西藏聂拉木县嘉龙湖冰湖溃决型泥石流危险性评价

柴波; 陶阳阳; 杜娟; 黄平; 王伟

doi:10.3799/dqkx.2020.294

Volume 45 Issue 12

Dec. 2020

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Article Navigation > Earth Science > 2020 > 45(12): 4630-4639

Chai Bo, Tao Yangyang, Du Juan, Huang Ping, Wang Wei, 2020. Hazard Assessment of Debris Flow Triggered by Outburst of Jialong Glacial Lake in Nyalam County, Tibet. Earth Science, 45(12): 4630-4639. doi: 10.3799/dqkx.2020.294

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Chai Bo, Tao Yangyang, Du Juan, Huang Ping, Wang Wei, 2020. Hazard Assessment of Debris Flow Triggered by Outburst of Jialong Glacial Lake in Nyalam County, Tibet. Earth Science, 45(12): 4630-4639. doi: 10.3799/dqkx.2020.294

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Hazard Assessment of Debris Flow Triggered by Outburst of Jialong Glacial Lake in Nyalam County, Tibet

doi: 10.3799/dqkx.2020.294

Chai Bo^{1
,
,},
Tao Yangyang^{1, 3},
Du Juan²,
Huang Ping¹,
Wang Wei¹

1.
School of Environmental Studies, China University of Geosciences, Wuhan 430078, China
2.
Three Gorges Research Center for Geohazards, Ministry of Education, China University of Geosciences, Wuhan 430074, China
3.
Zhejiang Institute of Geology and Mineral Resources, Hangzhou 310007, China

Received Date: 2020-09-16
Publish Date: 2020-12-15

Abstract

Abstract

The debris flow caused by the outburst of glacial lake is a specific geohazard in the plateau mountainous area. With the study case of Jialong Lake, Nyalam County, Tibet, the hazard assessment model of the debris flow triggered by the outburst of glacial lake was established. Based on the analysis of temperature fluctuation from 1970 to 2015 in the Himalayas area and the historical events of glacial lake outburst in Nyalam County, the temporal probability of the outburst of Jialong Lake in the future 10 years is predicted. The range and magnitude of the unstable ice bodies above Jialong Lake are recognized relying on remote sensing images. The impulse waves generated by glacier landslide are determined with the formula recommended by American Society of Civil Engineers and the modified model of impulse waves in the Three Gorges Reservoir. The pressure of impulse waves and the thrust force of water current acting on the morainal dam are analyzed to assess the failure probability of morainal dam. FlO-2D was used to simulate the movement process of debris flow. The intensity of debris flow triggered by outburst of Jialong Lake were indicated with the maximum velocity and maximum depth of debris flow. The assessment results show that the outburst of Jialong Lake in 2002 was related to the high temperature in that year, and Jialong Lake still has a high probability of outburst in the future; the impulse waves caused by glacial landslide could climb over the top of the morainal dam, which cause rapid erosion and failure of the dam. The debris flow caused by the outburst of Jialong Lake would impact 54 buildings located along the river in Nyalam County. The model proposed in the paper realizes the quantitative hazard assessment of the debris flow caused by glacial lake outburst. The assessment results are of great significance for the risk management of debris flow in Nyalam County.
- glacial lake,
- debris flow,
- hazard assessment,
- glacial landslide,
- environmental geology

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References(50)

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Hazard Assessment of Debris Flow Triggered by Outburst of Jialong Glacial Lake in Nyalam County, Tibet

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