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Conceptual marsh units of Massachusetts salt marshes

Dates

Publication Date

Citation

Ackerman, K.V., Defne, Z., and Ganju, N.K., 2021, Geospatial Characterization of Salt Marshes for Massachusetts: U.S. Geological Survey data release, https://doi.org/10.5066/P97E086F.

Summary

This data release contains coastal wetland synthesis products for Massachusetts, developed in collaboration with the Massachusetts Office of Coastal Zone Management. Metrics for resiliency, including unvegetated to vegetated ratio (UVVR), marsh elevation, and tidal range are calculated for smaller units delineated from a digital elevation model, providing the spatial variability of physical factors that influence wetland health. The U.S. Geological Survey has been expanding national assessment of coastal change hazards and forecast products to coastal wetlands with the intent of providing Federal, State, and local managers with tools to estimate the vulnerability and ecosystem service potential of these wetlands. For this purpose, [...]

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CMU_MA_Browse.png
“Conceptual marsh units overlaying Esri basemap”
thumbnail 1.98 MB image/png
Shapefile: CMU_MA.zip
CMU_MA.CPG 5 Bytes
CMU_MA.dbf 3.91 MB
CMU_MA.prj 425 Bytes
CMU_MA.sbn 120.03 KB
CMU_MA.sbx 3.39 KB
CMU_MA.shp 463.88 MB
CMU_MA.shx 100.93 KB
CMU_MA.sld 9.15 KB

Purpose

These polygons were created to be used in evaluating the spatial variation of the response and resiliency of salt marsh complexes based on consistently defined marsh units while facilitating a better understanding of the relative importance of the processes involved. The salt marshes of Massachusetts were delineated to smaller, conceptual marsh units by the geoprocessing of surface elevation data. Flow accumulation based on the relative elevation of each location is used to determine the ridge lines that separate each marsh unit while the surface slope is used to automatically assign each unit a drainage point, where water is expected to drain through.

Additional Information

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