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坡长是USLE/RUSLE应用到流域尺度上较难提取的因子。本文从理论上对坡长进行分析,提出以流域分布式侵蚀坡长来反映地形因子的坡长值,并采用迭代累积的算法提取坡长,同时考虑了侵蚀、沉积、沟道,较完整地实现了坡长的计算条件。对实例进行计算、分析,并同已有估算方法进行了对比。该方法有效地表达了坡长与地形的相关关系,计算结果准确,空间分布合理,适合于在流域和区域尺度上基于DEM对地形因子进行提取与分析。
Slope length is a factor that is more difficult to extract from the USLE / RUSLE basin scale. In this paper, the slope length is theoretically analyzed, and the slope length of the topography factor is proposed to reflect the slope length of the topography factor. The iterative accumulation algorithm is used to extract the slope length. Erosion, sedimentation, channel, and more complete Achieved slope length calculation conditions. The examples are calculated, analyzed and compared with the existing estimation methods. The method effectively expresses the correlation between slope length and topography. The calculation results are accurate and the spatial distribution is reasonable. It is suitable for extracting and analyzing the topographic factors based on DEM at watershed and regional scale.