Simulating Long-Term Sedimentation Trends on the Lower Mississippi Riverby Ronald R. Copeland, US Army Engineer Waterways, Experiment Station, United States,
Abstract: A one-dimensional numerical model was used to determine long-term aggradation and degradation trends in the lower Mississippi River. Geometry in the model came from hydrographic surveys. Average roughness was determined by adjusting Manning's roughness coefficients to simulate average stage-discharge curves at several gages. Suspended sediment measurements at the upstream boundary were used to determine sediment inflow into the numerical model. The initial bed material gradation was unknown and was adjusted in the numerical model until measured bed volume changes were simulated. The numerical model was then used to predict future degradation and aggradation trends.
Subject Headings: Sediment | Numerical models | Hydrologic models | Rivers and streams | Chemical degradation | Bed materials | Hydraulic roughness | Suspended sediment | Mississippi River
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