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Once the EFDC modeling scheme is calibrated against data from the present field test, it will be used to evaluate PEP Reef performance in terms wave attenuation and sand trapping. Monitoring of the Vero Beach PEP Reef has shown that the Reef structures have settled into the sandy substrate by more than 2 feet on the average. Settling of the Reef structures may reduce wave energy attenuation preventing the Reef segments from realizing full shore protection potential. This aspect of the PEP Reef installation will be included in the model tests. 3.0 Scope of Work The scope of work will include two overall objectives: 1) to calibrate tHc model for circulation, wave dynamics and sediment transport in the vicinity of the PEP Reef and 2) to apply the calibrated model to simulate the performance of the PEP Reef in terms of wave transmission reduction, modification of sediment deposition patterns, and related processes. As part of the second objective the model will be used to compare conditions within the PEP Reef field to conditions in the control areas to the north and south. 3 the longshore direction and offset in the on -offshore direction to allow circulation and minimize water level set-up between the reef and shoreline. This original test indicated • that the segmented PEP Reef design would reduce wave height transmission by 5 to 40% and result in some buildup of sand volume between the shoreline and Reef structures. ® The original tests also suggested that there would be some scour around the base of the Reef. Monitoring results, thus far, have been consistent with the original model test. • Topographic data collected to date show buildup of volume inside the reef field and some accretion of sand at the shoreline in the first two months after PEP Reef deployment. Scour around the base of the PEP Reef has also been documented. Wave data collected in the vicinity of the Reef shows reduction of wave heights in the range of 10 to 23% in the first few months. Further wave studies are underway to determine what portion of wave height reduction is related simply to shoaling affects. From these results it is clear that the modeling scheme is a useful tool for predicting the performance of shore protection structures in the dynamic nearshore zone. Calibration of the modeling scheme will improve its utility for this purpose. Once the EFDC modeling scheme is calibrated against data from the present field test, it will be used to evaluate PEP Reef performance in terms wave attenuation and sand trapping. Monitoring of the Vero Beach PEP Reef has shown that the Reef structures have settled into the sandy substrate by more than 2 feet on the average. Settling of the Reef structures may reduce wave energy attenuation preventing the Reef segments from realizing full shore protection potential. This aspect of the PEP Reef installation will be included in the model tests. 3.0 Scope of Work The scope of work will include two overall objectives: 1) to calibrate tHc model for circulation, wave dynamics and sediment transport in the vicinity of the PEP Reef and 2) to apply the calibrated model to simulate the performance of the PEP Reef in terms of wave transmission reduction, modification of sediment deposition patterns, and related processes. As part of the second objective the model will be used to compare conditions within the PEP Reef field to conditions in the control areas to the north and south.