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currents in the study area. The primary focus of the task will be the determination of the parameters <br /> required to properly simulate the currents and water levels. <br /> iii. Wave Transformation Calibration <br /> Wave measurements and water levels will provide the offshore boundary conditions for each calibration <br /> run. Available nearshore data will be used to calibrate the transformation of the waves. FIT collects <br /> offshore data in 90 feet of water and closer in at 26 feet. This data will be used to calibrate the wave <br /> transformation. The purpose of this task will be the determination of the parameters required to <br /> properly estimate wave transformation. <br /> iv. Calibration of Morphological Changes (Erosion&Deposition) <br /> Once the DeIft3DFLOW and SWAN models have been calibrated to simulate water levels, currents, <br /> and wave transformation, the Delft3DFLOW model will be calibrated to simulate morphological changes <br /> (erosion & deposition) specific to this study. The basis for calibration will be the beach profile and <br /> bathymetric changes between at least one past condition and the present condition. The starting <br /> bathymetry for each calibration run will be a past bathymetry. The present bathymetry or another past <br /> bathymetry will provide the basis for evaluating the results. The model will be calibrated to match the <br /> sediment budget developed through comparison of survey data. <br /> Wave climate information will be utilized to determine the typical wave conditions during the <br /> morphological change calibration period. The typical wave conditions will be schematized using <br /> approximately 19 wave cases (CPE, 2009) combined with a representative tide to delineate the <br /> offshore boundary conditions. A sufficient number of calibration runs will be performed to determine the <br /> best combination of parameters to realistically simulate the beach profile changes in the entire study <br /> area. <br /> V. Modeling of Preliminary Alternatives <br /> As discussed previously, a finer grid and the DELFT3D-FLOW module will be applied in Sectors 3, 5, <br /> and 7, where fill and structural solutions will likely be required to address chronic erosional problems. <br /> The preliminary alternatives developed during the beach management strategy section will be <br /> evaluated using the Defft3D model. We will model two fill only scenarios and 4 structural solutions. <br /> Each modeled alternative will be compared to a baseline condition in order to draw conclusions on the <br /> expected result of implementing each scenario. Optimization of the structural layout is not proposed as <br /> part of this effort. Instead, the concept will be evaluated to determine whether it is cost effective and <br /> feasible, and estimate any downdrift or offshore impacts. <br /> The alternatives analysis will incorporate up to 14 production runs. Each of the 7 alternatives (no <br /> action, 2 fill scenarios and 4 structural scenarios), will be analyzed under a 10-year storm event and <br /> then a 5-year simulation period. <br /> 34 <br />