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| Distribution of shear stress and the relationship between soil detachment rate and shear stress under experiments |
| Yang Chunxia,Yao Wenyi,Xiao Peiqing,Wang Lingling,Shen Zhenzhou |
| Yellow River Institute of Hydraulic Research,YRCC,Key Laboratory of Yellow River Sediment Research,MWR,450003,Zhengzhou,China |
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Abstract Shear stress is an important hydrodynamic parameter in the establishment of soil erosion prediction model,so it has very important theoretical and practical significance to study the relationship between shear stress and erosion;Using simulated runoff-scouring experiments,the shear stress characteristics under different erosion process and different conditions were studied,and the correlations between shear stress and soil detachment rate were analyzed.The result shows that shear stress under different erosion process and soil detachment rate increase indirect proportion with the flow,but with the change of slope affected by the critical slope under different experiment conditions;Soil detachment rate is linear correlation with the flow,the slope and the shear stress,the relationship between which shows that the soil detachment rate increases indirect proportion with the flow and slope,and inversely proportional to shear stress;soil detachment rate was power-function or exponential-relationship associated with shear stress under different erosion process;shear stress when the pit appeared and the average of the runoff process can be used as soil erosion prediction.
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Received: 03 June 2010
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