The Lakeshore Park, Ashtabula, Ohio, Breakwater Project.
COASTAL ENGINEERING RESEARCH CENTER VICKSBURG MS
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This report documents the bathymetric and shoreline response to a three-segment detached breakwater and beach-fill shore protection project constructed in 1982 at Lakeshore Park, Ashtabula, OH. The beach fill was rapidly lost from the project area, and a monitoring program was established in 1984 to document the loss of beach material and to evaluate the performance of the project. Data collected during the monitoring program include bathymetric surveys, aerial photography, and Littoral Environment Observation LEO data. Results from the monitoring program and subsequent analysis indicate the placed beach material was finer graded than was specified the majority of this material was shoaled in a boat launch area at the western end of the park. Based on LEO data, a volume change analysis, and a frequent need in the postproject period to dredge the boat launch area at the western end of the park, an east to west direction of sediment transport was indicated. Comparisons with other segmented detached breakwater- projects indicate that performance of the Lakeshore Park structures may be improved by adding stone to decrease the gap width between segments or to increase the crest elevation. Recent modifications to Lakeshore Park, two groins built at either end of the project area and coarser graded beach fill, are discussed in the report. Based on results from the monitoring program, the west groin should present an effective trap for littoral sediment provided it extends out to intercept longshore moving material. In addition, the coarser graded fill should provide a more stable beach. fr
- Civil Engineering