Limitations of Modeling High Concentration Streamsby Karl W. Eriksen, U.S. Army Corps of Engineers, United States,
Abstract: Following the 1980 eruption of Mount St. Helens, high sediment concentrations caused rapid deposition and increased flood hazards along the Cowlitz River. The Corps of Engineers developed a number of sediment transport models for the Cowlitz and Toutle rivers to analyze sediment movement and evaluate sediment control measures. The Corps' HEC-6 sediment transport computer program using the B.R. Colby or F.R. Toffaleti sediment transport equations was used in this work. While these models were useful for comparing alternatives, they had limitations that precluded reproduction of observed conditions. These limitations can be grouped into; data availability, equation performance, and HEC-6 model structure.
Subject Headings: Sediment transport | Rivers and streams | Computer software | Data processing | Floods | Transportation engineering
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