汉江流域数字河网的构建

Construction of Hydro Networks in the Hanjiang Basin

介绍了自动提取数字河网的常用方法和不足,阐述了利用DEM和DRLN(digital river and lake network)的改进算法的基本思路。基于全球陆地一公里基础高程GLOBE数据,利用遥感影像获得的自然流域水系矢量数据对DEM进行重新处理,自动提取了汉江流域的数字河网,能够有效避免了原始DEM可能造成的错误。最后,利用ArcHydro工具构建了具有拓扑关系的水文网络,从而为进一步开展汉江流域分布式水文模拟和计算以及水资源优化配置等分析提供了充足的空间信息。

A brief review was made on automated extraction of drainage network from grid digital elevation model and the problem of D8 approach. The approach of extraction of drainage network by using a digital elevation model and a digital river and lake network was mainly presented. This approach was improved based on some problem of it. And the improved approach was applied to Hanjiang catchment. And it can avoid the possible error of D8 approach effectively. The improved approach will be beneficial to offering ample information for distributed hydrological, models and the analysis of water resource.