The Parameters Regionalization Research Of The Excess Storage And Excess Infiltration Simultaneously Model

The determination of parameters is an important part of hydrological simulation modeling, but many parameters in almost all of watershed hydrological models cannot be directly ensured by observation test, which are related with the characteristics of river basin, but difficult to establish a direct relationship between them. As one of the large number of flood forecasting model, the infiltration excess and saturation excess simultaneously model takes into account various runoff model comprehensively, and forecast the flood more accurately, but its parameters are difficult to control and applicable scope has some limitations. The research of parameters regionalization not only can make parameter adjustment process easier, but also provide new ideas for the flood forecasting research in ungauged region.On the basis of infiltration excess and saturation excess compatible model, the mechanism analysis of model parameters was progressed and the influencing factors of parameters were found in this paper. Regard Luanchuan, Dong Wan and Nianyushan basin as the database basin, the correlativity between model parameters and the characteristics of basin underlying surface was established and the results of parameters regionalization ware applied to Yanshan reservoir basin.(1) The influencing factors of watershed runoff were quantified. The characteristics of basin underlying surface were extracted from DEM data, land use characteristics, soil and vegetation distribution. Then, according to the difference of water content and permeability, the corresponding impact value was given and soil assignment table was established.(2) The correlativity between model parameters and the characteristics of basin underlying surface was built. On the basis of qualitative and quantitative analysis of the model parameters and the relevant influence factors in database basin, the effect on model parameters with the change of the characteristic values in river basin was found, the correlativity was established and the formula was calculated.(3) The results of parameters regionalization ware applied to Yanshan reservoir basin. The model parameters value in Yanshan reservoir basin was derived, while flood forecasting results were obtained. The results showed that the simulation of last flood process was better, which can reflect the flood change process more fully and make precision reache a certain standard. The methods of parameters regionalization are feasible.