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中文摘要：
为了探讨基于物理基础的分布式水文模型在国内半干旱半湿润流域的应用．研究模型径流模拟在中小尺度流域的合理性与适用性，采用基于连续栅格单元演算的分布式水文模型CASC2D，对县北沟流域1983年-2007年8场洪水和栾川流域1961年-1998年8场洪水进行了径流模拟。对模拟精度、特征值等方面进行的比较分析结果表明，模型在县北沟流域和栾川流域均取得较好的模拟效果，且县北沟流域的模拟效果比栾川流域好；模型适用于中小尺度的半干旱半湿润流域，在超渗产流与混合产流流域均能取得较高的精度。
英文摘要：
In order to understand the application of physically-based distributed hydrological model in semi-arid and semi-humid basin and the applicability and rationality of runoff model in medium-small scale, a physically distributed hydrological model CASC2D which is based on grid unit is adopted to simulate 8 flood events in Xianbeigou Watershed from 1983 to 1987 and 8 flood events in Luanchuan Basin from 1961 to 1998 respectively. The simulation accuracy and runoff statistical values are then compared. The results show that： （a） the CASC2D can be used to the runoff simulation of Xianbeigou Watershed and Luanchuan Basin and has relatively higher accuracy, and the simulation effect of Xianbeigou is better than Luanchuarg and （b） the model applied to semi-arid and semi-humid basin with a medium-small scale is applicable and can achieve a higher accuracy both in infiltration excess and mixed runoff regions.
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