基于栅格的分布式SCS产流模型研究

利用基于栅格分布的土地利用类型和土壤类型,构建了一个基于栅格的分布式SCS产流模型,该改进模型能够较好地考虑流域下垫面的空间分布及降雨空间分布的不均匀性,并将其应用到实际的流域中.模拟结果表明,改进后的基于栅格的SCS模型比原始的SCS模型的模拟精度明显提高.在共44场降雨中,产流模拟精度达到85%以上的场次由原来的12场提高到26场.并且通过该改进模型可以得出次降雨的空间分布式的产流分布图,可为流域的水管理提供更为准确的产流信息.

Raster-based Distributed SCS Runoff Model

By using the raster data of landuse and soil types,this paper builds a raster-based SCS model,which in turn enables the improved model to make a better consideration of the heterogeneity of watershed underlying surface and the heterogeneity of rainfall. In addition,this paper applies the new model in a real watershed,result from which shows that simulation accuracy can be significantly improved by the raster-based SCS model,compared with the original SCS model. Among the 44 rainfall events in total,the number of the rainfall with a runoff simulation accuracy of above 85% increases from 12 to 26. What's more,runoff distribution maps are obtained using the improved model,which help provide more accurate runoff information on the water management of watershed.