由DEM确定Nash汇流模型的参数

针对推求Nash汇流模型参数的传统方法中需要有足够数量的流域降雨径流资料，而目前在大部分地区并没有足够的水文资料这一情况，提出了一种确定Nash模型参数的新方法．首先由DEM提取地形地貌参数，然后推算Nash模型的参数．选择长江三峡沿渡河流域为例进行模拟计算，取得了较好的效果，表明本文方法在实用上是可行的，完全避开了大量降雨径流资料的处理和分析，有助于进一步深化缺少资料情况下汇流计算方法的研究．

Determination of parameters for Nash runoff model by DEM

In the conventional method for determination of the parameters of the Nash runoff model, a large amount of precipitation and runoff data are needed. However, many areas of China are always short of sufficient hydrological data. Aiming at the above fact, a new method is developed for parameter determination. First, the geomorphic parameters are derived by the DEM, and then the parameters of the Nash model are deduced. Numerical simulation for the Yanduhe River basin at the Three Gorges of the Yangtze River shows that the present method is applicable. The present model avoids the processing and analysis of large amounts of precipitation and runoff data, and is helpful to further research of the calculating method for runoff in the absence of precipitation and runoff data.