新安江模型自由水容量参数栅格化方法研究

Study on Free Water Capacity Paramete Grigzation Method of Xin'anjiang Model

针对新安江模型中自由水蓄水容量参数SM反映土壤重力水蓄水能力并对地面径流和地下径流的比重起决定性的作用,利用土地覆盖资料及DEM数据获取流域林地面积比与坡度信息在SM、林地面积比、坡度三变量间作回归分析,分别建立一元、二元线性回归方程,将计算获得的各栅格SM应用于栅格化新安江模型中获得了较好的模拟效果,为无资料地区参数的确定提供了可行的方法,具有一定的新意。

SM,free water capacity parameter in the Xin＇anjiang（XAJ） model,reflects the gravity water storage capacity, which plays a decisive role in the proportion of surface runoff and groundwater runoff. It is a sensitive parameter. The physical sense of SM shows that the value of the properties is associated with the surface. We use the land use and land cover information and DEM Data to extract basin forest area ratio and slope,analyze the trends of variables in the SM, use forest area ratio and the slope to do regression analysis, and establish two linear regression equations and a dual linear regression equation respectively. The grid SM which is calculated through the equation is used in grid-based Xiffanjiang model, and it gives good simulation results. It provides a workable solution to determine the parameters of the ungauged basin.