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Kevin M Befus

Groundwater emergence and shoaling extents are derived from water table GeoTIFFs, which are calculated as steady-state groundwater model heads subtracted from high-resolution topographic Digital Elevation Model (DEM) land surface elevations. Results are provided as shapefiles of water table depth in specific depth ranges, with the following data coding in the "fbin_m" data column: -1 = marine inundation (below marine boundary condition (LMSL or MHHW) sea level) 0 = water table at or above ground surface (emergent groundwater) 1 = water table between 0-1 m depth (very shallow) 2 = 1-2 m depth (shallow) 5 = 2-5 m depth (moderate) 6 = > 5 m depth (deep) Model results are aggregated by County, with separate County...
Depth to groundwater (water table depth) results are calculated as steady-state groundwater model head results subtracted from high-resolution topographic Digital Elevation Model (DEM) land surface elevations. Results are provided here as GeoTIFF rasters of water table depth. See Groundwater_head_and_water_table_depth_methods.pdf for additional details. Model results are aggregated by County, with separate County files for model results using the Local Mean Sea Level (LMSL) and Mean Higher-High Water (MHHW) marine boundary conditions. Each zipped County datafile (County_MHHW or County_LMSL) contains 6 folders: 3 containing full model results for each of the three horizontal hydraulic conductivities (Kh) used in...
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Coastal groundwater levels (heads) can increase with sea level rise (SLR) where shallow groundwater floats on underlying seawater. In some areas coastal groundwater could rise almost as much as SLR, but where rising groundwater intersects surface drainage features, the increase will be less. Numerical modeling can provide insight into coastal areas that may be more or less vulnerable to hazards associated with SLR-driven groundwater shoaling (moving closer to the ground surface) and emergence (flooding the ground surface), providing coastal planners with critical information that can be used to increase public safety, mitigate physical damages, and more effectively manage and allocate resources in complex coastal...
Categories: Data
Groundwater head (water table elevation relative to NAVD88) results are from steady-state groundwater models. Results are provided here as GeoTIFF rasters of groundwater head. See Groundwater_head_and_water_table_depth_methods.pdf for additional details. Model results are aggregated by County, with separate County files for model results using the Local Mean Sea Level (LMSL) and Mean Higher-High Water (MHHW) marine boundary conditions. Each zipped County datafile (County_MHHW or County_LMSL) contains 6 folders: 3 containing full model results for each of the three horizontal hydraulic conductivities (Kh) used in the model (0.1, 1.0 and 10 m/d), and 3 containing "linear" results for each of the 3 Kh's, where sea...
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