川西山区低频泥石流形成条件分析——以九寨沟县香扎沟泥石流为例

doi:10.13686/j.cnki.dzyzy.2023.03.013

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摘要近年来川西山区屡次暴发低频泥石流灾害，造成大量生命财产损失，危害性较大.通过对九寨沟县香扎沟泥石流进行深入调查、访问，分析了沟域地形地貌特征以及泥石流物质组成和暴发特征，揭示了泥石流的物质大多源于沟床启动，且与早年林木采伐、木材腐朽密切相关.另外，集中强降雨及陡峻的地形也是泥石流形成的有利条件.通过对比中、高频泥石流，提出低频泥石流具有隐蔽性、突发性、危害大的特点.川西山区有过采伐史且具备相应地形条件的沟域，应作为低频泥石流灾害的重点调查研究和防治对象.

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关键词 ：低频泥石流, 地质灾害, 林木腐朽, 降雨, 九寨沟, 四川省

Abstract：In recent years, low-frequency debris flow disasters often occurred in western Sichuan mountainous area, causing massive loss of life and property with great harm. Through the in-depth investigation and visit to Xiangzhagou debris in Jiuzhaigou County, the authors analyze the topographic and geomorphic features of gully area, as well as material compositions and outbreak characteristics of debris flow. It is concluded that the materials of debris flow are mostly initiated from gully bed and closely related to forest cutting and wood decay in early years. Besides, concentrated heavy rainfall and steep terrain also contribute to the formation of debris flow. Comparing with the medium- and high-frequency debris flows, the low-frequency debris flow has the characteristics of being hidden, sudden and dangerous. The gully areas with a logging history and corresponding topographic conditions in western Sichuan mountainous area should be the focus of investigation and prevention of low-frequency debris flow disasters.

Key words： low-frequency debris flow geological disaster wood decay rainfall Jiuzhaigou Valley Sichuan Province

收稿日期: 2022-03-29

PACS:

P642.2

基金资助:四川省九寨沟国家级自然保护区管理局项目"九寨沟景区89处地质灾害隐患点治理工程"（PF20180201012）.

作者简介: 王毅(1985-),男,硕士,高级工程师,主要从事岩土工程、地质灾害防治工程勘察设计工作,通信地址四川省成都市成华区华冠路35号,E-mail//wwyywangyi@163.com

引用本文:

王毅, 智晶子, 卢鹏飞. 川西山区低频泥石流形成条件分析——以九寨沟县香扎沟泥石流为例[J]. 地质与资源, 2023, 32(3): 360-365,344.
WANG Yi, ZHI Jing-zi, LU Peng-fei. FORMATION CONDITIONS OF LOW FREQUENCY DEBRIS FLOW IN WESTERN SICHUAN MOUNTAINOUS AREA: A Case Study of Xiangzhagou Debris Flow in Jiuzhaigou County. GEOLOGY AND RESOURCES, 2023, 32(3): 360-365,344.

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http://manu25.magtech.com.cn/Jweb_dzyzy/CN/10.13686/j.cnki.dzyzy.2023.03.013 或 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/Y2023/V32/I3/360

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