基于 DEM 的流域分割及子流域分类

摘要

In the background of digital watershed,based on DEM data,taking Sanchuan River basin as a research object,applying GIS technology, the principles and methods of basin segmentation and sub-basin classification were discussed;automated extraction of river network and basin seg-mentation were realized;basin area,drainage density and basin shape were selected as the main classifying factor of sub-basin,through the method of hierarchical classification,sub-basin classifying standard system was built,52 sub-basins were divided into eight types.%在流域数字化的大背景下，基于 DEM 数据，以三川河流域为研究对象，应用 GIS 技术，探讨了流域分割及分类的原理和方法；实现了流域河网的自动提取及流域的分割；选取流域面积、河网密度及形状系数为分类因子，采用分层分类方法构建了子流域分类框架体系，并将得到的52个子流域划分为8种类型。