基于DEM的青龙河流域数字河网提取

摘要

Abastract:The paper briefly describes two methods of extracting river basins.With the Hydrology Analysis tools of ArcGIS, the principle and method of ground water overflow modelare well introduced,the process of which includes the flow direction, flow accumulation, drainage network andthedrainagenetworkextraction. Based on the Qinglong River watershed SRTM DEM data, the fact that the river networksturn out with different threshold values is discussed. And the extraction results were verified and in accordance with the basic national river network data.%简单叙述了流域河网提取的两种办法，并以ArcGIS为操作平台，介绍了基于坡面径流漫流模型的数字河网提取原理和方法，其流程可简单分为：DEM的预处理、水流流向的确定、汇流累积的计算以及河网生成。该文基于SRTM DEM数据以青龙河水域为研究对象进行流域特征信息提取，提取结果与国家河网数据基本吻合，并就不同阈值划分下的河网进行比较。