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MODELING sediment PROCESSES ON SMALL watersheds:A CONCEPTUAL FRAMEWORK Ⅰ. BROAD SHALLOW FLOW PROCESSE

International Journal of sediment Research 1992年第3期 21-44页

作者： Vicente L. LOPES Assistant Professor, School of Renewable Natural Resources, The University of Arizona, Tucson, Arizona, 85721 Peter F. FFOLLIOTT Professor, School of Renewable Natural Resources, The University of Arizona, 85721

A conceptual modeling framework for developing process-based mathematical models of sediment generation, transport, and deposition on broad shallow flow areas is presented. The governing equations relevant to process-based modeling of broad shallow flow sediment processes on small watersheds are presented and the effects of space and time averaging on the predictive equations are described. Starting from the most general one-dimensional, unsteady model of sediment processes, simpler model structures are obtained and the successive simplifications made on the governing equations in order to obtain simpler and less detailed formulations are described. Specific model formulations are given for illustrative purposes and applications of these models to erosion and sediment yield prediction from broad shallow flow areas are shown using sediment data from rainfall simulator plots. In spite of some progress made in the development of process-based erosion and sediment yield models from broad shallow flow areas, further developmental modeling efforts must be based on a clear separation between hydrologic and hydraulic processes, and the soil properties which are significant for each.

关键词： erosion and sediment yield, upland watersheds Broad shallow flow processes Conceptual modeling framework Governing equations Space-time averaging.

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