Development of wave and surge atlas for the design and protection of coastal bridges in South Louisiana : [research project capsule].
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Development of wave and surge atlas for the design and protection of coastal bridges in South Louisiana : [research project capsule].

Filetype[PDF-140.45 KB]


English
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  • Creators:
    Sheppard, D. Max
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Subject/TRT Terms:
  • Publication/ Report Number:
    15-1ST
  • Resource Type:
    Brief
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    The recently completed Louisiana Department of Transportation and Development

    (DOTD) Storm Surge and Wave Atlas contains signifi cant hydraulic information that will

    be useful in analyzing storm surge and wave forces on existing and new coastal bridges.

    The current Atlas contains surge and wave information for storms with a 1% chance of

    occurrence each year (100-year return interval). This information is useful for computing

    wave loads on bridge superstructures. However, many issues encountered by DOTD

    engineers require other frequency meteorological/oceanographic information (e.g.,

    5-, 10-, 25-, 50-year return intervals). For instance, engineers may design a temporary

    facility (a detour bridge) based on a 5-year return interval (20% chance of occurrence

    each year). Bridges whose service life is approaching their design life may undergo

    retrofi tting based on a return interval diff erent from the 100-year return interval.

    The information needed for these designs exists in the Level III analysis solution fi les

    developed in the recently completed Wave and Surge Atlas (Phase I) project.

    Because of the size of the study area and the amount of information available in the

    recently completed Surge/Wave Atlas (GIS database) for the 100-year return interval, it is

    prudent to provide a separate GIS database for each of the other desired return intervals.

    Therefore, this work will produce a separate GIS database for a 50-year return interval

    (2% chance of occurrence each year), a 25-year return interval (4% chance of occurrence

    each year), a 10-year return interval (10% chance of occurrence each year), and a 5-year

    return interval (20% chance of occurrence each year).

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