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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。
Due to the influence of catchment area, DEM data scale, data volume and computer performance, it is impossible to extract the features of the whole catchment directly. In this paper, based on DEM data and based on DEM data, hydrological analysis tools in ArcGIS software are used to study the characteristics of watersheds in a block-by-block basis, and then the extracted information is combined to connect the fractured rivers and the fractured Catchment, and through topology processing, generate complete watershed data. The comparison shows that the extracted river network is in good agreement with the actual river network, and the accuracy of the extracted basin area is high, thus verifying the feasibility of the extraction method.