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土壤的侵蚀和流失既有联系又有区别,土壤的流失更具有地域性。土壤坡面的流失量,在其它条件相同时,主要由坡度和坡长确定。坡度和坡长在山丘流失区随处变化,因此,坡度坡长因子值的确定也很困难。本文根据长江三峡地区的调查材料,导出了求取坡度因子和坡长因子值的公式,它们分别是: S=0.149·1.1~B L=h·(1-cosB)/63.8sinB 地形因子值的求取公式就写成; LS=0.00233·1.1~B·h(1-cosB)/sinB 根据这个公式就可以求得长江三峡区的地形因子值。
Soil erosion and loss are both linked and different, soil erosion is more regional. The amount of soil slope loss, when other conditions are the same, is mainly determined by the slope and slope length. The slope and slope length vary from place to place in the area. Therefore, it is very difficult to determine the value of the length factor of slope. Based on the survey data in the Three Gorges area of the Yangtze River, this paper derives the formula for calculating the slope factor and slope length factor values, which are respectively as follows: S = 0.149 · 1.1 ~ BL = h · (1-cosB) /63.8sinB Take the formula is written; LS = 0.00233 · 1.1 ~ B · h (1-cosB) / sinB According to this formula can be obtained in the Three Gorges area of the terrain factor value.