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in the navigation channel. The initial study was completed in 1991,with further <br /> enhancements completed in 1997, and 2002. <br /> C&D Deepening Study <br /> A 3D model of the Upper Chesapeake Bay, Chesapeake and Delaware Canal, and the <br /> Delaware River and Bay was developed to determine the impact on salinity, water <br /> supplies, and circulation due to deepening the C&D Canal and navigation channels in the <br /> two bays. The Z-plane version of the model called CH3D was employed. Year long <br /> simulations that covered a wide range of hydrologic conditions were made with and <br /> without channel deepening. <br /> Site 104 Sedimentation and Water Quality Study <br /> A numerical model study to determine the fate of material proposed for disposal at Site <br /> 104 in the Upper Chesapeake Bay, as well as, the impact of the disposed material on the <br /> water quality of the surrounding waters was conducted. A 3D numerical hydrodynamic <br /> model (CH3D) was employed to compute shear stresses for input to a dredged material <br /> mound-building model called MDFATE. In addition,the 3D hydrodynamic model <br /> provided flow fields to the 3D CEQUAL-ICM water quality model. <br /> Freshwater Bayou Channel Deepening Study <br /> This was a numerical modeling study for the New Orleans District of the US Army Corps <br /> of Engineers to determine the impact of channel deepening on shoaling and bank erosion <br /> in the Freshwater Bayou navigation channel located to the west of the Vermilion Bay in <br /> Louisiana. With the sediment being primarily fine-grained fluid mud, the CH3DZ-FM <br /> model previously developed to investigate sedimentation in the Atchafalaya Bar channel <br /> was applied. Plans call for deepening the existing 12 ft channel to 16 ft. An interesting <br /> feature is a salinity barrier lock located near the Gulf end of Freshwater Bayou. For the <br /> September 2001 —August 2002 time period, the lock was closed about 85% of the time. <br /> Thus, the Freshwater Bayou bar channel is effectively disconnected from the GIWW and <br /> Vermilion Bay most of the-time. <br /> Terrebonne Marsh Salinity Study <br /> This numerical model study was conducted for the Vicksburg District of the US Army <br /> Corps of Engineers. The three dimensional numerical model known as CH3DZ was <br /> applied to assess the impact on salinity in the Terrebonne Marsh as a result of <br /> implementing channel deepening in the Atchafalaya River and Bayous Chene, Boeuf, and <br /> Black. Year-long simulations were made for an average flow year and a low flow year <br /> with and without channel deepening. In addition, simulations were made with 50-year <br /> future bathymetry. Salinity contour plots were generated to illustrate the impact of <br /> channel deepening in the marsh and navigation channels. <br /> Billy H^Johnson <br />