中文摘要：

基于淮河流域的地形、岩石地质类型等空间分布特征，对陆面—水文耦合模式CLHMS1.0（Coupled Land Surface？Hydrological Model version 1.0）的河道曼宁糙率系数、水力传导度两个关键参数进行了率定；在此基础上，通过基于CLHMS1.0的多组敏感性试验，分析了河道曼宁糙率系数、水力传导度对CLHMS1.0模拟淮河流域水文过程的影响。研究结果表明，淮河流域上游王家坝子流域曼宁糙率系数的减小，可以显著提高模式对王家坝水文控制站上游模拟的水流流速，减小了模式对王家坝洪峰来临时间模拟偏迟的误差；依据淮河不同子流域的岩石地质类型选定更为合理的水力传导度参数后，模式对淮河流域河道流量等水文过程的模拟更为准确。利用参数率定后的CLHMS1.0对淮河流域1980～1987年逐日水文过程进行了模拟，与观测实况比较结果表明，采用了新的河道曼宁糙率系数和水力传导度参数后，模式对淮河流域逐日水文过程的模拟能力显著提高，且可以更合理地模拟出地表产流和地下水补给对流域河道流量的相对贡献。

英文摘要：

Topographical and hydrogeological information in the Huaihe River basin are used to calibrate the manning’s roughness and hydrologic conductivity parameters in the Coupled Land Surface-Hydrological Model version 1.0 （CLHMS1.0）. The impacts of these two parameters on the model performance in simulating the observed hydrological processes over the Huaihe River basin are investigated by different sets of sensitivity experiments using the CLHMS1.0. It is revealed that a decrease in manning’s roughness in the Wangjiaba sub-basin leads to a significant increase in thesimulated water flow velocity, which in turn improves the model simulated peak time of streamflow at Wangjiaba station. Meanwhile, a more reasonable database for hydrologic conductivity over the Huaihe River basin will lead to improvement of the model＇s capability in simulating the observed magnitude of the streamflow. The daily streamflow hydrograph in the Huaihe River basin during 1980-1987 is simulated using the improved CLHMS with calibrated manning＇s roughness and hydrologic conductivity parameters, it is found that the improved CLHMS1.0 can more accurately simulate the observed daily hydrological process. Moreover, the relative contributions of surface runoff and underground water supply to the observed streamflow in the Huaihe River basin have been more reasonably simulated by the improved model when compared with the observation.