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| Simulated-rainfall experimental research on soil erosion processes on downslope segment of loess hillslope |
| Tan Zhenxue1,Wang Zhanli1,2,Ma Chunyan2,Liu Jun'e2,Yuan Yin2 |
| 1.State Key Lab.of Soil Erosion and Dryland Farming on Loess Plateau,Chinese Academy of Sciences and Ministry of Water Resources;2.State Key Lab.of Soil Erosion and Dryland Farming on Loess Plateau,Northwest A & F University: 712100,Yangling,Shaanxi,China |
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Abstract In the process of water erosion,runoff and sediment yield vary with the different segments of a hillslope.Clarifying the mechanism of erosion processes can provide a scientific basis for soil and water conservation measures.In this study,erosion processes on downslope were investigated using two flumes with different lengths under simulated rainfall.Results showed that 1) downslope erosion intensity varied with rainfall process,rainfall intensity,and slope gradient,characterized by up-down fluctuations.2) Erosion intensity varying with rainfall process,slope,and rainfall intensity between different segments on the same slope was obviously different.3) Runoff from both of the upslope and the downslope and sediment on the upslope had impacts on erosion intensity on the downslope and the impacts could be well described with a linear equation,with the former contribution being 47.8 % and the latter,20.4%.It can be concluded that only observation and analysis of average erosion characteristics cover up the detailed erosion processes.Taking soil and water conservation measures to reduce flow concentration from upslope and increase rainfall infiltration can effectively control soil erosion on downslope.
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Received: 24 April 2008
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