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Development of wave and surge atlas for the design and protection of coastal bridges in south Louisiana : [tech summary].

Filetype[PDF-223.12 KB]


English
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  • Creators:
    Sheppard, D. Max
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Brief
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    The failures of highway bridges on the Gulf Coast seen in the aftermath of Hurricane Katrina in 2005 were unprecedented.

    In the past four decades, wind waves accompanied by high surges from hurricanes have damaged a number of coastal

    bridges along the north coast of the Gulf of Mexico. Hurricane Camille in 1969 caused damage to bridges across Bay St.

    Louis and Biloxi Bay in Mississippi. Katrina damaged the same bridges rebuilt after Camille. In 1979, Hurricane Frederic

    destroyed the bridge connecting the mainland to Dauphin Island, a barrier island near the entrance of Mobile Bay,

    Alabama. In the 2004 hurricane season, Hurricane Ivan destroyed the bridge on I-10 over Escambia Bay in Florida.

    There are a large number of coastal bridges in South Louisiana. This study addresses

    several aspects of evaluation of these bridges including: how many bridges are vulnerable

    to the impact of hurricanes; determination of the design wave and surge conditions at

    those bridge locations; and calculation of the wave forces on the bridge superstructures.

    The storm surge elevation, wave height, and wave period are the three most important

    meteorological and oceanographic (met/ocean) parameters needed to calculate wave

    forces according to AASHTO’s Guide Specifi cation for Bridges Vulnerable to Coastal

    Storms. This information is currently not available for South Louisiana’s coastal waters. To

    address these concerns, LTRC funded this project to develop the design surge elevations

    and wave heights for South Louisiana, and present the data in a Geographical Information

    System (GIS) database.

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