TOPMODEL在伊河上游洪水模拟中的应用研究

Study on Flood Simulation in Yi River based on TOPMODEL

本文采用引入超渗产流机制的综合TOPMODEL模拟伊河上游东湾以上流域的洪水过程。其中,利用Green-Ampt模型计算超渗产流,TOPMODEL被用来模拟动态饱和面积上的产流和基流。实际应用中,将整个流域划分为11个子流域,利用该综合模型模拟各子流域控制断面的流量,采用马斯京根法经河道演算至流域出口。将划分子流域并考虑超渗产流机制的综合TOPMODEL与不划分子流域的一般TOPMODEL进行了对比分析,结果表明,划分子流域的综合TOPMODEL计算结果相对更为合理。

The TOPMODEL, coupling with the infiltration excess mechanism, was used to simulate flood events in Dongwan basin in the upper stream of Yi River. The Green-Ampt model was used to calculate the infiltration excess runoff, then, TOPMODEL was used to simulate the runoff yield in the dynamic saturation areas and base flow. Sub-basins were divided according to DEM, and the model was used to simulate the hydrograph at outlet of each sub-basin. Muskingum method was used to route hydrograph of each sub-basin to the basin outlet. The results obtained from the above procedure were also compared to the results from a general TOPMODEL that was used to the basin without partition of sub-basins. It is shown that the TOPMODEL considering the infiltration excess mechanism is more reasonable for runoff simulation to the studied basin.