DEVELOPMENT CHARACTERISTICS AND PREVENTION SUGGESTIONS OF THE LEPA DEBRIS FLOW IN THE ANNING RIVER FAULT ZONE

ZHANG Rui-duan; GUO Chang-bao; ZHANG Yong-shuang; FU Xiao-xiao

Volume 20 Issue 2

Jun. 2014

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Article Navigation > Journal of Geomechanics > 2014 > 20(2): 132-139

ZHANG Rui-duan, GUO Chang-bao, ZHANG Yong-shuang, et al., 2014. DEVELOPMENT CHARACTERISTICS AND PREVENTION SUGGESTIONS OF THE LEPA DEBRIS FLOW IN THE ANNING RIVER FAULT ZONE. Journal of Geomechanics, 20 (2): 132-139.

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DEVELOPMENT CHARACTERISTICS AND PREVENTION SUGGESTIONS OF THE LEPA DEBRIS FLOW IN THE ANNING RIVER FAULT ZONE

1.
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

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Abstract

Abstract

The paper gives careful calculations of the maximum debris flow in the Lepa gully in June 17^th, 2011, the extraordinarily serious debris flow calamities in the last fifty years. By calculation, the mean velocity of the debris flow was 2.03 m/s with a peak discharge of 200.11 m³/s. The unstable slopes in the front edge of the upper Lepa gully's river bank together with those gravels overlapped on its riverbed proved to be the main solid substance source of the Lepa debris flow. The diameter of the clastics' particle in the upper branch was small, so they are prone to be swept away by floods in the gully rather than resulting in the formation of barrier lakes or extraordinarily serious debris flow calamities. Currently, Lepa gully still has possibility of debris flow's breakout, suggestions lie in planting trees in the upper and middle reaches of the gully, cleaning riverbed in the lower reaches, setting up monitoring and warning system, to prevent the debris flow.
- Anning River fault zone,
- Lepa gully,
- debris flow,
- development

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