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通过不同降雨强度的模拟降雨试验,研究了15°时坡面坡长对黄土坡面侵蚀—搬运过程的影响。结果表明,坡面径流量随坡长的增加而增加,在50和75 mm/h降雨强度下,坡面径流量随坡长增加的幅度基本相同。在100 mm/h降雨强度下,当坡长小于5 m时,坡面径流量随坡长的增加幅度较小,而当坡长大于5 m时,坡面径流量随坡长增加的速率明显增大。在8 m坡长内,坡面侵蚀量随坡长变化呈波状起伏的交替变化;随坡长增加,坡面侵蚀现象呈现以侵蚀—搬运过程为主与以侵蚀—沉积过程为主的交替现象。
Through simulated rainfall experiments with different rainfall intensities, the effect of slope length on erosion-transport process of loess slope at 15 ° was studied. The results show that runoff increases with the increase of slope length. The runoff increases with the slope length at 50 and 75 mm / h rainfall intensities are basically the same. At the rainfall intensity of 100 mm / h, when the slope length is less than 5 m, the slope runoff increases little with the slope length. When the slope length is more than 5 m, the slope runoff increases obviously with slope length Increase. In the 8 m slope length, the erosion amount of the slope alternates with the fluctuation of the slope length. With the increase of the slope length, the erosion phenomenon of the slope presents the alternation mainly of the erosion-transport process and the erosion-deposition process .