基于DEM的河网提取方法对比分析

Comparative Analysis of Methods Deriving Drainage Network Based DEM

对由RiverTools和Arc/Info提取的流域河网特征进行对比分析,两种方法得到的河网比较一致,但是分水线,特别是计算的流域面积差别较大,RiverTools的计算结果更接近实际情况。Arc/Info的可视化程度高,有利于问题的分析。在流域水文研究,特别是水文模拟研究中可将两种方法结合起来。

Drainage networks for the Yandu River basin are derived by use of ARC/INFO and River Tools based on the digitalelevation models（DEMs）, and comparative analysis is made. It is shown that there is almost no different between drainage networks derived by two methods, but divides and areas are different. It can be seen that the results of RiverTools are good, but the results of ARC/INFO may be visual easily. It is suggested that the two methods can be used together in watershed hydrologic modeling.