleated to achieve and angle of ~20° between the vessel and the net to minimize
interaction with the vessel’s wake. The shorter side of the bridle should be closer to the vessel to help facilitate
avoidance of sampling the wake.
All transects follow the same trawling technique. A manta net, with a body composed of 0.330
mm nylon mesh and measuring approximately 3 m in length, is towed horizontally at the surface
(Figure 6). Depending on sea state, weights are added to the bridle to ensure balanced
positioning and coverage of the surface waters. Alternately, weights may be added to a tow line
that connects the bridle to the winch line. A swivel connects the tow rope to the manta net bridle,
which is offset so that one side is slightly longer to encourage a towing angle that samples waters
outside of the vessel’s wake. A buoy is attached to the net for safety and retrieval purposes.
A digital or analog flowmeter is attached to the net frame and suspended in the center of the net
mouth. An initial flowmeter reading is taken prior to deployment of the net apparatus; this
24
reading should not change before placement in the water. The net is deployed from the back or
the side of the vessel, with enough slack to allow the net to smoothly skim the surface of the
water and avoid the vessel’s wake. The side paravanes of the manta net should be on the water’s
surface. An angle of approximately 20 degrees between the line of the vessel and the net is
desirable for minimizing interaction with the vessel wake. The shorter side of the bridle should
be closer to the vessel to obtain the required towing angle (Figure 6).
The trawl is deployed for approximately 0.5 nautical miles at a speed of 1-3 knots, an
approximately 15 minute duration. When noting the in-water time, include time for deployment
and retraction when the net is submerged in the water and the flowmeter is recording volume.
During the trawl, vessel speed and tow rope length may be adjusted to ensure the net is properly
skimming the surface away from the vessel wake. One person watches the net and notes any
large debris items that may be initially funneled into the net mouth. These should be detailed on
a large debris data sheet.
GPS coordinates are recorded in degree decimal format at the beginning and ending point of
each trawl transect. This can be done with a handheld GPS unit or by marking coordinates of the
vessel’s transect path in mapping software. If obstructions are present in the area and require
alteration of the original transect, GPS coordinates should be recorded when the vessel changes
heading (Figure 5).
3.5.2 Sample Processing
The flowmeter reading is recorded as soon as the net is recovered. Contents of the net are gently
washed with natural seawater from the outside, into the cod end. If possible, ambient seawater is
filtered through a 0.333 mm mesh sieve to remove particles that could bias the sample. The cod
end is detached and its entire contents are rinsed with seawater. Digital photos document the
process throughout, especially the cod end contents at the end of each trawl.
Samples may be processed on the vessel or transferred to labeled sample jars for laboratory
processing. Any obvious large debris items, >30 cm, are counted on a separate large debris data
sheet, rinsed to collect any small attached particles, photographed, and then stored in bags or
discarded appropriately. Large natural items can be discarded but should be rinsed to collect any
small attached particles; items may be recorded on the data sheet and photographed depending
on study objectives.
When processing samples on the vessel, the remaining sample from the cod end is rinsed into
stacked stainless steel sieves (5 mm and 0.333 mm) to separate debris items into two size
fractions, (x > 5 mm) and (5 mm > x > 0.333 mm). Proper rinsing with squirt bottles filled with
ambient seawater is essential to collect all natural and anthropogenic particles that may be
attached to debris items and natural contents (e.g., floating leaves, woody stems, pine needles,
jellyfish). Rinsing is important if samples will be analyzed for microplastic concentration; in that
case, the study design may consider using deionized water for rinsing to decrease potential bias.
Debris items larger than 5 mm are sorted by material category and tallied on debris data sheets.
Macro-debris may then be discarded appropriately or archived depending on study objectives.
25
The size fraction smaller than 5 mm, composed of micro-debris, is carefully rinsed into glass
sample bottles and stored frozen to prevent any sample degradation.
If samples are not processed on the vessel, steps are taken to condense the sample by minimizing
rinsing and cataloging any large debris items. Large items are processed as described above and
removed from the sample. Trawl contents are rinsed into glass sample jars for sieving in the
laboratory, following the sieving technique described above. Samples are processed as soon as
possible to avoid the need for initial freezing or chemical preservation.
Analytical methods are available for processing water, sediment, and sand samples to quantify
microplastic debris (Baker et al., 2013). When applicable, archiving frozen samples for further
analyses is suggested.
3.6 Data analysis
Volume of water filtered during each trawl is calculated based on the flowmeter used. In general,
distance is calculated per trawl by subtracting the initial and final readings of the flowmeter and
applying a correction factor specific to the flowmeter. Distance is then multiplied by the area of
the net mouth to determine a volume of water filtered. The concentration (#items/m3) of macrodebris items is calculated as follows:
C = concentration of debris items (# of debris items/m3)
n = # of debris items observed
V= volume of water filtered (m3) = [(net mouth width) × (net mouth height) × d ]
d = distance traveled = (flowmeter final – flowmeter initial) × correction factor
For a given sampling event:
1. Calculate debris concentrations for each individual transect surveyed (a minimum of
three per survey) using the equation above
2. Take the mean of the three concentrations to calculate an overall site concentration (with
a standard deviation) for that date
3.7 Quality Control
Quality control procedures increase the efficiency, accuracy, and precision of floating debris
assessments. Safety and data management plans should be in place before sampling begins. For
accuracy in positioning of trawl transects, develop a survey design before sampling begins and
use a GIS to label all potential transects. Naming conventions should be standardized for
notation on sample labels and data sheets.
26
Consistently following a standardized procedure is essential. Trawling and processing techniques
should be monitored for consistency. During trawling, watch the manta net to ensure that it is
properly skimming the water’s surface without creating excessive splashing of water in the net
mouth that influences water sampling. If the manta net is not skimming properly, vessel speed
(or other parameters) should be tweaked to provide appropriate positioning and water flow
through the net. Debris counts should be confirmed by two individuals if possible; at least 20%
samples should be analyzed separately by two people for quality assurance. Debris samples
should be saved for additional testing if material type is not determined. For studies investigating
micro-debris, rinsing standards are important and the suggestions listed here may be appended
with additional controls such as using deionized or filtered water for rinsing, and conducting all
rinsing within a controlled laboratory environment. Sieves and equipment should be thoroughly
rinsed between trawl events. All instruments should be calibrated and cleaned regularly.
Equipment and rigging should be cleaned and inspected after each sampling event.
3.8 Considerations
Assessing floating debris quantity and composition presents challenges and confounding factors.
The recommended technique for floating debris surveys is meant to be robust to slight
modifications depending on study objectives, and this has been noted in the text. This section
presents additional considerations for employing the floating debris survey technique.
3.8.1 Survey design
As discussed in Section 1.2, debris sources and points of input are often impossible to determine.
Several categories have been identified, including (1) larger pieces from land-based runoff or
actual release; (2) larger pieces from ocean-based dumping or accidental release; (3) smaller
pieces that result from the degradation of larger marine debris in the environment; and (4) small
debris, for example, micro- and nano-plastics used in consumer products (e.g., plastic beads used
as an exfoliant in soaps) that enter the waste stream from regular use and are likely discharged
with wastewater (Fendall and Sewell 2009). Programs that seek to understand the source of
debris should heavily consider survey design in terms of both selecting appropriate sites to
monitor and adding enough replication to constrain the variability in debris concentrations
attributed to environmental conditions.
Local weather, runoff, other potential point sources of debris, and oceanographic conditions will
be important to consider in the study design. Where possible, groups are encouraged to conduct
surveys in conjunction with ongoing marine research and/or water quality assessments. This may
necessitate adjustment to the suggested study design, but more important is standardizing the
techniques used to collect and process the floating debris samples, as well as the metrics used to
report debris concentrations.
3.8.2 Technique
27
Note that, as a general rule, faster tow speeds and larger mesh sizes will exclude smaller particles
and will bias the sample toward larger particles. The techniques recommended here provide an
overview of the amount and type of debris present in surface waters at a given location, but due
to operational constraints will not sample the entire water column or obtain all debris. Particles
smaller than 0.33 mm (the suggested mesh size) will escape during trawling. Trawl transect
lengths may be optimized based on local conditions. For example, during a phytoplankton bloom
the mesh may become clogged and will not filter effectively. Techniques that diverge from the
standard transect length or standard tow speed are especially encouraged to measure flow
volume per trawl, in order to account for varying flow volumes in calculated concentrations.
