Study on mechanism of regulation measures on water erosion process in the slope system

Water erosion is one of the important contents in basin soil erosion. Its process and development is the core of soil erosion dynamic mechanics, and also is the key for the prevention of soil and water loss and development of physical model for soil erosion prediction. Based upon indoor simulated rainfall experiment, the effect of vegetation regulating on slope water erosion was studied systematically. The results show that rainfall intensity is the main factor affecting runoff, its contribution ratio of runoff is 87%, and slope gradient is the main factor affecting sediment, its contribution ratio of sediment is 76%, which is more obvious in strong rainfall or on steep slope. Vegetation coverage has more influence on runoff and sediment yield than slope gradient. Vegetation distributed in the lower slope conserves soil better than that in the upper and middle slopes under the same vegetation coverage condition. With increase of the vegetation coverage, the runoff volume and runoff erosion power decrease within the power function distribution range, the total sediment yield decrease within the exponential function distribution range, and the effectiveness of vegetation regulating on runoff and sediment yield is strengthen gradually.