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探讨了典型黑土区基于单位汇水面积的LS因子算法与传统基于径流路径长度算法的差异。研究表明,在研究区坡长坡缓的地形条件下,基于单位汇水面积的LS因子算法值普遍要大于基于径流路径长度算法的LS因子值;在有限的坡度范围内,不同算法的坡度因子相差不大,与之相比,不同算法的坡长因子值差别明显,特别是对于坡长指数采用定值的Govers算法更是如此。这说明在研究区坡长坡缓的地形条件下,坡长因子对LS因子算法的响应更为敏感。同时,侵蚀机理分析得出,坡长因子指数采用与坡度有关的变值更为合理,特别是在采用DEM进行大范围土壤侵蚀量预测时更应如此。
This paper discusses the difference between LS factor algorithm based on unit catchment area and traditional runoff path length algorithm in typical black soil area. The results show that the LS factor based on the unit catchment area is generally larger than the LS factor based on the runoff path length algorithm under the condition of long slope and gentle slope in the study area. In a limited range of slope, the slope factor Compared with them, the slope length factor values of different algorithms are obviously different, especially for the Govers algorithm which adopts the fixed value of slope length index. This indicates that the slope length factor is more sensitive to the LS factor algorithm under the topography of slope length slope in the study area. At the same time, the analysis of erosion mechanism shows that it is more reasonable to use the grade-dependent variation of slope length factor index, especially when using DEM to predict the amount of soil erosion.