Distributed Watershed Concentration Flow Model Based on DEM

Allowing for catchment hydrological effect due to spatial variability of precipitation and underlying topography, the catchment is divided into a number of basic units of concentration flow within only one channel link by the method of natural divide. The basic unit of concentration flow is regarded as a V-shaped structure, and a distributed watershed concentration flow model is built on a series of V-shaped units of catchment. In the model, geomophologic instantaneous nit hydrograph based on area-time curve methodology is used to simulate overlanflow concentration, and Musking mothodology is used to simulate river flood routing. The model is applied in Xingfeng river basin and the result is reasonable.