Depending on study objectives, samples may be processed in a clean laboratory environment
with slight changes to sieving technique such as a more thorough washing with deionized water,
a more detailed sorting based on additional size classes (e.g., additional sieving through a 1-mm
screen), drying the total sample, and weighing debris items. All visible debris items may be
measured with calipers.
If study objectives involve correlating debris loads and water quality, parameters such as
dissolved oxygen, pH, temperature, etc. should be recorded at the beginning and end of each
transect.
3.8.3 Data analysis
The reporting unit is extremely important when making comparison to other comparable studies.
For macro-debris, count (debris pieces) per volume (water filtered) provides an accurate
measurement. This is a departure from most historic and present-day conventions, but is
commonly used in marine plankton studies, is fairly simple to obtain, and allows for comparison
of macro-debris concentrations in other matrices such as sand and sediments. Volumetric
measures of surface water debris are useful because debris, especially plastic debris, can be
neutrally buoyant and exist at depth in the water column due to wind-driven mixing (Kukulka et
al., 2012). In the future, it may be possible to use measurements of floating marine debris to
integrate a measurement through the water column; and thus providing an estimate for the
amount of water filtered in each trawl would enhance parameterization.
In some cases it may be useful to obtain mass measurements to estimate debris density within a
given parcel of water (g/m3). This measurement is informative for macro-debris, but is especially
important for micro-debris particles that may not be easily counted. In addition, density estimates
of micro-debris may be compared to density estimates of natural material in a given size class
which provides an easily understood ratio of debris to the naturally occurring particles. Density
is easily compared to whole water samples, benthic sediment grabs, and plankton abundance
measurements that may be obtained in the same study. For very small particles (<1 mm), mass
measurements will likely be more accurate than count.
3.8.4 Relevance
28
Given the high variability in floating debris concentration, it may not be cost-effective to conduct
enough sampling to accurately compare locations or regions, or to understand which
environmental variables most influence debris concentration (Versar, Inc., 2012). To address this
reality and strive for relevance with these techniques, this document stresses the benefits of
completing floating marine debris surveys in conjunction with ongoing marine research and/or
water quality surveys for increased efficiency in data collection. In addition, these techniques
sample both macro- and micro-debris. Particles smaller than 5 mm have been documented in
many water samples that did not contain macro-debris. Understanding the factors that affect the
size distribution and particle concentration of debris in the ocean is important to advance the
state of the science regarding debris movement, distribution, and degradation. These floating
debris assessment techniques may be applied to address additional research questions beyond
those posed at the beginning of this section.
29
4.0 AT-SEA VISUAL SURVEY METHODS
4.1 Background
Ship-based visual surveys are a relatively easy, cost-effective method for crowd-sourcing open
ocean marine debris sightings (i.e., from vessels of opportunity) and can provide useful
information on the types of debris commonly encountered and spatial and temporal variability of
floating debris. The accuracy of reports generated from ship-based debris sightings is affected by
environmental factors (e.g., weather conditions, sea state) and variation between observers (Ryan
et al., 2009) and vessel size and speed (Rees and Pond, 1995). On larger vessels, observers are
typically situated higher above the water surface and farther from the bow (e.g., on the bridge),
which causes items very close to the bow to go undetected (Thiel et al., 2011). To account for the
likelihood of surveyors missing some debris items located on a transect (Ryan 2013) apply a
correction factor to measured debris counts based on item size and distance. Line transect
sampling methods (where the perpendicular distance to each item is recorded) may reduce bias
(Burnham and Anderson, 1984), but is not recommended for novice observers. It is important to
recognize that although the majority of debris floating on the ocean surface is from the smaller
size fractions (e.g., Law et al., 2010, Doyle et al. 2011, van Cauwenberghe et al., 2013), visual
sightings will be skewed toward larger debris items. Further, unlike surface water trawls which
will capture debris just beneath the surface (i.e., debris that has been subjected to wind mixing),
visual surveys will only account for debris that is visible at the surface. Visual survey data
should be interpreted as a low-end estimate of the total concentration of floating debris.
A number of confounding factors must be taken into consideration for accurate comparisons of
floating debris concentrations across time and space. Similar to marine debris in other
environmental compartments, there is a lot of variability and patchiness in the abundance of
floating debris. Large-scale convergence zones (e.g., the North Pacific High Pressure Zone), as
well as small and meso-scale circulation features, may concentrate floating debris and create
ephemeral debris patches. Areas of concentrated debris (which often also include natural debris)
can be difficult to quantify from a moving vessel. One data analysis technique is to pool
sightings from very long transects to account for debris patches (e.g., Ryan 2013 used 50 km
transect lengths).
Quantitative comparisons of different visual survey efforts noted in the literature are difficult to
make due to the differences in reporting units (e.g., #items/km or #items/km2), minimum debris
size (studies have varied from 1.5 – 10 cm (Section 7.1)), and transect width (up to 100 m; e.g.,
Morris, 1980, Shiomoto and Kameda, 2005). Relative to debris classification systems used for
other types of marine debris monitoring, a simplified data sheet should be used for visual surveys
as it is difficult to collect detailed and accurate information on debris types from a ship-based
observer. Thus, the visual survey data sheet provided in Section 7.5 does not cover the same
level of detail as data sheets for shoreline sampling and surface water trawls. Given the
uncertainty in detection and patchiness of large debris items, data collected through visual
surveys may be most useful for qualitative assessments of the types and relative abundances of
floating debris.
30
4.2 Survey Design
Cheshire et al. (2009) provides methods for setting up a prescribed visual survey pattern in a
given area and also for transect sampling. Given the widely variable debris concentrations noted
by published reports, it is difficult to provide strict recommendations about survey design.
Survey design should consider the suggestions put forth in the surface water trawl technique
(Section 3.2), while tailoring the study to address specific questions about floating marine debris.
Visual surveys may complement surface water trawl surveys and shoreline surveys. A survey
design that includes visual surveys of floating debris conducted in conjunction with other survey
types will lead to a more robust data set. Where possible, groups are encouraged to conduct
surveys in conjunction with ongoing marine research and/or water quality assessments. This may
include vessels of opportunity as well as structured studies that monitor at standard intervals.
When vessels of opportunity are used as the platform for visual debris surveys, a structured study
design is unlikely. This must be stated when data and results are reported (Ribic et al., 1992).
4.3 Equipment
The following equipment is suggested to perform visual surveys of floating marine debris:
Clipboard
Pencil
Survey forms printed on waterproof paper
GPS unit
Binoculars
Digital camera
4.4 At-Sea Visual Survey Technique
Visual surveys should be conducted along strip transects at least 0.5 nm in length. Ancillary data,
including environmental conditions and GPS locations of transect beginning and end points
should be recorded on the visual survey form (Section 7.5). Any changes in heading during
individual transects should be recorded in the space provided. If possible, two surveyors should
conduct surveys from the bow of the vessel, and data from the port and starboard sides can be
pooled from two separate data sheets. If only one surveyor is available, the surveyor may want to
conduct the survey from the glare-free side of the vessel (Ribic et al., 1992). Each surveyor is
responsible for visually scanning the sea surface and recording all debris > 2.5 cm that passes
either the port or starboard side of the vessel (Figure 7). MSFD (2013) recommends that visual
surveys not be conducted when environmental conditions are such that this minimum debris size
cannot be detected, and provides suggested transect widths (ranging from 3 to 15 meters) based
on vessel speed and height of the observer above the water (reproduced in Table 2). It is
important to note that these suggested transect widths need to undergo further testing, and should
be used only as a starting point. Binoculars may be used to verify the identity of items.
31
Observer height
above water
1m
3m
6m
10 m
2 knots
6m
8m
10 m
15 m
Ship Speed
6 knots
4m
6m
8m
10 m
10 knots
3m
4m
6m
5m
Table 2. Suggested visual survey transect widths based on observer height above water and ship speed. Adapted
from MSFD (2013). Note that these suggestions are preliminary and will be further reviewed by the MSFD.
Figure 7. During visual surveys, observers are responsible for visually scanning the sea surface on either the port or
starboard side of the vessel, within a defined transect width.
Visual survey data should be reported in terms of # items/km2, based on the transect width and
length (determined from latitude and longitude of transect start and end points). To get an
understanding of variability in detection from different observers, quality control surveys should
be conducted on 20% of survey transects, by a second visual observer on the same side of the
32
vessel. Quality control surveys should be distributed among different sampling events and
include consideration of debris classification and total count.
