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黄土高原地形破碎,地面倾斜度大,降水常在坡面上发生再分配。通过研究,已得到几点结论: 1、坡面接收雨量与坡度的关系式为P_a=Pcosasinβ〔见文中式(1)〕;2、坡面上降水不发生再分配的临界值,7°坡面为7毫米,15°坡面为4.3毫米,27.5°坡面为3.2毫米,30°坡面为2.8毫米;3、土壤蓄水量沿坡的变化规律是,旱季,在坡的中部土壤湿度最大,雨季末,自山顶至坡脚,土壤湿度逐渐变大。
The terrain of the Loess Plateau is fragmented and the slope of the ground is large. Precipitation often redistributes on the slope. Through the research, some conclusions have been obtained: (1) The relationship between rainfall receiving and slope is P_a = Pcosasinβ [see Chinese (1)]; 2, the critical value of precipitation redistribution does not occur on slope, The surface is 7 mm, the slope at 15 ° is 4.3 mm, the slope at 27.5 ° is 3.2 mm, and the slope at 30 ° is 2.8 mm. 3. The change law of soil water storage along the slope is that in the dry season, The largest, the end of the rainy season, from the top of the hill to the foot, soil moisture gradually becomes larger.