Relationship between sediment transport with surface rainfall and runoff energies on sloping

LI Guang-lu; WU Fa-qi; PANG Xiao-ming; ZHAO Xiao-feng

Volume 19 Issue 6

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Advances in Water Science > 2008 > 19(6): 868-874.

LI Guang-lu, WU Fa-qi, PANG Xiao-ming, ZHAO Xiao-feng. Relationship between sediment transport with surface rainfall and runoff energies on sloping[J]. Advances in Water Science, 2008, 19(6): 868-874.

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Relationship between sediment transport with surface rainfall and runoff energies on sloping

1.
College of Resource and Environment, Northwest A&F University, Yangling 712100, China;
2.
Tianshui Soil and Water Conservation Experiment Station of YRCC, Tianshui 741000, China

Funds: The study is financially supported by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (No.14110105)

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Received Date: December 24, 2007

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From the view of rainfall and runoff energies resulting in soil erosion,this paper puts forward the conceptions of rainfall energy and runoff energy on the base of physics principle,and analyses the relationship between sediment transport with rainfall energy and runoff energy using the artificial rainfall.The results show that the rate of sediment detachment of sloping fallow overland flow increases with the rise of the slope gradient,rainfall energy and runoff energy,and the sediment detachment rates under raindrop impact are severe higher than under those without raindrop impact.The sediment concentration increases with the increase of the slope gradients and rainfall energies;when slope gradients and rainfall energy keep a constant,the sediment concentrations decrease with the increase of the runoff energies.Rainfall disturbed coefficients have a logarithm correlation with the rate of rainfall energy and runoff energy.On same slope gradient,when the rainfall energies keep a constant,the disturbed coefficient decreases as the runoff energies increases,when the runoff energies keep a constant,it increases as the rainfall energy increases.The rainfall energy is the essence to result in sediment detachment,and the runoff energy is the conveyer for erosion sediment.
- fallow overland flow,
- rainfall energy,
- runoff energy,
- sediment detachment,
- sediment concentration,
- disturbed coefficient by raindrop

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