基于DEM流域河网水系提取研究——以晋江流域为例

Study on the Extraction of Drainage Network of Watershed Based on DEM——A Case Study of Jinjiang Watershed

文章简单介绍了基于DEM流域水系的提取原理、方法及过程,并在RiverTools2.4支持下,选择晋江流域作为提取实例.研究表明,同一流域选取不同集水面积阈值将得到不同的河网,通过分析河源密度与集水面积阈值之间的关系来确定合适的集水面积阈值.平均地形坡度大于3°的区域,所生成河网的可靠性比较高,而小于3°的平坦区域会产生了平行河流的问题.

The principle to extract the stream network based on DEM is introduced. The stream networks are extracted from DEM with different catchment threshold values based on RiverTools2.4. Through comparing the stream networks,it can be concluded that in the region of mean slope less than 3 degrees, the delineated stream need to be rectified compared with the natural stream networks.