Name: Marsh Edge Erosion
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Description: The marsh edge loss vector data layer was created to identify, quantify and visualize erosional changes in the footprint of the coastal back bay marshes from 1977 to 2012. This layer is focused on loss of marsh edge and does not examine areas that advanced through sediment accretion. Marsh erosion and losses were identified by comparing the seaward extent of the marsh edge between the New Jersey Department of Environmental Protection (NJDEP) Tidelands Claim Line and the NJDEP’s 2012 Land Use/Land Cover (LU/LC) vector shapefiles. The NJDEP states that, “the Tidelands claims line depicts areas now or formerly flowed at or below mean high tide. Since the mean high water line may change because of rises in sea level, the line does not represent the current mean high water line. Rather it depicts the mean high water line at the time of mapping and the historic mean high water line predating artificial alterations.” Erosional polygons were defined by areas classified as “Unclaimed” or above the mean high water line (MHW) in the Tidelands layer and classified as water or below MHW in the 2012 LU/LC. Erosional areas are not limited to effects from natural process and include loss due to human alterations to the marsh habitat. These erosional areas could potentially receive dredged material to restore the marsh to the location of the MHW mapped in the Tidelands Claim Line dataset.
Copyright Text: Stockton University - Coastal Research Center 30 Wilson Ave. Port Republic, NJ 08241
E-mail: crc@stockton.edu Phone: (609) 652-4245
GIS DATA CITATIONS 1.) NJDEP Tidelands, New Jersey Department of Environmental Protection (NJDEP), Bureau of Tidelands Management. 1996. NJDEP Tidelands. Bureau of Tidelands Management, Trenton, NJ. Vector Digital Data for Atlantic South, Atlantic Central, and Atlantic North. Last Accessed March, 2017. 2.) Land Use/Land Cover 2012, New Jersey Department of Environmental Protection (NJDEP), Office of Information Resources Management (OIRM), Bureau of Geographic Information Systems (BGIS). 2015. Land Use/Land Cover 2012 Update. NJDEP, Trenton, NJ Vector Digital Data for Subbasins (HU8) 02040301 (Mullica – Toms River), 02040302 (Great Egg Harbor). Last Accessed March, 2017. http://www.state.nj.us/dep/gis/
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