基于GIS和DEM的洋河流域水文特征提取方法研究

Hydrology Information Extracting of Yang River Watershed Based On GIS and DEM

利用ARCGIS软件的Hydrology扩展模块,以张家口洋河流域为例,探讨了数字高程模型(DEM)的处理及其水文分析方法,介绍了其基本原理.对河北省1∶25万的DEM进行图幅剪裁等预处理,生成了洋河流域数字高程模型.基于DEM和GIS进行流域的水文模拟分析,包括下垫面计算、水流方向计算、水量计算、流网提取,最后进行了洋河全流域界线的划分并确定流域面积,生成了洋河数字流域.

The treatment and hydrology simulation analysis of digital elevation model （DEM） were discussed using ARCGIS software and its hydrology tools extension with an example of the Yang River watershed. The digital elevation model of the Yang River watershed was generated through map, and separation of the DEM maps of the Hebei province. The hydrological simulation was conducted based on DEM and GIS, for the major processes of lowland water infilling, calculation of water flow direction, water flow accumulation, and water network extraction. Finally, the digital watershed was generated through separations of the whole watershed and the sub-watersheds of the Yang River watershed.