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Modeling Sediment Yield Affected by In-Stream Sand Mining

by Howard H. Chang, San Diego State Univ, San Diego, CA, USA,
Robert C. MacArthur, San Diego State Univ, San Diego, CA, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

Sediment yield refers to the amount of sediment having passed a given river section for a specified duration. While sediment will be stored in the borrow pit, it will also be depleted from channel boundaries during headward and downstream erosion. The FLUVIAL model was employed to study the morphological changes of the San Luis Rey River induced by in-stream sand mining. Spatial and time variations of sediment yield along the study reach during a 100-year flood were obtained. The study illustrates how channel storage (and depletion), a major factor affecting sediment yield, can be quantified by an erodible boundary model but not an erodible bed model.

Subject Headings: Sediment | Rivers and streams | Sand (hydraulic) | Streamflow | Mathematical models | Water storage | Sandy soils

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