中文摘要：

基于栅格型DEM数据的数字河网水系提取技术为分布式水文模型的建立并应用提供了保障和基础。DEM水平分辨率不仅影响数字河网水系提取的结果，而且直接关系到水文模型计算单元的尺度。采用具有自主知识产权的数字河网水系提取软件DigitalHydro，以淮河史灌河流域黄泥庄站以上为研究对象，分析不同分辨率DEM数据对提取的流域特征的影响的变化趋势。研究表明，随着DEM分辨率的降低，流域地形被坦化，径流汇水长度变小，流域面积有增大的趋势。

英文摘要：

The digital drainage network extraction method provides a basic technique for the establishment of basin-scale hydrological model. The horizontal resolution of DEM affects both the results of digital drainage network extraction and the sub-basin scale of hydrological model. In this paper, the trends of digital drainage network extraction affected by DEM resolution are analyzed by using the software package. Digital Hydrological watershed which is a sub-basin of the Shiguanhe River. It shows that the terrain tends to be much flatter, the flow length are shorter and the basin areas are much larger with the decrease in the horizontal resolution of DEM.