4.5 Considerations
As discussed above, ship-based debris observations can provide useful information on the
abundances and types of debris floating at the sea surface. However, given the patchiness of
surface water debris and uncertainty in debris classification during visual surveys, researchers
must give careful consideration to survey design and standardization between observers and
platforms in order to develop robust estimates of floating debris concentrations.
33
5.0 BENTHIC METHODS
The information provided in this section is intended to guide development of benthic surveys to
ensure that data and results can be integrated with surveys in other environmental compartments.
Integration and standardization of survey efforts between shorelines, surface waters, and the
benthos is important to understand and model the life cycle and behavior of debris. We suggest
that groups interested in developing a benthic survey program follow the guidelines below and
refer to more detailed protocols provided by the MSFD (MSFD, 2013).
5.1 Background
Historical methods for detection and survey of benthic debris vary according to vessel
capabilities and available equipment, target debris type and size, location, personnel (e.g.,
availability, skill level, training, technical abilities), and environmental conditions (e.g., depth,
water clarity, current strength). Benthic monitoring efforts are often cost-prohibitive and more
logistically challenging than some other types of marine debris monitoring (namely, shoreline
monitoring), and there is often a lot of spatial variability in benthic debris concentrations.
However, the seafloor is recognized as a potentially significant debris sink that should not be
ignored.
MSFD (2013) provides suggested methods based on depth, divided between shallow (< 20 m;
SCUBA), shelf (up to 800 m; trawls), and deep sea floor environments; the sections that follow
provide a general overview of the MSFD (2013) suggested approach. It is recognized that there
is no single technique that will work across survey efforts in diverse environments and with
different objectives and available resources. The guidelines presented here should be used as a
guiding framework during the planning process, during which operation-specific protocols and
safety measures will be developed.
Benthic debris items should be catalogued according to the same classification system used for
other environmental compartments. That is, debris should be tallied according to the material
types and item categories captured on shoreline and surface water data sheets (Section 7.5).
Further, to ensure comparability with data collected on shorelines and in surface waters, the
focus should be on debris abundance (count and concentration) rather than weight. However,
from a management perspective it might be informative and efficient to concurrently collect
volume, size, and/or weight estimates. In instances where debris is not collected during surveys,
there will be a lower degree of confidence in accurate item classification (e.g., diver or
submersible surveys). A list of the benthic marine debris survey literature reviewed is provided
in Section 7.1. Side scan sonar is not considered here given that it is only feasible for detection of
large debris items, for example derelict crab pots (Stevens et al., 2000; Morison and Murphy,
2009).
Although assessment of micro-debris (< 5 mm) is not a focus of this document, it is worth noting
that concurrent sampling of this small size fraction during macro-debris assessment requires the
use of sediment grabs or trawls with a fine mesh size (e.g., Cole et al., 2011).
34
5.2 Survey Design
5.2.1 Site Selection
Survey locations are dependent on accessibility, study objectives, and available resources and
equipment. Sensitive habitats or species and underwater hazards should be avoided. This
includes sites that may contain unexploded ordinance or have features that may pose an
entanglement hazard to divers or gear. Given the patchiness of benthic debris, sampling should
focus on areas where debris is suspected to accumulate and may be stratified by factors such as
land use, proximity to river mouths, substrate, tourism, fishing pressure, or oceanic current
patterns. Bathymetry and hydrodynamics should be considered during site selection as there is
growing evidence of their influence on benthic debris accumulations (e.g., Galgani et al. 1996;
Keller et al. 2010). Acha et al. (2003) show that salinity fronts associated with river mouths tend
to trap debris and may be common accumulation areas.
5.2.2 Sample Frequency
Survey frequency for benthic debris assessments should be determined based on study
objectives, available resources, and expected seasonal or annual variability. In the Bay of Biscay
(France), Galgani et al (1995a) found a greater abundance and more spatial variability in benthic
debris trawls during the winter / early spring compared to other times of the year when debris
concentrations were more uniform. The authors suggest that this variation may be due to
seasonal changes in coastal currents and water levels. Quarterly or biannual sampling may be
appropriate in regions that exhibit less seasonality (e.g., tropical regions with wet / dry seasons)
and sampling may be further restricted by weather conditions and accessibility in high latitude
areas.
5.3 Shallow Environments (< 20 m)
Based on proximity to source, shallow nearshore regions are more likely to accumulate seafloor
debris. In areas where there are strong bottom currents or intense storm activity, debris may be
pushed farther out on the continental shelf, accumulate around rocky ledges or outcrops, or be
deposited in offshore canyons or other depressions (e.g., Galgani et al., 1996, Bauer et al., 2008,
Kendall et al., 2007, Wei et al., 2012, Schlining et al., 2013).
Dive surveys along line or strip transects are often the preferred method for assessment of
seafloor debris in shallow or coastal environments. The ability to detect debris is a significant
concern during underwater visual surveys, and the dimensions of each sampling unit (e.g.,
transect length and width) should be based on estimated debris concentration, detectability, and
environmental conditions. Diver experience may also affect the degree of detection (Ribic et al.,
1992). MSFD (2013) provides a range of transect lengths (20 – 200 m) and widths (4 – 8 m)
based on environmental conditions and debris concentration (based on Katsanevakis, 2009; see
35
Table 3). In order to double the areal coverage of surveys, the UNEP survey technique employs a
pair of divers, one on each side of the transect line (Cheshire et al., 2009). Further, MSFD
recommends the use of a distance sampling method, where divers record the distance of each
debris item from the line so that a degree of detectability can be applied during debris
concentration calculations. A minimum debris size must be identified prior to any survey
activities. The minimum debris size should be based on study objectives but should not be
smaller than the lower limit of detection (Donohue et al., 2001, Timmers and Kistner, 2005);
ideally all items > 2.5 cm are detectable. Selecting a smaller minimum debris size cut-off will
require more time and resources. Results of dive transect surveys are expressed in terms of
#items/m2.
Debris
Density
0.1 – 1 items / m2
0.1 – 1 items / m2
0.01 – 0.1 items / m2
< 0.01 items / m2
Environmental
Conditions
Low turbidity & high habitat complexity
High turbidity
In every case
In every case
Sampling Unit
(length x width)
20 m x 4 m
20 m x 4 m
100 m x 8 m
200 m x 8 m
Table 3. Suggested dive survey transect lengths and widths based on environmental conditions and debris
concentration. Adapted from MSFD (2013) and Katsanevakis (2009).
To ensure that all of the appropriately sized debris items within a transect are recorded, quality
control estimates should be conducted by a second surveyor on 20% of the total number of
transects sampled per site over the course of the study. Quality assurance sampling should be
distributed among different sampling events and include consideration of debris classification.
Both SCUBA and snorkel free-dive techniques have been used for shallow water benthic debris
assessments (e.g., Donohue et al., 2001, Bauer et al., 2008; see Section 7.1). Existing biological
monitoring programs that employ diver surveys may provide an opportunity for collaboration.
Debris surveys would be more economical and efficient if combined with existing benthic
ecology or other monitoring efforts.
For any diving activities or other use of compressed gas as a breathing medium (e.g., surface
supplied air), safety is the number one priority and divers must be trained to a level
commensurate with the type and conditions of the diving activity being undertaken. Project leads
are responsible for understanding all aspects of dive safety regulations and required trainings
(e.g., OSHA distinctions between scientific and commercial diving) and must ensure that their
organization has the capacity to oversee all planned diving activities (e.g., appropriate insurance,
safety policies, etc.).
5.4 Continental Shelves (up to 800 m)
In locations where it is too deep for dive surveys, debris assessments can be combined with
ongoing trawl surveys, for example benthic ecology studies or fish stock assessments (e.g.,
Keller et al., 2010). Although debris loads are likely underestimated with trawls, not all debris is
36
captured and debris may be lost while the net is returned to the vessel; (Spengler and Costa,
2008), trawl surveys can provide an idea of the relative types and abundances of benthic marine
debris, which is informative at a local or regional level. It should be noted that trawling activities
are largely limited to smooth and flat areas of the seafloor, which are not indicative of typical
debris accumulation areas (Galgani et al., 1995a). Ribic et al. (1992) point out that variability in
the vessel, crew, net type (including footrope), depth sampled, and weather will affect the
accuracy of measurements.
