基于栅格的分布式超渗产流水文模型构建及比较

利用具有物理机制的Green-Ampt下渗方法并考虑降雨间歇土壤含水量再分配计算栅格内产流;同时考虑河道排水网络的水量交换,采用逐栅格的Muskingum-Cunge演算法进行汇流,构建了基于栅格的分布式超渗产流水文模型(Grid-GA模型).同时还建立了基于子流域的Green-Ampt水文模型、以及增加超渗产流机制的新安江模型.将这3个模型以及新安江模型应用于半湿润的沂河高里流域,结果表明,4个水文模型均能很好地进行水文过程的模拟,证明所构建的模型结构合理.

Development and comparison of Grid-based distributed hydrological models for excess-infiltration runoffs

A DEM Grid-based distributed hydrological model (Grid-GA model) for excess infiltration runoffs was developed. The Green-Ampt infiltration method was applied in the model and the redistribution of water content in soils was considered. The Grid-based Muskingum-Cunge flow routing method was employed to route the flows of the whole basin. The water exchange of the river drainage network was considered. The Grid-GA model, the sub-basin-based Green-Ampt model, the Xin'anjiang model with the excess infiltration mechanism and the Xinanjiang model were applied to Gaoli basin in Yi River, China. The results show that the above 4 models can satisfactorily simulate the hydrological process of the river basin. The rationality of the proposed model is validated.