GIS支持下的河网密度提取及其在洪水危险性分析中的应用

GIS-based extraction of drainage network density and it's application to flood hazard analysis

流域结构特征包含着丰富的洪水危险性信息。本文主要分析流域结构特征的一个重要指标──河网密度与洪水危险性之间的关系，并重点探讨了ＧＩＳ支持下的河网密度自动提取方法，最后给出了辽河流域的实例分析．

Basin structural character contains much information about flood hazard. In this paper, an important index of basin structural character, drainage network density, has been analyzed, the rela- tion between drainage network density and flood hazard has been discussed and a new method of automatical extraction of drainage network density based on geographical information system has been suggested. In the end, a case study of Liaohe basin has been given.