黄河多沙支流暴雨产沙模型

Sediment Yield Model of Heavy Rainfall of Hyper-sediment Concentrated Tributaries of the Yellow River

Almost all the sediment yield models of heavy rainfall built in recent years have adopted the assumption of sediment transport concentration of gullies and rivers being equal to 1.Through the analysis on runoff/sediment relationship, characteristics of sediment transport and sediment transport concentration of gullics and rivers in gullied rolling loess area and coarse-sand area, the non-constant unequilibrium sediment transport model of one-dimensional open channel is applied into the middle reaches for calculating the processes of runoff and sediment and the amount of aggradation and degradation at any section when the sediment transport concentration is not equal to 1.The model is tested and verified by an event of major flood occurred in the Kuye River.The result shows good.The paper puts forward through the analysis that sediment yield model of heavy rainfall of a large river basin must be built on a mixed model of taking hydrology and dynamics of streams as a theoretical basis.