1.四川省自然资源勘察设计集团有限公司,四川 成都 610051
2.成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059
李扬(1998—),男,助理工程师,硕士。主要从事地质灾害评价、预测及防治研究。E-mail:1311903626@qq.com
汤明高(1978—),男,教授,博导,博士。主要从事地质灾害机理、评价预测及防治研究。E-mail:tomyr2008@163.com
收稿:2023-09-25,
修回:2023-12-13,
纸质出版:2024-12-15
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李扬,汤明高,帅奕垚等.阿汝冰崩⁃碎屑流运动过程反演及预测模拟研究[J].防灾减灾工程学报,2024,44(06):1311-1322.
LI Yang,TANG Minggao,SHUAI Yiyao,et al.Inversion and Prediction Simulation Study of AruIce Avalanche⁃debris Flow Movement Process[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(06):1311-1322.
李扬,汤明高,帅奕垚等.阿汝冰崩⁃碎屑流运动过程反演及预测模拟研究[J].防灾减灾工程学报,2024,44(06):1311-1322. DOI: 10.13409/j.cnki.jdpme.20230925006.
LI Yang,TANG Minggao,SHUAI Yiyao,et al.Inversion and Prediction Simulation Study of AruIce Avalanche⁃debris Flow Movement Process[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(06):1311-1322. DOI: 10.13409/j.cnki.jdpme.20230925006.
冰崩作为冰冻圈最具灾难性的地质灾害之一,具有运动过程复杂、预测难度高、致灾后果严重等特点。2016年7月17日和9月21日在西藏阿里地区发生了两起巨型冰崩⁃碎屑流事件,对当地居民生命财产安全以及生态环境造成了严重危害,利用PFC
3D
反演了这两次冰崩⁃碎屑流运动过程,在此基础上对周边区域潜在冰崩隐患进行了预测模拟研究。结果表明:(1)两次冰崩⁃碎屑流运动时间分别为300 s和240 s,颗粒平均速度峰值分别为32.05 m/s和34.80 m/s,第一次冰崩入湖体积约为8.47×10
6
m
3
;(2)前后部分的能量传递是冰崩⁃碎屑流产生高速远程运动的关键机制;(3)预测阿汝85号冰川(冰崩隐患)发生冰崩后形成的西北侧主堆积区面积约为1.1 km
2
,东北侧小堆积区面积约为0.3 km
2
,危险区面积共计3.28 km
2
;该成果对于青藏高原的冰崩防灾减灾工作具有一定科学价值和现实意义。
As one of the most catastrophic geological disasters in the cryosphere
ice avalanche is characterized by complex movement process
high prediction difficulty
and severe consequences. On July 17 and September 21
2016
two massive ice avalanche-debris flow events occurred in Ali Prefecture
Tibet
causing significant harm to the life and property safety of local residents and the ecological environment. PFC
3D
was used to invert the movement processes of the two events
and based on this
potential ice avalanche hazards in the surrounding areas were simulated and predicted. The results showed that: (1) The movement durations of the two ice avalanche-debris flows were 300 s and 240 s
with peak average particle velocities of 32.05 m/s and 34.80 m/s
respectively. The volume of the first ice avalanche that entered the lake was approximately 8.47×10
6
m
3
. (2) Energy transfer between the front and rear was the key mechanism for the high-speed and long-range movement of ice avalanche-debris flow. (3) It was predicted that the main accumulation area on the northwest side formed after the ice avalanche at Aru No. 85 Glacier (ice ava
lanche hazard) was approximately 1.1 km
2
the small accumulation area on the northeast side was approximately 0.3 km
2
and the total danger area was 3.28 km
2
. The result has scientific value and practical significance for ice avalanche disaster prevention and mitigation on the Qinghai-Tibet Plateau.
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