Optimization of Ebb Shoal Mining and Beach Nourishment at St. Johns County, St. Augustine Inlet, Florida, Report 3
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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This report, the third in a series documenting a study of St. Johns County, Florida, describes the application of GenCade to the study area as part of a greater Regional Sediment Management RSM study. This study illustrates the use of GenCade, a coastal evolution and sediment transport model, as a tool for optimization in management practices for Operations Maintenance OM. Results of the calibration showed good agreement NRMSE 6.8 percent, Correlation Coefficient 0.61, and Pattern Correlation 93.9 percent with the measured sediment budget for the study area. The application of the model to calculate long-term with project sediment budget alternatives proved useful in determining an optimized schedule for sediment management activities. The ideal dredging interval for the navigation channel entrance and ebb-tidal delta mining was determined to be most beneficial at 10-year intervals, with beach fill projects being fulfilled at the most favorable placement location and highest yield volume density. The results of a 10-year incremental, strategic placement of three million cubic yards over a 50-year period will potentially save up to 10 million in mobilization costs and reduce OM needs for the St. Johns County Federal Projects.
- Hydrology, Limnology and Potamology