KONG Ya ping 1. Impacts of Slope Length on Soil Erosion Process under Simulated Rainfall[J]. 2001, 15(2): 17-20.DOI：
坡长对侵蚀产沙过程影响的模拟研究
摘要
通过室内模拟降雨试验探讨了坡长对侵蚀产沙过程的影响规律。实验结果表明
坡长是影响径流、侵蚀产沙的重要因素
径流量与坡长呈线性关系
侵蚀量与坡长基本呈指数关系。累积径流量与累积侵蚀产沙量均与降雨历时呈明显的直线关系
其斜率随坡长的增加而增大。坡长对侵蚀形态的演化也有重要作用
在试验条件下
0 .72 mm/ min雨强下 2 .5
5
7.5
10 m坡长小区均未发生细沟侵蚀 ;雨强增至 1.14mm / min时
10 m小区发生了细沟侵蚀 ;雨强大于 1.14mm / min时
7.5 m以上的小区均有细沟侵蚀发生。细沟发育时
坡面径流、侵蚀产沙量猛增
水流含沙量也出现了跳跃性增加
Abstract
The rules of soil erosion processes influenced by slope length were studied using the simulated artificial rainfall experiments. The results show that slope length is an important factor that influences runoff and soil erosion. There is significant linear relationship between runoff and slope length
and there is a exponential relationship between soil erosion and slope length. The accumulation of both runoff amount and soil erosion increases linearly with rainfall duration and the increment increases with rainfall intensity. The slope length is also important for the evolvement of erosion configuration. Under the experimental condition
when the rainfall intensity is 0.72 mm/min
rill erosion cannot occur on 2.5m long plot
5m long plot
7.5m long plot and 10m long plot; when the rainfall intensity is increased to 1.14mm/min
rill erosion occurs on the 10m long plot; when the rainfall intensity exceed 1.14mm/min
rill erosion occurs on the plot longer than 7.5m. Once the rill develops
the runoff
soil erosion and sediment concentration will increase rapidly.
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