细沟作为坡面水土流失红线监测标志可行性探讨

Feasibility studies on using rill as monitoring sign of redlines for soil and water loss on slope surface

水土流失红线为计入水土流失面积的土壤流失量控制线,容许土壤流失量是水土流失红线特征值,但缺乏水土流失红线监测的指示标志。解决水土流失监测对象问题是水土流失红线研究的首要任务。细沟是水力侵蚀作用下在坡面上产生的一种小沟槽地形,细沟形成是坡面水土流失由轻微转向强烈的最明显标志。根据细沟形态特征、侵蚀特点和发育条件,论证了细沟作为坡面水土流失红线监测标志的可行性,即细沟不仅具备坡面水土流失监测对象的条件,还可作为坡面容许土壤流失量判别的标志,而且可作为坡面水土流失治理效果评估的重要指标,更是坡面水系工程布局的依据。

Redlines of soil and water loss refer to control lines of soil loss calculated in eroded areas. Allowable soil loss refers to characteristic value of soil erosion redlines. However, there is no indication sign for monitoring of soil erosion redlines. The first task of studying soil erosion redlines is to find out the objects of monitoring.Being one of the rill landscapes under the function of hydraulic erosion, the formation of rill may be applied as the clearest sign of slope erosion ranging from slight to intensive. According to its morphological characteristics,erosion feature and development condition, the possibility of using rill as monitoring sign is examined. It is demonstrated that rill can be a monitoring object and sign for judging allowable soil loss of slope and also key indicator for assessment of erosion control and basis for design of slope water system.