Journal of Mountain Science

, Volume 14, Issue 7, pp 1373–1383 | Cite as

Soil detachment and transport under the combined action of rainfall and runoff energy on shallow overland flow

  • Guang-lu Li
  • Teng-hui Zheng
  • Yu Fu
  • Bai-qiao Li
  • Teng Zhang
Article

Abstract

Rainfall and runoff energy results in soil erosion. This paper presents new the concepts of rainfall and runoff energy and analyzes the relationship of rainfall energy and runoff energy with sediment transport based on the conversion theory of kinetic and potential energy using artificial rainfall and mechanical calculation. The results show that the ratio of sediment detachment in sloping fallow overland flow increases with the slope gradient, rainfall energy and runoff energy, while the sediment detachment ratio under raindrop impact are significantly higher than those under no raindrop impact. The sediment concentration increases with the slope gradient and rainfall energy; when the slope gradient and rainfall energy are constant, the sediment concentration decreases as the runoff energy increases. Rainfall disturbance coefficients have a logarithmic correlation with the rate of rainfall energy and runoff energy. On the same slope gradient, when the rainfall energy is constant, the disturbance coefficient decreases as the runoff energy increases, while when the runoff energy is constant, the disturbance coefficient increases as the rainfall energy increases. Rainfall energy results in sediment detachment, and runoff energy is the transportation for erosion sediment. This showed that rainfall energy and runoff energy are important in the sediment detachment and transportation of shallow overland flow.

Keywords

Shallow overland flow Rainfall energy Runoff energy Sediment detachment Disturbance coefficient 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Guang-lu Li
    • 1
    • 2
  • Teng-hui Zheng
    • 1
  • Yu Fu
    • 1
  • Bai-qiao Li
    • 1
  • Teng Zhang
    • 1
  1. 1.College of Resource and EnvironmentNorthwest A & F UniversityYanglingChina
  2. 2.Key laboratory for Agricultural Resources and Environmental Rehabilitation on the Loess Plateau of Agriculture Ministry of ChinaYanglingChina

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