基于Holtan产流的分布式水文模型

基于GIS与DEM技术,构建基于Holtan产流的分布式水文模型(Grid-Holtan模型)。模型以栅格为计算单元,栅格产流采用基于Holtan下渗方法的超渗产流计算,坡面汇流和河道汇流均采用逐栅格的一维扩散波水流演算模型模拟。将Grid-Holtan模型、陕北模型与新安江模型应用于半干旱的沁河孔家坡流域。结果表明,Grid-Holtan模型、陕北模型的模拟效果好于新安江模型,GridHoltan模型洪峰模拟效果更好。

A distributed hydrological model based on Holtan runoff generation theory

Using the GIS and DEM techniques, a distributed hydrological model based on a runoff generation theory(the Grid-Holtan model)was developed. For each computational cell, the infiltration-excess runoff was calculated with the Holtan infiltration method, and the overland flow and river flow routing were simulated with the one-dimensional diffusion wave model. The Grid-Holtan model, Shanbei model, and Xinanjiang model were applied to the Kongjiapo Catchment of the Qinhe Basin, in China. The results show that the Grid-Holtan model and Shanbei model perform better in flood simulation than the Xinanjiang model, while the flood peak simulation accuracy of the Grid-Holtan model is higher.