LIU He-ping, WANG Xiu-ying, LIU Bao-yuan. Relationship between Soil Erosion and Slope Length on Short Slopes[J]. 2011, 25(2).DOI:
短坡条件下侵蚀产沙与坡长的关系
摘要
采用变雨强人工模拟降雨
选择1~10 m共7个坡长
在5°条件下研究了侵蚀产沙量及其过程与坡长的关系
每个坡长进行干运行和湿运行降雨。结果表明:(1)干运行降雨40~80 min
虽然雨强逐渐减小
但4 m及以上坡长小区的径流含沙量保持较高的水平并出现跳跃
而1 m和2.5 m的小区的径流含沙量在整个降雨过程中较平滑;湿运行含沙量总体上小于干运行
且波动幅度较干运行小。(2)2 h降雨平均含沙量随着坡长的增加而增加
可用二次多项式、幂函数及直线来拟合。(3)侵蚀模数与坡长呈幂函数关系
细沟间和细沟侵蚀模数的坡长指数分别为0.101~0.240和0.757~1.609
表明随着坡长增加
细沟间侵蚀增加较小
而细沟侵蚀增加迅速;干运行的坡长指数均大于湿运行的波长指数。
Abstract
Simulated rainfall of varied intensity was applied on plots of 1~10 m in length and 5 degrees in steepness to investigate the effects of slope length on soil erosion processes and soil loss.For each slope length
a wet run was implemented 24 hours after the dry run.The results indicated that sediment concentration on plots equal or longer than 4 m fluctuated during 40~80 min when the rainfall intensity decreased
while it was much smoother on plots of 1 m and 2.5 m.For wet run