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].

  • 2015-03-01

Filetype[PDF-140.45 KB]


  • English

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    • 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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