基于DEM的渭河大流域特征分块提取方法

受流域面积、DEM数据尺度、数据量和计算机性能的影响,无法直接整块提取大流域特征。对此,以渭河流域为研究区,基于DEM数据,依据坡面流模拟方法,使用ArcGIS软件中的水文分析工具,分块提取流域特征,再对提取的信息进行合并,衔接断裂河流和破碎的集水区,并通过拓扑处理,生成完整的流域数据。对比发现,提取的河网与实际河网较吻合,提取的流域面积精度较高,从而验证了该提取方法的可行性。

Block Extraction Method of Weihe Large Basin Characteristics Based on DEM

The large basin characteristics extraction will be affected by drainage area, the scale and volume of DEM data, and computer performance. As a consequence, it is difficult to extract the whole of large watershed characteristics directly. In this study, we selected the Weihe basin to do experiment. According to the method of flow simulation of surface runoff combined with the tool of hydrological analysis in ArcGIS software based on the DEM data, block extraction of hydrological characteristics in Weihe basin were implemented. Then the extracted information was merged, and the fractured rivers and broken basin were connected. By topology processing, the complete basin data was generated. Comparison analysis shows that the extraction of drainage is consistent with the actual drainage, and the extraction of basin has higher precision. So, the feasibility of the proposed extraction method is verified.