UNEP (Cheshire et al., 2009) provides a benthic trawl survey design. The suggested approach is
to select a 5 km by 5 km survey area, create a grid of 25 km2, randomly select three sub-blocks
of 1 km2, and conduct five parallel trawls of 800 m each within each selected sub-block. Trawls
should be separated by at least 200 m and data from all transects should be aggregated to report
an overall debris concentration. Trawl equipment should have a fixed mouth width (e.g., otter
trawls) such that debris concentrations can be reported in units of #items/km2 based on the
distance trawled.
To ensure that all of the appropriately sized debris items within a sample are recorded, quality
control assessments should be conducted by a second individual on 20% of the total number of
samples per site over the course of the study. Quality assurance sampling should be distributed
among different sampling events and include consideration of debris classification.
It is important to consider the impacts of any trawling activity on benthic ecosystems, and
sensitive or protected habitats and species should be avoided. Marine debris trawl surveys are
more affordable and less destructive if combined with existing sampling programs. Van
Cauwenberghe et al. (2013) applied the UNEP trawl survey design on the Belgian continental
shelf and argue that the trawls were an inefficient use of time and resources.
5.5 Deep Sea Floor
There is a paucity of data available on debris in the deep sea, particularly in areas where trawling
is not a viable option. Debris is expected to accumulate in relatively calm areas with high
sedimentation rates, and studies have shown that debris tends to accumulate near outcrops and in
offshore canyons or channels (e.g., Galgani et al., 1996, Kendall et al. 2007, Wei et al., 2012,
Schlining et al. 2013). In regions of the seafloor with varying topography (e.g., outcrops,
canyons, steep slopes), submersibles are the only viable option for marine debris surveys.
Remotely operated vehicles (ROVs) and manned submersibles have previously been used for
debris surveys (Section 7.1), but are restrictively expensive in many cases. Detectability is a
significant concern for surveys that employ submersibles, and in some cases the vehicle may
purposely avoid debris due to entanglement hazards. Further, the color, size, shape, fouling, and
degree of burial in sediments will affect detectability (Ribic et al., 1992). In Monterey Bay, CA a
22-year archive of ROV video footage was recently analyzed for marine debris sightings
(Schlining et al., 2013). The study added to our understanding of typical accumulation regions
but no estimation of debris concentration was provided.
37
5.6 Considerations
Benthic debris has been shown to inflict negative impacts on marine species and habitats,
particularly corals (e.g., Schleyer and Tomalin, 2000, Bauer et al., 2008, Yoshikawa and Asoh,
2004). Thus, it may be worthwhile to identify relationships between bottom communities and
marine debris in various environments (Bauer et al., 2008). Benthic debris typically has a very
patchy distribution, so surveys may be a necessary first step to prioritize debris cleanup efforts,
but considerable effort is required in order to cover large regions of the seafloor (Galgani et al.,
1996). As mentioned above, although the benthos is likely a significant sink for marine debris,
surveys are often prohibitively expensive and logistically complicated compared to other types of
monitoring.
When designing a study, it is important consider and report the lower size limit for detection,
which will be based on the equipment used, habitat type, and in some cases water clarity. In
addition, information on the depth range over which sampling occurs and total area of seafloor
sampled is important (Spengler and Costa, 2008). Regardless of the benthic survey technique
employed, #items/unit area is the suggested basic reporting unit.
38
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41
Kendall, M. S., L. J. Bauer, et al. (2007). Characterization of the Benthos, Marine Debris and
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distribution of buoyant plastic debris." Geophys. Res. Lett. 39(7): L07601.
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Lattin, G. L., C. J. Moore, et al. (2004). "A comparison of neustonic plastic and zooplankton at
different depths near the southern California shore." Marine Pollution Bulletin 49(4): 291-294.
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42
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French Frigate Shoals, Northwestern Hawaiian Islands Marine National Monument, 1990-2006."
Marine Pollution Bulletin 54 (8): 1162-1169.
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type and abundance of beach litter in Monterey Bay, CA." Marine Pollution Bulletin 71(1–2):
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46
7.0 APPENDICES
47
7.1 Literature Review Tables2
Shoreline survey literature reviewed:
Citation
Alkalay et al. 2006
Cauwenberghe et al 2013
Location
Israel
Belgian shelf and shoreline
Edyvane et al. 2004
Anxious Bay, Australia
Two islands south of
Australia
New South Wales,
Australia
Eriksson et al 2012
Frost & Cullen 1997
Jambeck et al., 2009
Debris concentration/day
Debris concentration, weight,
source
Debris count, source,
entanglement
New Hampshire, USA
Sea of Japan
(Japan & Russia)
Taiwan - southwest coast
Kusui & Noda 2003
Liu et al. 2013
Moore et al., 2001a
Morishige et al. 2007
Oigman-Pszcsol & Creed
2007
Rees & Pond 1995
Ribic et al 2010
General Metrics
Debris count, concentration
Debris concentration, weight
Debris count, weight, source,
and entanglement
Debris count, weight, and source
Debris concentration
Debris concentration, weight,
source
Climate/weather, Debris count
Orange County, California
Northwest Hawaiian Islands
SE Brazil
United Kingdom
Ribic et al 2011
Ribic et al. 1994
Rosevelt et al 2013
Nationwide USA
Caribbean and Gulf of
Mexico
Nationwide
Monterey Bay, California
Sheavly 2007
Thiel et al., 2013
Nationwide USA
North-central Chile
Debris count, concentration
Debris count, source
Debris count, source,
entanglement
Debris count, source,
entanglement
Debris count, source
Debris concentration
Debris count, source,
entanglement
Debris concentration
Visual survey literature reviewed:
Citation
Day et al 1990
Matsumura and
Nasu, 1997
Ryan, 2013
Shiomoto and
Kameda, 2005
Thiel et al 2003
Thiel et al 2011
Location
North Pacific
Transect width
(distance from
ship)
50 m
Metric
items / km2
Japan
Bay of Bengal / Straits of
Malacca (Indian Ocean)
no limit
items / km2
50 m
items / km2
nearshore Japan
SE Pacific (near Chile)
German Bight, North Sea
100 m
10 m
20 - 70 m
items / km2
items / km2
items / km2
2
These publications were reviewed during development of NOAA survey techniques, and do not necessarily
represent an exhaustive literature review.
48
Surface water trawl literature reviewed:
Citation
Carpenter et al.,
1972
Location
coastal North
Atlantic Ocean
Carpenter and
Smith, 1972
Colton et al., 1974
Sargasso Sea
Depth Range
surface to
unspecified
depth
surface
Method
oblique plankton net using
0.33-mesh
Metrics
#/m3
neuston net tows using
0.33-mm mesh at 2 knots
neuston net tows using
0.947-mm mesh at 5 knots
ring net or Sameoto net
tows with 0.50-mesh
#/km2 and g/km2
North Atlantic Ocean
Caribbean
North Pacific Ocean,
Bering Sea, Japan
Sea
North Pacific Ocean
Bering Sea;
California Current
surface
Gilfillan et al., 2009
California Current
surface
Goldstein et al.,
2012
North Pacific Ocean
surface
Lattin et al., 2004
California Current
surface to 5m
Law et al., 2010
North Atlantic
Subtropical Gyre
North Pacific Ocean
surface
coastal North Pacific
Ocean; California
Coastal Current
North Atlantic Ocean
surface
surface
neuston net tows using
0.335-mm mesh at 2 knots
Ogi et al., 1999
coastal Japan
surface
Ryan et al., 2009
Thompson et al.,
2004
review
North Sea; North
Atlantic Ocean
comprehensive
10m
Yamashita and
Tanimura, 2007
North Pacific Ocean;
Kuroshio Current
surface
neuston net tows using 0.31.8 mm mesh at 2 knots
n/a
continuous plankton
recorder using 127mm2
aperture onto 0.280-mm
mesh
manta net tows using 0.33mm mesh at 2 knots
Day et al., 1990
Day and Shaw, 1987
Doyle et al., 2011
Moore et al.,
2001(b)
Moore et al., 2002
Moret-Ferguson et
al., 2010
surface
paper?
