HR: 1330h
AN: H42E-1118    [PDF]
TI: Sedimentation Investigation of the Granite/Rhoads Creek Subwatershed, Delta-Clearwater River, Delta Junction, Alaska Using the Hydraulic Modeling Tool FLO-2D
AU: * Gasperi, J T
EM: joe.gasperi@wa.usda.gov
AF: U.S. Department of Agriculture, Natural Resources Conservation Service, 316 West Boone Avenue Suite 450, Spokane, WA 99201-2348 United States
AU: McClung, J M
EM: john.mcclung@wa.usda.gov
AF: U.S. Department of Agriculture, Natural Resources Conservation Service, 316 West Boone Avenue Suite 450, Spokane, WA 99201-2348 United States
AB: Concern in central Alaska over the impact of erosion and sedimentation in the Delta-Clearwater River watershed has prompted the U.S. Department of Agriculture, Natural Resources Conservation Service (NRCS) to evaluate sources and sinks of sediment within the watershed. In the spring of 2003, NRCS completed a sensitivity analysis on the Granite/Rhoads Creek subwatershed by evaluating existing data with FLO-2D, a two-dimensional flood routing model with a sediment transport component. A grid network covering an area of approximately 5,350 acres and containing 23,310 grid elements was overlain on a portion of the Granite/Rhoads Creek subwatershed in the area of interest. Four model scenarios were evaluated to represent a range of best and worst case watershed conditions. Two-dimensional plots of "net change in elevation" and "maximum velocity" by grid element were developed from each of the simulations and provide information on the geographic distribution of erosion and sedimentation within the modeled area. Processing of the model output has provided information on the relative severity of erosion in terms of sediment yield and rates of erosion.
DE: 1803 Anthropogenic effects
DE: 1815 Erosion and sedimentation
SC: Hydrology [H]
MN: 2003 Fall Meeting