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湖泊科学  2003 

流域水系自动提取的方法和应用

DOI: 10.18307/2003.0303

Keywords: 水系,DEM,自动提取,集水区面积阈值,流域

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Abstract:

讨论由栅格数字高程模型(DEM)自动提取流域水系的原理和方法,并以西苕溪中上游流域为研究区进行了河网生成实验.研究表明:在山地丘陵区和平均地形坡度不小于3°的区域,所生成河网具有很高的可靠性.为了解决在平均地形坡度小于3°的平坦区域河网生成中产生的虚拟河网与自然水系偏差较大的问题,提出了利用主干河道和平原水系数字化作为约束条件的生成河网的方法,取得了与实际情况比较接近的结果,从而使水文要素的模拟更具有实际意义.

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