Parent Layer: Environmental Conditions

Name: Shoreline Change Rate

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Type: Raster Layer

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Description: Marsh shorelines and bayshore beaches are subject to the erosive action of storm and boat wake-driven waves. Fagherazzi (2013 The ephemeral life of a salt marsh. Geology, 41, 943–944) suggested that while coastal marshes are relatively stable in the vertical direction if enough sediment is available, they are inherently unstable along the horizontal direction due to lateral erosion. This Shoreline Erosion dataset was generated by Rutgers Center for Remote Sensing & Spatial Analysis. Areas of coastal marsh lost to shoreline erosion were determined by comparing the shoreline position changes between a baseline year during the 1970s and 2010. The calculated annual erosion rate (in feet/year) for each marsh shoreline cell was then projected inland to the year 2050 to map areas vulnerable to future shoreline erosion. <br><br> Additional Information <br><br> The baseline marsh/back bay shoreline was defined by the 1977 New Jersey Tidelands Claimed line. The NJDEP Tidelands claims map (http://www.nj.gov/dep/gis/tidelandsshp.html) depicts areas now or formerly flowed at or below mean high tide as of 1977. The “Claimed” and “Unclaimed” tidelands were extracted and the individual map tile boundaries dissolved. The tidelands data were rasterized at a grid size of 10 m to match the New Jersey DEM (provided by NOAA CSC) spatial extent. <br><br> To depict the shoreline at 2010, the Mean Tide Level (MTL) water surface layer from NOAA CSC V-Datum water surface layers was differenced against the NOAA CSC NJ DEM (at 10 m grid size). The Tidelands Claimed layer was buffered inland. The resulting buffer distance file was overlaid with the NJ_water_mask to determine those areas where the shoreline eroded (Tidelands Buffer and Water) vs. areas that have accreted (Not Tidelands and Not water) vs. No Change. Due to the 2010 baseline for the V-Datum MTL data and the 1977 year for the Tidelands data, there was a 33 year difference in time. Given a 10 m grid cell width, this equates to approximately 1 foot for year (10 m = approx. 33 feet; 33 ft/33 yr = 1 ft/yr). The calculated annual erosion rate for each shoreline cell was then projected inland to the year 2050 to map areas vulnerable to future shoreline erosion.

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