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|Title:||HEC-RAS unsteady flow and sediment model of the Mississippi River : Tarbert Landing to the Gulf|
|Authors:||Dahl, Travis A.|
Heath, Ronald E.
Gibson, Stanford A.
Nygaard, Christopher J.
Mississippi River--Bed load
Mississippi River--Sediment transport
|Publisher:||United States. Army. Corps of Engineers. Mississippi Valley Division.|
United States. Mississippi River Commission.
Coastal and Hydraulics Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Series/Report no.:||MRG&P Report (Mississippi River Geomorphology and Potamology Program (U.S.)) ; no. MRG&P Report No. 25|
|Abstract:||An unsteady sediment model was developed for the Lower Mississippi River. This model was developed with the goal of providing an initial demonstration of the unsteady, movable bed features of Hydrologic Engineering Center-River Analysis System (HEC-RAS) 5.0.3 on the Mississippi River. The model simulated flow and bed change along the lower 323 miles of the Mississippi River, from Tarbert Landing, to a downstream Gulf of Mexico boundary condition, 18 miles downstream of Head of Passes. The modeling domain included 13 sub-reaches, simulating overbank inundation by diverting high flows over numerical lateral weirs into simulated floodplain channels. The unsteady hydraulic model was calibrated to water surface elevation at four internal gages, and sediment transport was calibrated to bed volume change between 2004 and 2012. The sediment calibration was also checked against internal concentration data and specific gage analyses at four gages. The model performed well, reproducing the bed volume change trend and concentrations.|
|Gov't Doc #:||MRG&P Report No. 25|
|Appears in Collections:||MRG&P Report|