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A preliminary study of the failure mechanisms of cascading landslide dams
Zhou, Gordon G. D.1,2; Cui, Peng1,2; Zhu, Xinghua1,2; Tang, Jinbo1,2; Chen, Huayong1,2; Sun, Qicheng3
Corresponding AuthorCui, Peng
AbstractLandslide dams commonly form when mass earth or rock movements reach a river channel and cause a complete or partial blockage of the channel. Intense rainfalls can induce upstream flows along a sloping channel that significantly affect downstream landslide dams. If a series of landslide dams are collapsed by incoming mountain torrents (induced by intense rainfall), large debris flows can form in a very short period. Furthermore, the failure of these dams can amplify the magnitude and scale of debris flows in the flow direction. The catastrophic debris flows that occurred in Zhouqu County, China on 8 August 2010 were caused by intense rainfall and the upstream cascading failure of landslide dams along the gullies. Incorporating the role of outburst floods associated with the complete or partial failure of landslide dams is an interesting problem usually beyond the scope of analysis because of the inherent modeling complexity. To understand the cascading failure modes of a series of landslide dams, and the dynamic effect these failures have on the enlargement of debris flow scales, experimental tests are conducted in sloping channels mimicking field conditions, with the modeled landslide dams distributed along a sloping channel and crushed by different upstream flows. The failure modes of three different cascades of landslide dams fully or partially blocking a channel river are parametrically studied. This study illustrates that upstream flows can induce a cascading failure of the landslide dams along a channel. Overtopping is the primary failure mechanism, while piping and erosion can also induce failures for different constructed landslide dams. A cascading failure of landslide dams causes a gradually increasing flow velocity and discharge of the front flow, resulting in an increase in both diameter and percentage of the entrained coarse particles. Furthermore, large landslide blockages can act to enhance the efficiency of river incision, or conversely to induce aggradation of fluvial sediments, depending on the blockage factor of the landslide dams and upstream discharge. (C) 2015 Published by Elsevier B.V. on behalf of International Research and Training Centre on Erosion and Sedimentation/the World Association for Sedimentation and Erosion Research.
KeywordCascading Failure Landslide Dam Upstream Flow Failure Mode Landscape Evolution Debris Flow
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Water Resources
Indexed BySCI
WOS SubjectEnvironmental Sciences ; Water Resources
WOS IDWOS:000363338600004
Funding OrganizationKey Research Program of the Chinese Academy of Sciences(KZZD-EW-05-01) ; National Natural Science Foundation of China (NSFC)(41201012 ; Hundred Young Talents Program of the Institute of Mountain Hazards and Environment(SDSQB-2013-01) ; 41371038)
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Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu, Peoples R China
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
3.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhou, Gordon G. D.,Cui, Peng,Zhu, Xinghua,et al. A preliminary study of the failure mechanisms of cascading landslide dams[J]. INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,2015,30(3):223-234.
APA Zhou, Gordon G. D.,Cui, Peng,Zhu, Xinghua,Tang, Jinbo,Chen, Huayong,&Sun, Qicheng.(2015).A preliminary study of the failure mechanisms of cascading landslide dams.INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH,30(3),223-234.
MLA Zhou, Gordon G. D.,et al."A preliminary study of the failure mechanisms of cascading landslide dams".INTERNATIONAL JOURNAL OF SEDIMENT RESEARCH 30.3(2015):223-234.
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