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®2 - mean currents). in the model update, simulations will be run in a time -marching model so 1that currents, sand transport, and topographic evolution can be simulated over time and ® compared with monitoring results. This is possible due to a new generation of computers coming on-line since the original model study (Zarillo and Surak, 1995) and due to 0 incorporation of wave equations within the EFDC model. In the previous version, the wave field was calculated separately, and wave forces from a steady state wave calculation then read into the EFDC circulation/transport model. The newer version will include wave • calculations within the circulation modeling scheme. 1.1 Technology Transfer and Benefits to Indian River County The specific goal of this project is to evaluate the performance of the PEP Reef Erosion design using the results of the ongoing field test in combination with tests performed with the three-dimensional hydrodynamics and circulation model. However, the more general goal is to transfer a user-friendly modeling scheme to IRC that can be applied to a much wider range of conditions. This will be accomplished by developing a users manual for application of the EFDC model, which will guide the user through model setup and application. The EFDC model is chosen for this project due to its firm basis in physics (thus, the term primitive equation model) and applicability to predictions in shallow marine and estuarine environments. For instance, EFDC can be applied as a tool to design optimal dredging for marinas and navigation channels, to predict environmental impacts of freshwater diversion to and from the Indian River Lagoon (IRL), to predict the magnitude of storm surge on the open coast and in the IRL, and to predict a wide range of other circulation and transport conditions. A more detailed description of EFDC is provided in Appendix A of this document. At the close of the project, Florida Tech will conduct a 1 to 2 day workshop at TRC Public Works to review project results and t� instruct Public Works personnel in model setup and operation. The Environmental Fluid Dynamics Code (EFDC) was modified to include a wave - boundary layer sub -model and a coupled sediment transport scheme for sand transport (Zarillo and Surak). The modified numerical scheme was then used to test the performance of a segmented PEP Reef design in which reef segments were separated in