surface (10-15
cm) and
subsurface
(California) to
212 m
surface
49
Sameoto neuston net tows
using 0.505-mm mesh at
1.5-2.0 knots; manta net
using 0.505-mm mesh;
subsurface cruises used
Bongo nets with 0.505-mm
mesh
manta net tows using 0.505mm mesh at 0.5-0.75 m/s
ovoid and rectangular
plankton net tows using
0.505-mm mesh at 2 m/s;
manta net tows using 0.333mm mesh at 0.7-1 m/s
neuston net tows (manta)
using 0.333-mm mesh;
bongo net tows using 0.333mm mesh; both at 1.0-2.3
m/s
neuston net tows using
0.335-mm mesh at 2 knots
manta net tows using 0.33mesh at 1 m/s
manta net tows using 0.33mesh at 1 m/s
#/km2 and g/km2
#/km2 and g/km2
#/m3 and mg/m3
#/m3 and mg/m3
#/m3 and mg/m3
#/m3 and g/m3
#/km2
#/km2
#/m3 and g/m3
average count
(#), size (mm),
mass (g), density
(g/mL)
#/km2 and g
n/a
#/m3
#/km2
Benthic survey literature reviewed:
Citation
Depth Range
Method
Metrics
> 10 m
snorkel
items / km2
16 - 20 m
SCUBA
# items / 100 m2
<8m
SCUBA
# items / 100 m2
6 - 23 m
trawl
items / km2
not reported
trawl
items / km2
0 - 100 m
up to 750 m
100 - 1600 m
at least 2200 m
not reported
7 - 675 m
trawl
trawl
trawl
trawl
trawl
trawl
US West Coast
East China Sea and South Sea
of Korea
Ionian Sea, Greece
Gulf of Mexico
offshore Marseille and Nice,
France
55 - 1280 m
trawl
# items / hectare
# items / hectare
# items / hectare
# items / hectare
items / km2
items / km2
items / km2 and
kg / km2
not reported
not reported
359 - 3724 m
50 - 2700 m
Watters et al 2010
European Seas
Monterey Bay and Southern
California
20 - 365 m
trawl
trawl
trawl
manned
submersible
manned
submersible
manned
submersible
Schlining et al 2013
Monterey Bay, CA
25 - 3971 m
ROV
Donohue et al 2001
Bauer et al 2008
Chiappone et al
2004
Acha et al 2003
Cauwenberghe et al
2013
Galgani et al 1995a
Galgani et al 1995b
Galgani et al 1996*
Galgani et al 2000*
Hess et al 1990
June 1990
Keller et al 2010
Lee et al 2006
Stefatos et al 1999
Wei et al. 2012
Galgani et al 1996*
Galgani et al 2000*
Location
Northwestern Hawaiian
Islands
Grey's Reef, South Atlantic
Bight, USA
Florida Keys
Rio del la Plata, South
America
Southern North Sea, Belgium
Seine Bay and Bay of Biscay,
France
Northwestern Mediterranean
Gulf of Lions, France
European Seas
Kodiak Island, AK
Oregon and Bering Sea
40 - 1448 m
* Studies listed twice because they employed more than one survey method.
50
kg / km2
items / km2
# items / hectare
# items / 100 m
# items / km
# items / 100 m
# items
(normalized
debris counts relative
abundance)
7.2 Shoreline Survey Advisory Group
Nir Barnea (NOAA Marine Debris Division)
Jenna Jambeck (University of Georgia)
Shelly Moore (Southern California Coastal Waters Research Project)
Carey Morishige (NOAA Marine Debris Division)
Seba Sheavly (Sheavly Consultants)
Shay Viehman (NOAA Center for Coastal Fisheries and Habitat Research)
Katherine Weiler (Environmental Protection Agency)
51
7.3 Versar, Inc. Executive Summary
The text below is the executive summary of the final report compiled by Versar, Inc. (Versar,
Inc., 2012) based on comprehensive testing of the shoreline and surface water survey techniques
presented in this document. The complete report can be accessed at
www.clearinghouse.marinedebris.noaa.gov.
Developing standardized protocols to quantify marine debris is critical for the protection of
natural resources and for evaluating debris removal programs and policies designed to reduce
marine debris. The National Oceanic and Atmospheric Administration (NOAA) Marine
Debris Division (MDD) developed a suite of sampling protocols to quantify marine debris on
coastal shoreline habitats and in nearshore pelagic surface waters. We developed a large scale
pilot project to test the ability of the protocols to quantify marine debris, monitor changes in
debris density, and assess factors correlated with changes in debris density on short and longterm timescales. The overall goal of the pilot project was to provide feedback to the MDD on
the level of sampling effort required to implement the protocols in a larger assessment
program. Two sampling regions representing urban and rural land use in the coastal zone of
the mid-Atlantic Bight were chosen to conduct the pilot project. Within the urban and rural
regions, three locations consisting of three sampling sites each were sampled for marine
debris along the shoreline and in the ocean using visual shoreline transect surveys and pelagic
net sampling methods designed by the MDD. Each region was sampled bi-weekly from June
27th to December 08th, 2011 for a total of 12 sampling events per region over the 24 week
survey.
MDD sampling protocols were successfully employed to sample debris and make estimates
of debris densities. Debris was more common in the shoreline compared to the pelagic
portion of the survey for each size class of debris. Plastic was the most common form of
debris observed. Shoreline macrodebris varied over time and at each level of spatial
resolution except for the region level. The urban and rural region had similar debris densities.
Differences among shoreline locations were best explained by the sampling event on which
the location was sampled, the number of people per site, and the total debris density.
Shoreline macrodebris was weakly correlated with densities of people and the week of
sampling. Both debris density and the number of people decreased over the course of the
survey. Relative standard errors for shoreline macrodebris at the region, location, and site
levels indicate that reasonably precise estimates were made (RSE<=30% in most instances).
Pelagic macrodebris varied among locations but was similar between regions, among
transects, and over time. Pelagic macrodebris was positively correlated with surface water
temperature. Differences among pelagic locations were best explained by the sampling event
during which the location was sampled and the surface water temperature. Relative standard
errors for pelagic macrodebris at each spatial resolution indicate that estimates are imprecise
due to high spatial and temporal variability of debris in the water. Sample size analyses
indicate that sample size would have to increase exorbitantly to distinguish urban from rural
due to the high degree of similarity between regions. Overall we found the sampling
protocols employed in this survey are consistent and repeatable and based on our assessment
would have the flexibility to serve as a guide for standardized methods for quantifying
marine debris in small or large scale marine debris monitoring and assessment surveys. To
further enhance these sampling protocols and future surveys we recommend (1) that a critical
evaluation be conducted to determine the value of comparing differences in marine debris
52
between land use types, (2) additional protocol testing be conducted in other shoreline habitat
types, (3) readily available GIS and location specific data from U.S. regions be identified and
compiled into a comprehensive GIS, and (4) that shoreline sampling continue in the location
of the current pilot survey using a stratified random sampling rather than fixed sampling
approach.
53
7.4 Random Number Tables
1
2
3
4
Transect Selection Random Number Table
1
2
3
4
4
8
17
9
7
19
2
12
18
14
6
16
3
5
15
10
5
1
20
11
13
1
2
3
4
Micro-Debris Random Number Table
1
2
3
4
6
2
14
17
8
10
13
5
16
18
15
4
1
3
20
12
5
19
9
7
11
5m
Each column represents 1m of transect width. Rows represent zones of a
shoreline section.
white = above the wrack line (closer to the first barrier)
light gray = at the wrack line
dark gray = below the wrack line (closer to the water)
54
Transect ID # from start of
100 m shoreline section
1
0-5m
0-16'4"
2
5-10m
16'4"- 32'9"
3 10-15m
32'9" - 49'2"
4 15-20m
49'2" - 65'7"
5 20-25m
65'7" - 82'
6 25-30m
82' - 98'5"
7 30-35m
98'5" - 114'9"
8 35-40m 114'9" - 131'2"
9 40-45m 131'2" - 147'7"
10 45-50m
147'7" - 164'
11 50-55m
164' - 180'5"
12 55-60m 180'5" - 196'10"
13 60-65m 196'10" - 213'3"
14 65-70m 213'3" - 229'7"
15 70-75m
229'7" - 246'
16 75-80m
246' - 262'5"
17 80-85m 262'5" - 278'10"
18 85-90m 278'5" - 295'3"
19 90-95m 295'3" - 311'8"
20 95-100m 311'8" - 328'1"
55
7.5 Data sheets
7.5.1 Shoreline data sheets
56
Name of organization responsible
for collecting the data
Name of person responsible for
filling in this sheet
Organization
SHORELINE DEBRIS
Site Characterization Sheet
Standing‐Stock Surveys
Surveyor name
Phone number
Phone contact for surveyor
Complete this form ONCE for
Date
each site location
Date of this survey
SAMPLING AREA
Name or ID by which this section of
shoreline is known (e.g., beach
name, park)
State and county where your site is
located
Shoreline name
State/County
Latitude
Longitude
Recorded as XXX.XXXX (decimal
degrees) at start of shoreline section
(in both corners if width > 6 meters)
Coordinates at start of
shoreline section
Latitude
Coordinates at end of
shoreline section
Photo number/ID
Length of sample area
(usually 100 m)
Shoreline slope (o)
Substratum type
Substrate uniformity
Tidal range
Tidal distance
Back of shoreline
Aspect
Longitude
Recorded as XXX.XXXX (decimal
degrees) at end of shoreline section
(in both corners if width > 6 meters)
The digital identification number(s)
of photos taken of shoreline section
SHORELINE CHARACTERISTICS
Length measured along the
midpoint of the shoreline (in
meters)
Slope above horizontal (between 0 –
90o)
For example, a sandy or gravel
beach
Percent coverage of the primary
substrate type (%)
Max & min vertical tidal range. Use
tide chart (usually in feet).
