Parent Layer: Alabama

Name: GOM erosion hazards AL

Display Field: DHIGH

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: These data sets contain information on the probabilities of hurricane-induced erosion (collision, inundation and overwash) for each 1-km section of the Gulf of Mexico coast for category 1-5 hurricanes. The analysis is based on a storm-impact scaling model that uses observations of beach morphology combined with sophisticated hydrodynamic models to predict how the coast will respond to the direct landfall of category 1-5 hurricanes. Hurricane-induced water levels, due to both surge and waves, are compared to beach and dune elevations to determine the probabilities of three types of coastal change: collision (dune erosion), overwash, and inundation. Data on dune morphology (dune crest and toe elevation) and hydrodynamics (storm surge, wave setup and runup) are also included in this data set. As new beach morphology observations and storm predictions become available, this analysis will be updated to describe how coastal vulnerability to storms will vary in the future. The data presented here include the dune morphology observations, as derived from lidar surveys.

Copyright Text: The predicted elevations of combined high tide and storm surge for category 1-5 hurricanes were extracted from the National Oceanic and Atmospheric Administration (NOAA) SLOSH (Sea, Lake, and Overland Surges from Hurricanes) model, which has been employed by NOAA in inundation risk studies and operational storm surge forecasting. Wave runup and setup conditions were generated using SWAN software developed by Delft University of Technology (TU Delft).

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XMin: -9895050.9831
YMin: 3529030.7476999983
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YMax: 3546549.983099997
Spatial Reference: 102100  (3857)

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: FID )
• Shape_Length ( type: esriFieldTypeDouble, alias: Shape_Length )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• DHIGH ( type: esriFieldTypeDouble, alias: DHIGH )
• DLOW ( type: esriFieldTypeDouble, alias: DLOW )
• DHIrms ( type: esriFieldTypeDouble, alias: DHIrms )
• DLOrms ( type: esriFieldTypeDouble, alias: DLOrms )
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