摘要
基于DEM提取河网流域的基本原理以及将数字化水系的位置信息作为流域河网提取的限制条件,对主要河道的DEM值进行修改,然后设定不同的集水面积阈值提取相应的河网。根据河网密度与集水面积阈值的关系,利用均值变点分析方法,最终确定合理的集水面积阈值。结果表明使用该方法提取的河网流域更加接近真实水系。
According to the basic method for extracting the fiver channel network of watershed based on DEM and taking the digital fiver system＇ s catchment properties as controlling factors, the DEM values of main fiver channels are revised. In addition, the different DEM-based fiver network is extracted by varying catchment area threshold. At the same time, based on the relation of the fiver network density and catchment area threshold, the method of change-point analysis is used to produce an ideal catchment area threshold. The results show that the fiver network watershed extracted by this method would fit well with the actual fiver system.
出处
《水利与建筑工程学报》
2013年第2期123-126,共4页
Journal of Water Resources and Architectural Engineering
关键词
DEM
数字化水系
河网提取
变点分析
DEM
digital river system
river network extraction
change-point analysis