Horizontal distance (in meters) from
low‐ to high‐tide line. Measure on
beach at low and high tides or
estimate based on wrack lines.
Describe landward limit (e.g.,
vegetation, rock wall, cliff, dunes,
parking lot)
Direction you are facing when you
look out at the water (e.g.,
northeast)
LAND‐USE CHARACTERISTICS
Urban
Select one and indicate major
Location & major usage
Suburban
usage (e.g., recreation, boat
access, remote)
Rural
Vehicular (you can drive to your
Access
site), pedestrian (must walk),
isolated (need a boat or plane)
Nearest town
Name of nearest town
Nearest town distance
Distance to nearest town (miles)
Direction to nearest town
Nearest town direction
(cardinal direction)
If applicable, name of nearest
Nearest river name
river or stream. If blank, assumed
to mean no inputs nearby
Distance to nearest river/stream
Nearest river distance
(km)
Direction to nearest river/stream
Nearest river direction
(cardinal direction from site)
Does nearest river/stream have
River/creek input to
YES
NO
an outlet within this shoreline
beach
section?
Is there a storm drain or
Pipe or drain input
YES
NO
channelized outlet within
shoreline section?
Notes (including description, landmarks, coastal hydrography, offshore barriers, etc.):
Name of organization responsible for
data collection
Name of person responsible for filling in
this sheet
Organization
SHORELINE DEBRIS
Survey Data Sheet
Surveyor name
Phone number
Phone contact for surveyor
Complete this form during Email address
EACH transect
Date
Email contact for surveyor
Date of this survey
ANCILLARY INFORMATION
Shoreline name
Transect # and photo ID
Coordinates of start of
shoreline site
Latitude
Longitude
Coordinates of end of
shoreline site
Latitude
Longitude
Width of beach
Time start/end
Start
End
Recorded as XXX.XXXX (decimal
degrees). Record in both corners if
width > 6 m. If transect, record at back
of shoreline.
Width of beach at time of survey from
water’s edge to back of shoreline
(meters)
Time at the beginning and end of the
survey
Time of the most recent or upcoming
low tide.
Spring, summer, fall, winter, tropical
wet, etc.
Date on which the last survey was
conducted
Describe significant storm activity
within the previous week (date(s), high
winds, etc.)
Time of low tide
Season
Date of last survey
Storm activity
Current weather
Number of persons
Large items
YES
NO
Debris behind back
barrier?
YES
NO
Photo ID #s
Name for section of shoreline (e.g.,
beach name, park)
Transect # (1‐20) and digital photo
number of transect
Recorded as XXX.XXXX (decimal
degrees). Record in both corners if
width > 6 m. If transect, record at
water’s edge.
Describe weather on sampling day,
including wind speed and % cloud
coverage
Number of persons conducting the
survey
Did you note large items in the large
debris section?
Is there debris behind the back barrier
of the site (if yes, do not include it in
tallies below)
The digital identification number(s) of
debris photos taken during this transect.
Notes: Evidence of cleanup, sampling issues, etc.
DEBRIS DATA: (continued on back)
ITEM
Plastic fragments
TALLY (e.g., IIII)
PLASTIC
Hard
Foamed
Food wrappers
Beverage bottles
Other jugs or containers
Bottle or container caps
Cigar tips
Cigarettes
Disposable cigarette lighters
6‐pack rings
Bags
Plastic rope/small net pieces
Buoys & floats
Fishing lures & line
Cups (including
polystyrene/foamed plastic)
Plastic utensils
Straws
Balloons
Personal care products
Other:
METAL
Aluminum/tin cans
Aerosol cans
Metal fragments
Other:
GLASS
Beverage bottles
Jars
Glass fragments
Other:
TOTAL
Film
ITEM
TALLY (e.g., IIII)
TOTAL
RUBBER
Flip‐flops
Gloves
Tires
Rubber fragments
Other:
PROCESSED LUMBER (no natural wood)
Cardboard cartons
Paper and cardboard
Paper bags
Lumber/building material
Other:
CLOTH/FABRIC
Clothing & shoes
Gloves (non‐rubber)
Towels/rags
Rope/net pieces (non‐nylon)
Fabric pieces
Other:
OTHER/UNCLASSIFIABLE
Item type
(vessel, net, etc.)
LARGE DEBRIS ITEMS (> 1 foot or ~ 0.3 m)
Status (sunken, Approximate Approximate
stranded, buried)
width (m)
length (m)
Notes on debris items, description of “Other/unclassifiable” items, etc:
Description /
photo ID #
7.5.2 Trawl data sheets
PELAGIC DEBRIS
Trawl Data Sheet
Surveyor name
Name of organization responsible for data
collection
Name of person responsible for filling in this
sheet
Phone number
Phone contact for surveyor
Organization
Complete this form during Email address
each trawl
Date
Email contact for surveyor
Date of this survey
ANCILLARY INFORMATION
Body of water, location
Name of the water body and the approximate
location of the trawl (sketch map below)
Date of last survey
Current weather
Date on which the last survey was completed
Wind
Cloud cover
Sea state
Describe current weather including wind
speed, % cloud cover, sea state
Storm activity
Describe significant storm activity in previous
week (e.g., date, high winds)
Number of persons
Latitude/longitude start
Number of persons conducting trawl
Latitude
Longitude
Record as XXX.XXXX at start of the sample
transect (decimal degrees)
Latitude
Longitude
Record as XXX.XXXX at end of the sample
transect (decimal degrees)
Time
Start
End
Record as HH:MM. Record when flowmeter
starts / stops turning.
Time (adjusted)
Start
End
Flowmeter
Start
End
Any adjustments to the actual trawl time, in
seconds, based on eployment/recapture of
net.
Flowmeter reading (xxxxxx) before and after
trawl
Latitude/longitude end
Average ship speed
Photo ID #s
Record in knots
The digital identification number(s) of debris
photos taken during this transect.
Map: Space provided below for sketching a map of the site, including important
bathymetric or hydrographic features.
DEBRIS DATA:
ITEM
Plastic fragments
Food wrappers
Beverage bottles
Other jugs or containers
Bottle or container caps
Cigar tips
Cigarettes
Disposable cigarette lighters
6‐pack rings
Bags
Plastic rope/small net pieces
Buoys & floats
Fishing lures & line
Cups (including polystyrene/
foamed plastic)
Plastic utensils
Straws
Balloons
Personal care products
Other:
TALLY (e.g., IIII)
PLASTIC
Hard
Foamed
TOTAL
Film
METAL
Aluminum/tin cans
Aerosol cans
Metal fragments
Other:
Beverage bottles
Jars
Glass fragments
Other:
GLASS
RUBBER
Flip‐flops
Gloves
Tires
Rubber fragments
Other:
PROCESSED LUMBER (no natural wood)
Cardboard cartons
Paper and cardboard
Paper bags
Lumber/building material
Other:
ITEM
TALLY (e.g., IIII)
TOTAL
CLOTH/FABRIC
Clothing & shoes
Gloves (non‐rubber)
Towels/rags
Rope/net pieces (non‐nylon)
Fabric pieces
Other:
OTHER/UNCLASSIFIABLE
LARGE DEBRIS ITEMS (> 1 foot or ~ 0.3 m)
Item type
Approximate Approximate
(e.g., net)
width (m)
length (m)
Material type
(e.g., plastic)
Description /
photo ID #
Notes on debris items, description of “Other/unclassifiable” items, etc:
Sea state: BEAUFORT WIND FORCE SCALE: Specifications and equivalent speeds for use at sea
FORCE EQUIVALENT SPEED
(miles/hr)
(knots)
0
0‐1
0‐1
WAVE DESCRIPTION
(m)
Sea like a mirror
Calm
0
1
1‐3
1‐3
.1
Light Air
Ripples with the appearance of scales are formed, but without foam crests.
