snep_saltmarsh

In support of the Environmental Protection Agency (EPA), the Great Lakes Environmental Center’s (GLEC) subcontractor, Eastern Research Group, Inc. (ERG), used the Sea Level Affecting Marshes Model (SLAMM) to examine how three salt marshes in Southeast New England protect surrounding communities from projected sea level rise and storm surge.

This repository houses the code used for SLAMM modeling and for the evaluation analysis.

Notebooks

1. Process data for SLAMM modeling
   • process_dem.ipynb
   • process_dams.ipynb
   • process_nwi.ipynb
   • process_slosh.ipynb
   • process_impervious_surface.ipynb
   • salt_elevation.ipynb
   • sea_level_rise.ipynb
2. Polygonize SLAMM output so it's ready for analysis
   • polygonize_slamm_output.ipynb
3. Inundation analysis
   • intersect_pop.ipynb
   • intersect_properties.ipynb
   • intersect_roads.ipynb
   • fants_roads.ipynb
4. Create maps of results
   • create_veg_maps.ipynb
   • create_flood_maps.ipynb
   • create_cranberry_maps.ipynb

Excel workbooks

Workbook used to calculate traffic delay costs for road inundation:

• roads_affected.xlsx

Workbooks to calculate estimated damages and severity of inundation to land and residences:

• cc1_homes_affect_fract_econ.xlsx
• ma2_homes_affect_fract_econ.xlsx
• ri2_homes_flooded_all_econ.xlsx

Data Sources for SLAMM modeling

Model input	Marsh	Data Name	Data Source
Digital elevation model	MA-2 and CC-1	Bare earth Lidar DEM	MassGIS
Digital elevation model	RI-2	Topobathymetric Elevation Model of New England	U. S. Geological Survey
Wetlands Classification	All marshes	National Wetlands Inventory	U.S. Fish and Wildlife
Impervious Surfaces	RI-2	RI Impervious Surface	RIGIS
Impervious Surfaces	MA-2 and CC-1	MA Impervious Surface	Massachusetts Executive Office of Energy and Environmental Affairs
Storm Surge	All marshes	The Sea Lake and Overland Surges from Hurricanes (SLOSH) model	NOAA

Data Sources for Inundation Analysis

Data analyzed	Data Name	Data Source
Population	MA 2020 Census Data	MassGIS
Population	U.S. Census Data	ESRI Federal Data
Roads	MA 2020 U.S. Census Tiger Roads	MassGIS
Roads	RIDOT Roads (2016)	RIGIS
Properties	Property Tax Parcels	MassGIS
Properties	Town of Barrington Property Tax Parcels	Town on Barrington