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Geohazard cascade and mechanism of large debris flows in Tianmo gully SE Tibetan Plateau and implications to hazard monitoring
Wei Rongqiang1,2; Zeng Qingli1,2; Davies Tim3; Yuan Guangxiang4; Wang Kaiyang2,5; Xue Xinyu2; Yin Qianfeng2
2018
Source PublicationEngineering Geology
ISSN0013-7952
Volume233Pages:172-182
SubtypeArticle
Contribution Rank1
AbstractAlpine glaciers and permafrost are sensitive to climate change and their degradation due to annual temperature increasing has already induced many mass movements such as debris flows. On September 4 of 2007 July 25–31 and September 5–8 of 2010 three large debris flows took place in Tianmo gully a left-bank tributary of Parlung River southeast Tibetan Plateau. The debris flows blocked the river and a section of highway 450 m long including a bridge 76 m long were destroyed by the subsequent outburst flood. This paper based on post-event investigations witness accounts news reports and satellite image interpretation systematically analyses the geo-environments climate conditions and sources of these debris flow events. Their differences in flow process surge numbers and velocity suggest that they resulted from different geohazard processes cascades and initiation mechanisms. The 2007 debris flow originated from a bare rock/moraine collapse next to the cirque due to strong alternation of wet and dry conditions. The mass moved down the gully with velocity of 30–40 m/s estimated by back-calculation using superelevation and run-up. It entrained moraine avalanched snow-ice and water from the channel and transformed into high-speed debris flow crossing the Parlung River and finally depositing onto the highway. The other two events in July and September of 2010 initiated from two channel-bank landslides triggered by melt-water and concentrated rainfall which dammed the channel. The subsequent landslide dam failure generated debris flows over several days with velocities of 12–14 m/s that temporally blocked Parlung River. The initiation mechanisms of most large debris flows recorded in Parlung region are similar to the events in Tianmo gully originating either from rock/moraine avalanches or from the collapse of a landslide dam. This implies that the periglacial degradation of bedrock and moraine is the key process to be monitored and assessed under climate warming. The paper applies the geohazard mechanisms and cascade to hazard monitoring in order to protect the existing Sichuan-Tibet highway and the forthcoming railway. © 2017 Elsevier B.V.
KeywordRock avalanche Landslide dam-breach Geohazard cascade Deglaciation Sichuan-Tibet highway/railway
DOI10.1016/j.enggeo.2017.12.013
Indexed ByEI
Language英语
EI Accession NumberAccession number:20180404675909
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/25585
Collection山地灾害与地表过程重点实验室
Corresponding AuthorZeng Qingli
Affiliation1.Key Laboratory of Computational Geodynamics Chinese Academy of Sciences Beijing ;100049 China ;
2.University of Chinese Academy of Sciences Beijing ;100049 China ;
3.Department of Geological Sciences University of Canterbury Christchurch ;8041 New Zealand ;
4.College of Resources and Environment North China University of Water Resources and Electric Power Zhengzhou ;450045 China ;
5.Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ;100029 China
Recommended Citation
GB/T 7714
Wei Rongqiang,Zeng Qingli,Davies Tim,et al. Geohazard cascade and mechanism of large debris flows in Tianmo gully SE Tibetan Plateau and implications to hazard monitoring[J]. Engineering Geology,2018,233:172-182.
APA Wei Rongqiang.,Zeng Qingli.,Davies Tim.,Yuan Guangxiang.,Wang Kaiyang.,...&Yin Qianfeng.(2018).Geohazard cascade and mechanism of large debris flows in Tianmo gully SE Tibetan Plateau and implications to hazard monitoring.Engineering Geology,233,172-182.
MLA Wei Rongqiang,et al."Geohazard cascade and mechanism of large debris flows in Tianmo gully SE Tibetan Plateau and implications to hazard monitoring".Engineering Geology 233(2018):172-182.
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