基于 DEM 的青海省西宁市地区河网流域特征自动提取

摘要

为获得青海省西宁市地区的河网特征，应用 ArcGIS10软件中的水文分析工具，基于美国联邦地质调查局（USGS）的 SRTM3 DEM 数字高程模型数据提取了研究区域水流流向、汇流累计量及河网水系等流域特征信息，进行了河网分级及子流域划分，并将提取结果与研究区遥感影像图进行对比。结果表明：基于 DEM 数据提取河网流域特征与实际自然水系的特征较为吻合，可作为一种流域水文分析的优良方法。研究结果可以为流域规划及流域综合治理提供参考。%In order to obtain the stream network and its characteristics of Xining city in Qinghai province ,ArcGIS10 hy-drological analysis software was applied in this research .Flow direction ,flow accumulation and river system of stream net-work were extracted based on the SRTM3 DEM data ,and river network classification and the sub-watershed were also proceeded .The results were compared with the remote sensing image ,and it showed that river basin characteristics of stream network agreed well with the practical water system .This research can provide reference for comprehensive river basin planning and treatment .