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采用室内人工模拟降雨试验,降雨用水为纯净水,试验坡度为10°、15°、20°、25°,降雨强度为1.5和2.0 mm/min,试验土槽分别为5和10 m,同时采用三维激光扫描仪对降雨前后坡面进行监测,分析不同坡度对细沟侵蚀的影响。结果表明:1)坡度对坡面产沙量影响显著,二者的关系可以采用二次项式拟合,坡面产沙量随着坡度的变陡先增加后减少;2)三维激光扫描技术能够准确地计算坡面细沟发育形态数据和细沟侵蚀量,不同坡度条件下细沟发育不同,细沟宽深比随着坡度的变陡而逐渐变小;3)细沟密度、细沟侵蚀量与坡度呈正相关关系,细沟发育程度随坡度的变陡而加剧。
Indoor artificial simulated rainfall test, rainfall water is pure water, the test slope is 10 °, 15 °, 20 °, 25 °, the rainfall intensity of 1.5 and 2.0 mm / min, soil test tank were 5 and 10 m, The three-dimensional laser scanner monitors the slope before and after raining, and analyzes the influence of different slopes on the erosion of rill. The results show that: 1) the slope has a significant effect on the sediment yield, and the relationship between the two can be fitted by quadratic formula. The sediment yield increases with the steep gradient and then decreases. 2) Three-dimensional laser scanning technology The data of rill development and rill erosion can be accurately calculated. The development of rill is different under different slope conditions, and the width-to-depth ratio of rill becomes smaller gradually with the steep slope. 3) The density of rill, The amount of erosion is positively correlated with the slope, and the development of the rill is aggravated with the steep slope.