基于SRTM DEM的盘龙河流域河网提取研究

河网、流域盆地的提取对于数字流域建立、流域水文分析等具有重要意义。基于SRTM DEM数据,采用ArcGIS 9.3平台下Hydrology工具提供的地表径流漫流模型,以中越国际河流———盘龙河流域为例,对水流方向、汇流累积量、河网水系及流域边界进行了提取。利用Google Earth和国家基础地理信息系统1∶400万河流资料进行验证.结果表明:基于DEM生成的数字水系与实际基本吻合,流域面积相对误差为1.32%,证明该模型具有较高的精度。

Extraction of drainage network in the Panlonghe River basin based on SRTM DEM

The extraction of drainage network and basin is of significance to the establishment of digital watershed and watershed hydrology analysis. Based on SRTM DEM data and ground water overflow model provided in the Hydrology tools of ArcGIS 9.3, the flow direction, flow accumulation, drainage network and basin boundary of the Panlonghe River basin were extracted. With the help of Google Earth and fac- tual drainage network on 1：4000000 scale downloaded from national fundamental geographic information system, the extraction of drainage network was verified and the results shows that the extraction results can match practice closely with 1.32% relative error of drainage area.