Characteristics, causes, and risk reduction of a catastrophic debris flow hazard on 05 July 2021 at the Xiangjiao Gully of Muli County, China | |
Yang, Huaquan1,2,3; Liu, Jinfeng2,3; Sun, Hao2,3; Zhao, Wanyu1,2,3; Wang, Dongwei1,2,3; Zhang, Wentao1,2,3 | |
刊名 | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT |
2022-12-01 | |
卷号 | 81期号:12页码:15 |
关键词 | Debris flow Disaster characteristics Rainfall analysis Forest fires Rectangle V-shaped drainage canal Cross-section optimization |
ISSN号 | 1435-9529 |
DOI | 10.1007/s10064-022-03014-1 |
英文摘要 | The destruction of mountain landform by forest fire often leads to the outbreak of catastrophic debris flow. In March 2020, a huge forest fire broke out in Xiangjiao Gully, seriously damaging the mountain landform and leading to the outbreak of a catastrophic debris flow on July 5th, 2021. To mitigate such disasters more scientifically, this paper analyzes the disaster characteristics of the "7.05" catastrophic debris flow and studies the cause mechanism and mitigation countermeasures. The results show that the debris flow density ranges from 1.831 g/cm(3) to 1.930 g/cm(3), belonging to viscous debris flow. The velocity of each section point is between 7.22 and 9.78 m/s, with huge kinetic energy. Forest fire, torrential rainfall, and gully terrain conditions combined to cause the outbreak of the debris flow. The rainfall intensity of the maximum rainfall point reached 77.84 mm, corresponding to a recurrence period of more than 200 years. The forest fire severely damaged the landform, and the high-intensity burned area reached 59.97%, which led to a surge in loose materials and wood debris. Combined with steep terrain, channel erosion and the blocking-bursting effect are prominent, leading to the scale amplification of debris flow. The peak flow of the upstream section D-1 and the downstream section D-6 are 308.21 m(3)/s and 759.08 m(3)/s, with the scale expanded by 2.46 times. To mitigate the harm of Xiangjiao Gully debris flow, this paper deduced the determination method of the optimal hydraulic section of a Rectangle-V-shaped drainage canal under the limited conditions. The calculated characteristic parameter of the section is m=11.75, h(2) = 0.60 m. |
资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23090403] ; Second Tibetan Plateau Scientific Expedition and Research (STEP) Program[2019QZKK0902] |
WOS关键词 | EARTHQUAKE ; INITIATION ; CHANNEL |
WOS研究方向 | Engineering ; Geology |
语种 | 英语 |
出版者 | SPRINGER HEIDELBERG |
WOS记录号 | WOS:000889066400001 |
资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences ; Second Tibetan Plateau Scientific Expedition and Research (STEP) Program |
内容类型 | 期刊论文 |
源URL | [http://ir.imde.ac.cn/handle/131551/57004] |
专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
通讯作者 | Liu, Jinfeng |
作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China 3.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China |
推荐引用方式 GB/T 7714 | Yang, Huaquan,Liu, Jinfeng,Sun, Hao,et al. Characteristics, causes, and risk reduction of a catastrophic debris flow hazard on 05 July 2021 at the Xiangjiao Gully of Muli County, China[J]. BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,2022,81(12):15. |
APA | Yang, Huaquan,Liu, Jinfeng,Sun, Hao,Zhao, Wanyu,Wang, Dongwei,&Zhang, Wentao.(2022).Characteristics, causes, and risk reduction of a catastrophic debris flow hazard on 05 July 2021 at the Xiangjiao Gully of Muli County, China.BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT,81(12),15. |
MLA | Yang, Huaquan,et al."Characteristics, causes, and risk reduction of a catastrophic debris flow hazard on 05 July 2021 at the Xiangjiao Gully of Muli County, China".BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 81.12(2022):15. |
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