2
4‐7
4‐6
.2
Light Breeze
Small wavelets, still short, but more pronounced. Crests have a glassy appearance and do not break.
3
8‐12
7‐10
.6
Gentle Breeze
Large wavelets. Crests begin to break. Foam of glassy appearance. Perhaps scattered white horses.
4
13‐18
11‐16
1
Moderate Breeze Small waves, becoming larger; fairly frequent white horses.
5
19‐24
17‐21
2
Fresh Breeze
6
25‐31
22‐27
3
Strong Breeze
7
32‐38
28‐33
4
Near Gale
8
39‐46
34‐40
5.5
Gale
9
47‐54
41‐47
7
Severe Gale
10
55‐63
48‐55
9
Storm
11
64‐72
56‐63
11.5
Violent Storm
12
73‐83
64‐71
14+
Hurricane
Moderate waves, taking a more pronounced long form; many white horses are formed. Chance of some
spray.
Large waves begin to form; the white foam crests are more extensive everywhere. Probably some spray.
Sea heaps up and white foam from breaking waves begins to be blown in streaks along the direction of
the wind.
Moderately high waves of greater length; edges of crests begin to break into spindrift. The foam is blown
in well‐marked streaks along the direction of the wind.
High waves. Dense streaks of foam along the direction of the wind. Crests of waves begin to topple,
tumble and roll over. Spray may affect visibility.
Very high waves with long over‐hanging crests. The resulting foam, in great patches, is blown in dense
white streaks along the direction of the wind. On the whole the surface of the sea takes on a white
appearance. The 'tumbling' of the sea becomes heavy and shock‐like. Visibility affected.
Exceptionally high waves (small and medium‐size ships might be for a time lost to view behind the
waves). The sea is completely covered with long white patches of foam lying along the direction of the
wind. Everywhere the edges of the wave crests are blown into froth. Visibility affected.
The air is filled with foam and spray. Sea completely white with driving spray; visibility very seriously
affected.
PELAGIC DEBRIS
Large Debris Data Sheet
Completed for large items
collected OR lost (excluded)
from net tows
Organization
Surveyor Name
Name of organization responsible
for collecting the data
Name of person responsible for
filling in this sheet
Phone Number
Phone contact for surveyor
Date
Date of this survey
Body of water,
location
Name by which the body of water is
known
Large Debris Data:
Status
(CAPTURED
in net vs.
EXCLUDED
from net in
ship path)
Item Type
(vessel, net,
etc.)
Trawl
Latitude
(nnn.nnnn
N)
Trawl
#
Trawl
Longitude
(nnn.nnnn
W)
Approximate
Area
Length
(ft)
Width
(ft)
Photo
ID/#
Description
7.5.3 Visual survey data sheets
This data sheet is also available on the NOAA website.
http://www.corporateservices.noaa.gov/~noaaforms/eforms/nf75-103.pdf
67
Shipboard Observation Form for Floating Marine Debris
DIRECTIONS:
1. Determine transect width based on observer height above water and ship speed (see Table)
2. Record ancillary data and start and end lat/long and time.
3. Log debris (> than 2.5 cm) spotted on one side of the vessel (port or starboard) within transect width.
Date: Month/Day/Year
Vessel Name:
Observer Name:
Vessel Speed:
Height of obs. above water (m):
Transect width:
Ship Speed
Observer height
above water
2 knots
6 knots
10 knots
Time (01:00‐24:00 UTC): ___________ Heading: ________°
Transect line START:
Latitude: _______°____.____' N Longitude: _______°____.____' W
Transect line END:
Time (01:00‐24:00 UTC): ___________ Heading: ________°
1 m
6 m
4 m
3 m
Latitude: _______°____.____' N Longitude: _______°____.____' W
3 m
8 m
6 m
4 m
6 m
10 m
8 m
6 m
10 m
15 m
10 m
5 m
Did your heading change between your start and end time?
YES (Note heading changes below)
NO
Heading change #1: Time of change (01:00‐24:00 UTC): ___________ Heading: _____________°
Heading change #2: Time of change (01:00‐24:00 UTC): ___________ Heading: _____________°
Other Plastic Item
Glass Bottle
Other Glass Item
*Describe
(e.g., processed
lumber)
Turtles? (Y or N)
Jellyfish? (Y or N)
Seabirds? (Y or N)
III
0
I
0
I
0
II
0
--
N
N
N
5
10
sunny/
clear
5%
calm
No stops or disruptions;
straight course
File naming:
VesselName_Date_PhotoNumber
Styrofoam
0
Include info on: Any
disruption, stops,
changes in speed, dense
patches of debris, etc.
Did you take any photos?
Jugs/ Buckets
0
Avg sea state
(describe)
Bottles (Beverage)
0
Cloud cover (% of
the overhead sky
covered in clouds)
Bags, Sheeting, Tarp
I
NOTES
Weather (describe)
Plastic Fragment
SPEED / WEATHER / SEA STATE
Avg wind speed
(knots)
Avg boat speed
(knots)
Wildlife
Other
Other Fishing Gear
Glass
Misc. Nets
Plastics
Misc Line
P
Fishing/Boat Gear
Buoys/ Floats
Observations from PORT or
STARBORD side?
Heading change #3: Time of change (01:00‐24:00 UTC): ___________ Heading: _____________°
Y - buoy
7.6 Marine Debris Survey Photo Manual
69
7.7 Frequently Asked Questions for Shoreline Surveys
77
Shoreline Survey Frequently Asked Questions
General
Q: Our volunteers cannot make the regularly scheduled survey. How should we reschedule the
survey?
Q: How many photos should be taken at each survey?
Q: How do I keep track of the date on which photos were taken?
Q: My GPS is giving me lat/longs in the wrong format, how do I change it to decimal degrees?
Shoreline Characterization
Q: If my shoreline is greater than six meters wide, I need to record GPS coordinates at all four
corners of survey site. How do I take GPS coordinates at the water’s edge when waves are washing
in and out?
Q: How do I determine the tidal distance?
Q: My shoreline site is longer than 100 m. How do I select a 100 m segment?
Q: How do I determine the back of the shoreline?
Survey Protocols
Q: I found an item of debris smaller than 2.5 cm in the longest dimension. Why can’t I record it on
the data sheet?
Q: I found an item that could become a large item (> 30 cm) if it became unraveled / unwound. How
should I record it?
Q: Do surveys always need to be conducted at low tide?
Q: Why do we need to measure beach width at every survey?
Q: How do you record the width of the site if the back of the shoreline is not parallel to the water
(e.g., a U-shaped site)?
Q: What should I do if I cannot determine the debris material type?
Q: I found a piece of natural driftwood. Should I record this on the survey sheet?
Q: I found an item that is coated in one material type, and composed of another. How do I record it?
Q: I found multiple pieces of a larger piece of debris. Should I record it as one item or multiple
items?
Q: There is debris beyond the first barrier or change in substrate at the back of the shoreline. Can I
record those items?
Q: What should I do if I find debris fouled with what might be invasive species?
Q: What should I do if I find a piece of hazardous debris?
Q: What should I do if I find a derelict vessel or other large object that may become a hazard to
navigation?
Q: What should I do if I find an item that may be a valuable or significant memento?
Q: I am completing standing-stock surveys. Why do I need to take GPS coordinates of all four
transects at every survey?
Q: I am completing standing-stock surveys, and at multiple surveys I have been encountering the
same item. Should I tally this item at each survey (assuming it is in one of the random transects)?
Data Entry and Submission
Q: How do I get access to the NOAA MD-MAP database?
Q: How often should I upload data to the NOAA MD-MAP database?
78
General
Q: Our volunteers cannot make the regularly scheduled survey. How should we reschedule the
survey?
A: Surveys should be conducted on a regular, every 28 day schedule. If you need to miss a survey it
should be made up within a three day window of the original survey date (i.e., 28 days ± 3 days).
That gives you a seven day window for completing the missed survey.
Q: How many photos should be taken at each survey?
A: Taking a photo of the entire site from the beginning and end points at each survey is a good way
to visually capture changes in shoreline topography and other characteristics that may affect debris
deposition. You may also want to take a photo of each individual transect. In addition, please take
photos of interesting, unidentifiable, or fouled debris (organisms growing on or attached to debris).
