以重庆三峡库区为试验研究对象,论述基于数字高程模型提取流域水系的方法、原理。应用"burn-in"算法,对DEM进行再处理,即将发生河道偏差的平坦区域上的实际河网叠加到DEM中,对河道及河道两侧所在栅格单元高程值进行修正,重新生成流域河网。在原有DEM不作较大修改的前提下,使得生成的河网与实际河网更加匹配,同时也保证了模拟结果的准确性。
Taking three Gorges Reservoir area in Chonqing as study area, this paper discusses the methods and principles of extracting river network based on DEM. The "burn-in" method was used to re-process the DEM data. Firstly the true river network was overlaid on DEM, then through modifying the elevation of grid cells where river Channels were distributed, the new river network was generated again. Under the condition that DEM was not modified too much, the generated network matchs up to the true better. Meanwhile, the veracity of simlation results also have been ensured.
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