不同因素对重庆紫色土坡面细沟侵蚀产沙过程的影响研究

Study on influencing factors of rill erosion and sediment yield process on purple soil slope

为揭示重庆紫色土坡面细沟形态、降雨强度和坡度对侵蚀产沙过程的影响,通过室内模拟人工降雨试验,定量分析不同降雨强度、不同坡度、细沟形态变化和不同降雨方式对细沟侵蚀产沙过程的影响,探讨细沟侵蚀强度在不同试验条件下的变化特征。结果表明:重庆紫色土坡面细沟侵蚀径流量和产沙量均随着坡度和降雨强度的增加而增加;坡面的水沙过程与细沟在形成和发育时关系密切,产沙量和侵蚀速率与细沟形态参数有显著的对数关系(r>0.7)。研究结果可以为紫色土耕地细沟侵蚀防治提供理论支持。

In order to reveal the influence of rill morphology,rainfall intensity and slope on the process of erosion and sediment yield,the influence of different rainfall intensity,slope and rainfall mode on the process of rill erosion and sediment yield was quantitatively analyzed by indoor experiment of simulated rainfall,and the indexes such as average rill length,average rill depth and average rill width were selected to reflect the change rule of rill morphology with rainfall duration.The results show that rill erosion runoff and sediment yield increase with the growth of slope and rainfall intensity.There is a close relation between the water and sediment process on slope and the formation and development of silver sand.There is a significant logarithmic relationship between sediment yield and erosion rate and rill morphology parameters.This study can provide theoretical and technical support for rill erosion control of purple soil in arable land.