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Apr 26, 2012
Coastal-Change Impacts during Hurricane Katrina: An Overview
Authors: Asbury Sallenger [email protected], C. Wayne Wright [email protected], and Jeff Lillycrop [email protected]Author Affiliations
Publication: Coastal Sediments '07
Abstract
As part of an ongoing cooperative effort between USGS, NASA and USACE, the barrier islands within the right-front quadrant of Hurricane Katrina were surveyed with airborne lidar both before and after landfall. Dauphin Island, AL was located the farthest from landfall and wave runup intermittently overtopped its central and western sections. The Gulf-side of the island experienced severe erosion, leaving the first row of houses in the sea, while the bayside accreted. In contrast, the Chandeleur Islands, LA did not experience, this classic ‘rollover'. Rather, the island chain was completely stripped of sand, transforming a 40-km-long sandy island chain into a discontinuous series of muddy marsh islets. Models indicate that storm surge likely submerged the entire Chandeleur Island chain, at least during the latter part of the storm. The net result was destructive coastal change for the Chandeleur Islands, while Dauphin Island tended to maintain its form through landward migration.
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© 2007 American Society of Civil Engineers.
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Published online: Apr 26, 2012
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U. S. Geological Survey, 600 4th St. South, St. Petersburg, FL 33701. E-mail: [email protected]
National Aeronautics and Space Administration, Wallops Flight Facility, Wallops Island, VA 23337. E-mail: [email protected]
U.S. Army Engineer District-Mobile, Joint Airborne Lidar Bathymetry Technical Center of Expertise, 109 St. Joseph Street, Mobile, AL 36602. E-mail: [email protected]
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