| snippet:
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Tidal marsh retreat
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| summary:
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Tidal marsh retreat
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| extent:
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[[-75.5929986767648,38.8521178282711],[-73.8716828619464,41.361330461307]]
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| accessInformation:
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| thumbnail:
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thumbnail/thumbnail.png
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| typeKeywords:
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["Data","Service","Map Service","ArcGIS Server"]
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| description:
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To project future marsh change under projected sea level rise (SLR), a marsh change data product provided by the NOAA Office for Coastal Management that was developed for the US Digital Coast Sea Level Rise Viewer (https://coast.noaa.gov/digitalcoast/tools/slr.html) was employed. The NOAA marsh change product, based on Sea Level Affecting Marshes Model (SLAMM), identifies coastal marsh areas (includes estuarine and brackish marsh areas dominated by <em>Spartina alterniflora, Spartina patens</em> and <em>Phragmites australis</em>) that may be vulnerable for conversion to either non-vegetated or open water. The NOAA implementation employs a "modified bathtub" approach that incorporates local and regional tidal variation of mean higher high water (MHHW). Marsh areas that are predicted to be submerged below Mean Tide Level are classed as converting to tidal flats (i.e., non-vegetated mud/peat/sand unconsolidated shore and/or tidal flat). When the marsh elevation dips below the Mean Low Water threshold, the marsh is classed as converting to open water. Further upstream along tidal rivers and creeks existing tidal brackish/freshwater marsh may convert to salt marsh when submerged below MHHW.
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Based on the consensus sea level rise (SLR) estimates determined for New Jersey of 1’, 2’ and 3’ of SLR at 2050 were used. A "moderate" vertical accretion rate of 4mm yr<sup>-1</sup> (i.e., 4mm yr<sup>-1</sup> over a 50yr time frame from 2000 to 2050) was chosen based on best available information as to present rates of marsh accretion over the broader MidAtlantic region. As the NOAA-predicted marsh change product does not explicitly model marsh shoreline edge erosion, estimated past shoreline erosion rates to project future shoreline location. Shoreline erosion rates were determined by comparing the shoreline position changes between a baseline year during the 1970s and a contemporary year in the 2010s. The baseline shoreline was defined by the 1977 New Jersey Tidelands Claimed line. This composite future marsh change data product was developed by the Rutgers University Center for Remote Sensing in 2020. |
| licenseInfo:
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| catalogPath:
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| title:
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MarshRetreat
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| type:
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Map Service
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| url:
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| tags:
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["CERAP"]
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| culture:
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en-US
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| name:
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MarshRetreat
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| guid:
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06E33B22-3399-435A-BD20-BF4914C2CA4B
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| spatialReference:
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WGS_1984_Web_Mercator_Auxiliary_Sphere
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