中文摘要：

以vanGenuchten模型表述的土壤水分特征曲线为基础，推导出流域单点缺水量，并结合TOPMODEL模型中地形指数与地下水位关系，建立了反映地形和土壤特征共同影响的蓄水容量模型，通过统计方法从栅格尺度蓄水容量获得流域尺度蓄水容量曲线，取代传统新安江模型中率定的蓄水容量曲线。以淮河流域紫罗山子流域为例，分析地形特征与土壤类型对蓄水容量的影响；并与实测流量过程以及原新安江模型模拟的流量过程对比，表明模型能较好地模拟场次洪水过程。模型将蓄水容量曲线显式表述，减少了新安江模型参数，为无资料地区的水文模拟提供了分析方法。

英文摘要：

The deficit in soil moisture or soil moisture storage capacity for a particular point is estimated based on the van Genuchten soil water characteristic curve model. The deficit is then used together with the relationship between the depth to groundwater table and the TOPMODEL topographic index in the development of a watershed storage ca- pacity model taking into account the effect of soil properties and topography. Based on statistical analysis of the storage capacity of each grid point, the watershed storage capacity curve can be obtained. The watershed-scale capacity curve is used to replace the calibrated storage capacity curve of the traditional Xin＇anjiang model. The Ziluosha sub-basin of Huaihe River basin is chosen as a test site to validate the new model and to study the influence of terrain and soil types on the watershed storage capacity. Results show that the new model can better simulate the event-based flood hydro- graph compared to that obtained with the traditional Xin＇anjiang model. The use of an explicit formula for the storage capacity in the new model reduces the number of user calibrated parameters in the traditional Xin＇anjiang model, which provides a new tool for hydrological simulation in ungauged basins.