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鉴于坡度和降雨强度的变化对坡面侵蚀产沙过程影响明显,通过设计室内大型试验土槽,采用室内人工模拟降雨的方法,对不同坡度和降雨强度下坡面侵蚀输沙动态过程进行试验研究。结果表明,在降雨强度不变的条件下,累计产沙量、输沙率随坡面坡度增大而增大;同一坡度下累计产沙量、输沙率随降雨强度的增加而增加;输沙率与降雨强度呈线性关系,与坡度呈幂函数关系。进而基于试验结果,通过二元非线性回归,建立了输沙率、单位面积单位时间产沙量、坡度及降雨强度之间的经验公式。
In view of the obvious influence of slope and rainfall intensity on the process of slope erosion and sediment yield, the dynamic process of slope erosion and sediment transport under different gradient and rainfall intensity is studied by means of indoor artificial rainfall test . The results show that under the condition of constant rainfall intensity, the cumulative sediment yield and sediment transport rate increase with the increase of slope gradient. The cumulative sediment yield and sediment transport rate increase with the increase of rainfall intensity under the same gradient The sand rate is linear with the rainfall intensity and shows a power function relationship with the slope. Based on the test results, an empirical formula between sediment yield, sediment yield per unit area per unit time, slope and rainfall intensity was established by binary nonlinear regression.