Title: Experimental Study on Law of Runoff-Erosion-Sediment Yield under Indoor Simulated Rainfall Condition
Abstract: Rainfall and runoff are the main dynamic factors which cause soil erosion on the Loess Plateau.Research on processes of rainfall,runoff and sediment yield can promote the development of soil erosion process-based model,and provide important scientific basis for soil and water conservation,and ecology construction on loess region.The rules of rainfall and runoff erosion,sediment yield,infiltration and the correlation among each other were studied under different vegetation patterns by using indoor simulated rainfall experiments.The results showed that rainfall intensity was the main factor affecting runoff generation,with a contribution ratio of runoff generation of 87%,while slope gradient was the main factor affecting sediment yield,with a contribution ratio of sediment yield of 76%,which were more obvious in strong rainfall or on steep slope.Under simulated rainfall condition,the moisture content on slope was in the following order: middle-lower slopemiddle slopeupper slope.Vegetation coverage had more influence on runoff and sediment yield than slope gradient.Vegetation distributed in the lower slope conserved soil better than that in the upper and middle slopes under the same vegetation coverage condition.With the increase of vegetation coverage,runoff volume decreased within the power function distribution range,the total sediment yield and sediment concentration decrease within the exponential function distribution range,and the effectiveness of vegetation regulating on runoff and sediment yield were strengthened gradually.The results were significantly meaningful for understanding the rainfall and runoff erosion and sedimented yield process in watershed,and could provide reliable experimental support for related researches on soil erosion model.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 3
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