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impact failure models and application condition of trees in debris-flow hazard mitigation

Journal of Mountain Science 2021年第7期18卷 1874-1885页

作者： JIN Ke CHEN Jian-gang CHEN Xiao-qing ZHAO Wan-yu SI Guang-wu GONG Xing-long Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan University of Chinese Academy Sciences Beijing 100049China

Forestry has played an important role in hazard mitigation associated with debris *** forest mitigation measures refer to the experience of soil and water conservation,which disregard the destructive effect of debris flows,causing potentially serious *** of the effect of a forest on reducing debris-flow velocity and even stopping debris flows requires distinguishing between when the debris flow will destroy the forest and when the trees will withstand the debris-flow impact *** this paper,we summarized two impact failure models of a single tree: stem breakage and *** influences of different tree sizes characteristics(stem base diameter,tree weight,and root failure radius) and debris-flow characteristics(density,velocity,flow depth,and boulder diameter) on tree failure were *** observations obtained from the model adopted in this study show that trees are more prone to stem breakage than *** an increase in tree size,the ability to resist stem breakage and overturning ***-flow density influences the critical failure conditions of trees substantially less than the debrisflow velocity,depth,and boulder *** application conditions of forests in debris-flow hazard mitigation were proposed based on the analysis of the model *** proposed models were applied in the Xiajijiehaizi Gully as a case study,and the results explain the destruction of trees in the forest dispersing *** work provides references for implementing forest measures for debris-flow hazard mitigation.

关键词： Trees impact failure model Forest application condition Debris flow mitigation

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