By the method used in 13, 32, one can estimate the mean depth d and the effective length l in each grid . the slope of the aquifer can also be calculated through an analysis of the digital elevation model . the two parameters a and b in the quasi-steady subsurface model can be calculated by the following method : the nonlinearity parameter b is taken to be 2.0, the parameter a can be calculated by plotting the values for dq dt versus q in a log-log graph 13 同时将一种非常典型的“拟稳定”状态的地下图图3a三种入渗的时间序列;b三种入渗对应的地下径流深的变化以及ddsitqst?注意这径流机制13,31里的只是s的函数也耦合到clm里,并应用到该流域进行模拟实验
Next, we will apply this new versioned clm to a river basin at xixian station in the huaihe river basin . xixian station is a hydrological observation station, which covers 10190 km2 . we use 11-year from janu-ary 1980 to december 1990 observed meteorological data and runoff data including surface runoff and subsurface runoff to validate the reliability of this new subsurface model, and furthermore a quasi-steady subsurface runoff model 13, 31 bqas and dsitqsdt is also applied to this region to perform a comparison simulation 利用包含上述地下径流机制的clm应用到实际的流域中,选取淮河流域的息县站所控制的流域作为实验区域图4.息县站是淮河流域的一个水文观测站,控制面积为10190km2,利用该区域11年1980年1月到1990年12月的降水气温等气象资料以及径流包括地表径流和地下径流资料来验证所建立的模型的可靠性