Shoreline Characterization

How do I determine the back of the shoreline?

The back of the shoreline is defined by the MDMAP as the first major change in substrate, which may include a vegetation line, cliff, or other barrier. If you are interested in also monitoring debris that may be 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 flux or concentration. Data entered into the NOAA database should only reflect the debris up to the first change in substrate.

How do I measure beach slope?

Beach slope is a measure of the angle of the beach, which affects how debris is deposited on the shoreline. Although rigorous approaches to measuring beach slope exist, for the purposes of MDMAP, beach slope can be visually estimated. For your shoreline characterization, please record the slope of the beach in the foreshore or the beach face (the area between low and high tide). The beach slope may steepen or flatten seasonally and over time (e.g., large storm events may increase the slope).

If my shoreline is greater than six meters wide, I need to record GPS coordinates at all four corners of the survey site. How do I take GPS coordinates at the water’s edge when waves are washing in and out?

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 and always remember that your safely comes first!

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