Mechanism of Vegetation Regulating on Gravitational Erosion in the Slope-gully System on Loess Plateau

YU Guo-qiang, ZHANG Xia, ZHANG Mao-sheng, PEI Liang

JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. 27 ›› Issue (6) : 922-932.

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JOURNAL OF NATURAL RESOURCES ›› 2012, Vol. 27 ›› Issue (6) : 922-932. DOI: 10.11849/zrzyxb.2012.06.004

Mechanism of Vegetation Regulating on Gravitational Erosion in the Slope-gully System on Loess Plateau

  • YU Guo-qiang1, ZHANG Xia2, ZHANG Mao-sheng1, PEI Liang3
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Abstract

Mechanism of gravitational erosion in the slope-gully system and the root reinforcement reduction mechanism of the Loess Plateau was explored with the aid of the finite difference software, Flac3D, while numerical simulation of stress field and displacement field and plastic yielded zone with and without vegetation, and the reduction mechanism of root reinforcement was clarified. Results show that the displacement in the upper part of the slope-gully system appears mainly in the form of "settlement", and the displacement in the lower part appears mainly in the form of "shear", gully head traceability areas are most susceptible to gravitational erosion. The shear plastic zone is mainly distributed in most area of slope and gully slope, and the tension plastic zone is mainly distributed in tops and slopes of barren hills. As vegetation roots system reinforcement, the soil body stress of slope surface was improved, the extent of stress concentration and surface displacement were reduced effectively. The horizontal displacement and vertical displacement were reduced by 15% and 2.5% respectively. The volume of plastic yielded zone was also reduced, the volume of shear plastic zone and tension plastic zone were reduced by 11.48% and 83.99% respectively. The degree of damage of gravitational erosion was mitigated. However, the main failure model in the slope-gully system is still shear failure model. This study will provide a new method for understanding of vegetation root regulation on gravitational erosion.

Key words

slope-gully system / gravitational erosion / regulating mechanism / vegetation root

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YU Guo-qiang, ZHANG Xia, ZHANG Mao-sheng, PEI Liang. Mechanism of Vegetation Regulating on Gravitational Erosion in the Slope-gully System on Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2012, 27(6): 922-932 https://doi.org/10.11849/zrzyxb.2012.06.004

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