Q: How do I keep track of the date on which photos were taken?
A: You should download the photos to your computer following each survey. Change the filename of
the photos to include a date, location, and photo # (e.g., 06-10-2012_LongBeach#01.jpg). You can
also write comments about the photos you’ve taken in the notes section of the data sheet.
Q: My GPS is giving me lat/longs in the wrong format, how do I change it to decimal degrees?
A: The lat/long units can be usually be changed in the general settings of the GPS. There are also
many online tools to convert between units.
Shoreline Characterization
Q: If my shoreline is greater than six meters wide, I need to record GPS coordinates at all four
corners of survey site. How do I take GPS coordinates at the water’s edge when waves are washing
in and out?
A: When you conduct your initial shoreline characterization it is important to arrive at the site at low
tide so that you can capture the entire width of the beach. In order to record GPS readings at the
water’s edge, watch the breaking waves to try to determine the shoreward extent of the water. Record
coordinates at that point. If a portion of the shoreline site is underwater at subsequent surveys do not
try to enter the water to survey. Only survey the exposed area of the shoreline.
Q: How do I determine the tidal distance?
A: Tidal distance is the horizontal distance on the beach between the average low and high tide lines.
Arrive at your site at low tide and measure the distance from the water’s edge to the high tide wrack
line. This measurement is different from the total width of the shoreline, which is measured from the
waters’ edge to the back barrier.
Q: My shoreline site is longer than 100 m. How do I select a 100 m segment?
A: Select your 100 m segment based on areas with relatively low public usage, little evidence of
debris from day use (picnic debris), and areas that are not immediately adjacent to an obstruction to
nearshore circulation (e.g., breakwater, point of land). Also consider landmarks or permanent
features to assist in returning to the same segment at future dates. You may want to consider
randomly selecting multiple 100 m segments within a larger shoreline site.
Q: How do I determine the back of the shoreline?
A: The back of the shoreline is defined here as the first major change in substrate, which may be a
vegetation line, cliff, or other barrier. If you are interested in also monitoring debris that may be
79
pushed back into vegetation behind the beach during storms, that debris should be tallied on a
separate data sheet so that it's not included in the calculated debris standing-stocks. Data entered into
the NOAA database should only reflect the debris to the first change in substrate. If the back of the
shoreline is only a partial barrier, for example a patch of vegetation behind which there is more
beach, then survey up to the first continuous barrier (include that vegetation patch and the area
behind it). In some cases, shoreline sites may be too complex to clearly delineate a maximum
landward limit where debris might be deposited. These types of sites, and shorelines that are very
high energy or dominated by sedimentary deposits, may not be good shoreline survey candidates. For
the same reason, barrier islands and other shifting substrates are not likely to be ideal survey
locations.
Survey Protocols
Q: I found an item of debris smaller than 2.5 cm in the longest dimension. Why can’t I record it on
the data sheet?
A: The 2.5 cm size cutoff (about the size of a bottle cap) is used as a standard metric because it is the
smallest size that can reliably and consistently be detected with the human eye.
Q: I found an item that could become a large item (> 30 cm) if it became unraveled / unwound. How
should I record it?
A: Items should be recorded according to how they’re found at the time of the survey. For example,
if a circular strap or band is found enclosed and is < 30 cm in all dimensions it should be recorded as
a regular-sized item, but if it is opened / detached and is longer than 30 cm, it should be recorded as a
large item.
Q: Do surveys always need to be conducted at low tide?
A: The NOAA protocols ask for surveys to be conducted at low tide so that the entire area where
debris may be deposited is surveyed. However, in some areas where tidal ranges are measured in
10’s of meters, it may not be practical to survey at low tide when large mud flats or wave-cut
platforms are exposed. If it becomes apparent that the vast majority of debris in the intertidal is
ultimately pushed up to the high tide wrack line, surveyors may decide that it is valid to survey at
times outside of the suggested window. However, this decision should be made carefully, backed up
with data, and revisited on a regular basis.
Q: Why do we need to measure beach width at every survey?
A: Knowing the width of the shoreline allows NOAA to report debris densities in units of # of items
per square meter of shoreline. NOAA asks for the shoreline width at each survey in order to evaluate
the variability in shoreline width over the course of the project. Ideally, you could note the shoreline
width at the average lowest tide of the day (tidal height 0’ according to tide tables or graphs), referred
to as Mean Lower Low Water (MLLW, more information available at:
http://tidesandcurrents.noaa.gov/datum_options.html).
Q: How do you record the width of the site if the back of the shoreline is not parallel to the water
(e.g., a U-shaped site)?
A: If the shoreline site is irregularly shaped, you will need to measure the width in a few different
places in order to get an accurate estimate of total shoreline area. Please sketch the shape of the site
in the data sheet notes section. Break the shoreline into a series of rectangles and measure the length
and width of each. This does not need to be done at every survey.
80
Q: What should I do if I cannot determine the debris material type?
A: If you don’t know whether an item is rubber, plastic, metal, etc., record it under “other”, provide a
description, and take photos.
Q: I found a piece of natural driftwood. Should I record this on the survey sheet?
A: No. Natural woody debris does not fall under the official definition of marine debris. Only
processed or treated lumber should be recorded.
Q: I found an item that is coated in one material type, and composed of another. How do I record it?
A: Items should be recorded according to the primary material type on the surface of the item.
Q: I found multiple pieces of a larger piece of debris. Should I record it as one item or multiple
items?
A: Record the item in the condition you found it. If the item was broken when you found it, record
each piece separately. If it broke while you were examining it, record the debris as one item only.
Q: There is debris beyond the first barrier or change in substrate at the back of the shoreline. Can I
record those items?
A: Items located beyond the first barrier can be noted and described in the notes section of the data
sheet (or on a separate data sheet), but this data should be compiled separately from the shoreline
debris data.
Q: What should I do if I find debris fouled with what might be invasive species?
A: If you suspect that you may have found debris with invasive species, please take clear photos of
the item, attached organism, and any identifying marks on the object. Remove the item from the
water or shoreline and place on dry land well above the high tide line. You may want to contact local
taxonomic experts listed at http://www.anstaskforce.gov/Tsunami.html. In your report note the
current location of the item.
Q: What should I do if I find a piece of hazardous debris?
A: If you encounter hazardous items such as oil or chemical drums, contact your local authorities (a
911 call), state environmental health agency, and the National Response Center 1-800-424-8802.
Provide as much information as possible so the authorities can determine how to respond.
Q: What should I do if I find a derelict vessel or other large object that may become a hazard to
navigation?
A: Contact your local authorities (a 911 call), state environmental health agency, and the U.S. Coast
Guard Pacific Area Command at 510-437-3701. Provide as much information as possible so the
authorities can determine how to respond.
Q: What should I do if I find an item that may be a valuable or significant memento?
A: If an item has unique identifiers and may be traceable to an individual or group, please take
photos and report the item to [email protected] (note that the item was found during a
monitoring survey). Use your best judgment to determine what may or may not be valuable.
Q: I am completing standing-stock surveys. Why do I need to take GPS coordinates of all four
transects at every survey?
A: Taking GPS coordinates of each transect helps NOAA to track the location of transects and to
ensure that the survey site location is not changing over time (due to moving landmarks or shifting
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beach dynamics). Additionally, it helps to ensure that site start/end points are located correctly and
that equipment is functioning properly.
Q: I am completing standing-stock surveys, and at multiple surveys I have been encountering the
same item. Should I tally this item at each survey (assuming it is in one of the random transects)?
A: Yes! This is part of the reason that standing-stock surveys are informative. They provide
information on the density of debris on the shoreline and how it changes over time. Debris that
remains on the shoreline for long periods of time is part of the “standing-stock.” The persistence of
the item can be noted in the notes section of the data sheet.
Data Entry and Submission
Q: How do I get access to the NOAA MD-MAP database?
A: Send an email to [email protected] for questions about the database or to request a login.
Q: How often should I upload data to the NOAA MD-MAP database?
A: Please enter data into MD-MAP as soon as possible after each survey to ensure that data is
entered accurately.
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Penny Pritzker
United States Secretary of Commerce
Dr. Kathryn D. Sullivan
Acting Under Secretary of Commerce for Oceans and Atmosphere
Dr. Holly A. Bamford
Assistant Administrator, National Ocean Service
| File Type | application/pdf |
| File Modified | 2013-12-02 |
| File Created | 2013-11-27 |