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1.0 Introduction and Goals ® The overall goal of this work is to provide Indian River County (IRC) with a numerical modeling scheme that can be used for a wide range of engineering and environmental applications. It is envisioned that the model, known as the Environmental Fluid Dynamics Code (EFDC), will be transferred to IRC as a complete package. The modeling scheme will i..,i.... 'L:.. 1:.....:,... he ego D.,.,..1. DDD I—. uia� �.. '.7,..t.... '.. lllVIUYI U -VII llV [i��IlVUL1 Vll lV lllV VIV LVYV1l IDE. Y G UJVI J E',UIYV lllUl VQ11 VG 0 used to apply the model to other locations The specific goal of this project is to verify both the utility of the EFDC Model and the performance of the Vero Beach PEP Reef using a series of calibrated model runs. The PEP Reef has been monitored for performance since August of 1996. In general, monitoring data include PEP Reef elevation, transmission of wave energy across selected portions of the Reef, and changes in shoreface/beach topography in the Reef area and in control areas to the north and south. These data sets, along with additional information on local sediments and meteorological conditions will be used to drive and calibrate the model. The model application will provide an additional dimension to the analysis of PEP Reef performance that is not achievable using the monitoring data, which is largely one- dimensional. The monitoring data, although of high quality, represents only a small portion of the project area due to the high cost of the field effort. Model simulations will provide a truly three-dimensional look at the PEP Reef performance and comparison with adjacent control zones. Model predictions that provide good spatial coverage and monitoring data that provide good temporal coverage will be combined into a more comprehensive and understandable analysis of DCD ncefperformance. The initial phase of project will include certain modifications to EFDC to enable the modeling scheme to include wave forcing from observed wave conditions at Vero Beach and to include transport of sand sized sediment on the shoreface and intertidal beach. In the original version of EFDC, which was applied to evaluate the probable performance of the Vero Beach PEP Reef, the model was run in a "steady-state" mode to accommodate the widely differing time scales of physical processes on the beach and shoreface (waves and