Design

Several attempts by the Louisiana Department of Transportation and Development to protect the shoreline and Louisiana Highway 82 are discussed. To identify the important factors needed for proper design of shore protection structures, failures of earlier efforts, as well as the success of recent efforts, are evaluated. An emphasis should be placed on the acquisition of wave data, as well as a survey of the offshore profile. Porosity of the revetments, underlayers, and geotextiles seems to be important in the stability of the structure. Scour at the toe is another design consideration in design of revetment structures. Project cost of shoreline protection was considerably reduced by providing alternates through competitive bidding. The 1984 and 1988 cabled and noncabled blocks and cast-in-place revetments have been exposed to several storms and have performed satisfactorily. The only damage to the roadway has been associated with landside foreslope at the time of overtopping.

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