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坡面土壤侵蚀过程不仅可以通过坡面的产流产沙过程反映,还可以通过降雨过程中坡面微地形变化特征来反映。对9°、12°、15°、20°、25°坡度下面积较小坡面模拟降雨,获取降雨过程中径流泥沙数据及降雨前后坡面微地形变化数据。结果显示:(1)初始产流时间随着坡度的增加先增加后减小,且初始产流时间较长;(2)15°、20°时的产流率不稳定,18min后产沙率规则性波动起伏;(3)随着坡度的增大,降雨过程后坡面比表面积值随着坡度的增大而增大,坡面的高程变异系数都有所增大。
Soil erosion process on slope can not only be reflected by the process of runoff and sediment production on the slope, but also reflected by the micro-topography change characteristics during rainfall. Rainfall was simulated on small slope at 9 °, 12 °, 15 °, 20 ° and 25 ° slope to obtain the data of runoff and sediment during rainfall and the microtopography data of slope before and after rainfall. The results showed that: (1) The initial runoff time first increased and then decreased with the increase of slope, and the initial runoff time was longer. (2) The runoff rate was unstable at 15 ° and 20 °. The sediment yield after 18 minutes Regular fluctuation; (3) With the increase of slope, the surface area value of slope increased with the increase of slope after rainfall, and the elevation variation coefficient of slope increased.