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Hurricane Gustav
Post-Landfall Assessment of Potential Coastal-Change Impacts
Posted: 09/05/2008 7pm
Note: The post-landfall assessment of potential coastal-change impacts is done by comparing pre-storm dune/berm elevations to updated surge elevations obtained from model simulations based on the actual storm scenario.
Prior to hurricane landfall, the potential inundation of the beach system and associated coastal changes were initially assessed by comparing pre-storm dune/berm elevations to maximum surge elevations obtained from model simulations of hypothetical storm scenarios.
After landfall, updated surge elevations were obtained from model simulations based on the actual storm scenario. The potential for inundation was then re-assessed for the same five focus areas: Galveston Bay, Chenier Plain (southwest coast of LA), Isles Dernieres, Chandeleur Islands, and Dauphin Island. Extreme coastal change is expected to occur in areas where the updated surge levels indicate inundation (indicated by red on the maps).
Location map for five areas of focus and the track of Hurricane Gustav. Click on any of the five areas to see the updated potential inundation map for that area. |
Galveston Bay, TX
Updated assessment of inundation potential (I, storm surge minus dune elevation) for Galveston Bay, TX. Reds indicate areas where modeled surge, specific to Hurricane Gustav storm conditions and landfall location, exceeds the elevation of the primary dune, suggesting greater potential for inundation of the beach system and for severe coastal changes. [larger version] |
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Western Louisiana Chenier Plain
Updated assessment of inundation potential (I, storm surge minus dune elevation) for the southwest Chenier Plain of LA. Reds indicate areas where modeled surge, specific to Hurricane Gustav storm conditions and landfall location, exceeds the elevation of the primary dune, suggesting greater potential for inundation of the beach system and for severe coastal changes. [larger version] |
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Isles Dernieres, LA
Updated assessment of inundation potential (I, storm surge minus dune elevation) for the Isles Dernieres, LA. Reds indicate areas where modeled surge, specific to Hurricane Gustav storm conditions and landfall location, exceeds the elevation of the primary dune, suggesting greater potential for inundation of the beach system and for severe coastal changes. [larger version] |
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Chandeleur Islands, LA
Updated assessment of inundation potential (I, storm surge minus dune elevation) for the Chandeleur Islands, LA. Red indicates areas where modeled surge, specific to Hurricane Gustav storm conditions and landfall location, exceeds the elevation of the primary dune, suggesting greater potential for inundation of the beach system and for severe coastal changes. [larger version] |
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Dauphin Island, AL
Updated assessment of inundation potential (I, storm surge minus dune elevation) for Dauphin Island, AL. Reds indicate areas where modeled surge, specific to Hurricane Gustav storm conditions and landfall location, exceeds the elevation of the primary dune, suggesting greater potential for inundation of the beach system and for severe coastal changes. [larger version] |
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U.S. Department of the Interior |
U.S. Geological Survey
