基于SRTM DEM和ASTER GDEM的辽河流域河网提取研究

Research on Drainage Network Extraction in Liaohe Basin Based on SRTM DEM and ASTER GDEM

以SRTM DEM数据和ASTER GDEM作为基本的地形数据,借助Arc Hydro Tools扩展模块,研究基于地表径流漫流模型的数字河网水系提取方法,并对提取结果对比分析。研究显示,通过引入河网密度参数来确定集水面积阈值,提取结果与1∶25万地形图各级河网拟合程度较好,可运用于辽河流域山洪灾害风险评估模型的实际运行中。

In this study,SRTM DEM data and ASTER GDEM data were used as the basic topographic data,and Arc Hydro Tools was utilized for extension module so as to study on extracting digital drainage network of watershed based on surface runoff model,as well as to compare the two extraction results.The result showed that through the introduction of drainage density parameter to determine the river drainage area threshold,the both extracting drainages showed the goodness-of-fit with the factual drainage network on 1：250 000 scale topographic map,and the extracting digital river could be used in practical operation of the risk assessment model of mountain torrents disaster in Liaohe basin.