Dynamic Modelling of Suspended Sediment Transport in Streams as a Function of Sediment Supply

摘要

Sediment supplies and stream discharge together determine the patterns, over time, of suspended sediment loads in small streams. Most of the uncertainty in empirical streamflow-sediment relationships can be attributed to changing supplies. The authors transport model augments the commonly used power function relating suspended sediment concentration, C, to stream discharge, Q, by inclusion of a variable S representing sediment stored in the channel system. The resulting supply-based model was calibrated to concentration and streamflow time series data from four storm events in a small, forested watershed in coastal Oregon as well as to data from a controlled reservoir release in Utah, during which streamflow was held constant for an extended period.