论文部分内容阅读
细沟侵蚀规律的解译对于坡面治理具有重要的理论与实践意义.通过10m坡长条件下10°和25°坡面人工模拟降雨试验与高清摄像技术,研究了细沟侵蚀的时空动态变化特征.结果表明10°坡面单位坡长总侵蚀量和细沟侵蚀量均随距坡顶距离的增加先增大后减小,而25°坡面却呈现不断增加的趋势,但其增加速率逐渐减小.10°坡面平均含沙量随降雨历时先减少后增加,而25°坡面却先增加后减少.高清摄像技术可表征降雨过程中细沟平面形态变化,25°坡面平均细沟宽度始终小于10°坡面,但二者均随降雨历时先减小后增加,细沟侵蚀方式由以溯源侵蚀为主过渡到沟壁崩塌为主.
The interpretation of rill erosion law has important theoretical and practical significance for slope management.Through the simulated rainfall test and the high-definition camera technology on the 10 ° and 25 ° slope conditions, the spatial and temporal dynamics of rill erosion The results show that the total erosion of slope length and the erosion rate of rill at 10 ° slope first increase and then decrease with the increase of the distance from the top of the slope, while the slope of 25 ° slope shows an increasing trend, but the increasing rate Gradually decreased.The mean sediment concentration at 10 ° slope decreased first and then increased with the increase of rainfall duration, while the slope at 25 ° first increased and then decreased.High-definition camera technology can characterize the variation of the shape of the rill in the rainfall process, The width of the rill is always less than 10 °, but both of them decrease first and then increase with the rainfall duration. The rill erosion mainly changes from tracing erosion to ditch collapse.