基于DEM的流域数字河网提取算法研究  

Research on the Algorithms of the Digital Channel Network Extraction Based on Digital Elevation Model

作　　者：沈中原[1] 李占斌[1,2] 李鹏[1] 武金慧[3] 

机构地区：[1]西安理工大学西北水资源与环境生态教育部重点实验室,陕西西安710048 [2]黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [3]中国水电顾问集团西北勘测设计研究院,陕西西安710065

出　　处：《水资源与水工程学报》2009年第1期20-23,28,共5页Journal of Water Resources and Water Engineering

基　　金："十一五"国家科技支撑计划(2006BAD09B02);国家重点基础研究发展规划项目(2007CB407206);西安理工大学优秀博士学位论文基金(207-210010)资助

摘　　要：以G IS为平台,介绍了基于地表径流漫流模型的流域河网提取算法与流程。根据DEM数据特点,通过洼地的识别和填充、平地的抬升、水流方向的确定、水流累积矩阵的确定、河流栅格网络的生成、河网水系的生成以及子流域的分割等过程,实现了流域河网特征的提取,得到了数字流域矢量图。以西安市氵产灞河流域为研究对象,采用NA SA提供的90m分辨率的SRTM-DEM为基本的地形数据,进行流域特征信息的提取。经计算得到的研究区域河网特征以及流域信息与实际河流水系特征及流域信息基本吻合,认为基于地表漫流模型的流域数字河网提取算法,结果合理可信,能够满足科学研究和实际工程的应用。Based on geographic information system （GIS） and the surface runoff model, the algorithms and programme for extracting the channel network was introduced. The terrain characters of topography based on the DEM were analyzed in this paper. According to the characteristics of DEM data, through the procedures distinguished from billabong and filling, uplifting the flat land, determining the direction of water course and the stream accumulated matrix, the extraction of the river grid network and water system was realized and the digital vectorgraph of the watershed was obtained. The Chanba River Watershed flowing through Xi＇an City was taken as a research object for channel network extraction. Using the basical land data supplied for SRTMDEM being 90m resolving power by NASA. The channel network extration from DEM was basically consistent with the factual water system. The results showed that this method can be used in practical scientific research and hydrological analysis.

关 键 词：河网提取 数字地面模型 数字流域 水系 

分 类 号：S157[农业科学—土壤学]