IMHE OpenIR  > 山地灾害与地表过程重点实验室
DEBRIS FLOWS RESULTING FROM GLACIAL-LAKE OUTBURST FLOODS IN TIBET, CHINA
Cui, Peng1,2; Dang, Chao3; Cheng, Zunlan1,2; Scott, Kevin M.
Corresponding AuthorCui, P(崔鹏)
2010
Source PublicationPHYSICAL GEOGRAPHY
ISSN0272-3646
EISSN1930-0557
Volume31Issue:6Pages:508-527
SubtypeArticle; Proceedings Paper
AbstractDuring the last 70 years of general climatic amelioration, 18 glacial-lake outburst floods (GLOFs) and related debris flows have occurred from 15 moraine-dammed lakes in Tibet, China. Catastrophic loss of life and property has occurred because of the following factors: the large volumes of water discharged, the steep gradients of the U-shaped channels, and the amount and texture of the downstream channel bed and bank material. The peak discharge of each GLOF exceeded 1000 m(3)/s. These flood discharges transformed to non-cohesive debris flows if the channels contained sufficient loose sediment for entrainment (bulking) and if their gradients were > 1%. We focus on this key element, transformation, and suggest that it be included in evaluating future GLOF-related risk, the probability of transformation to debris flow and hyperconcentrated flow. The general, sequential evolution of the flows can be described as from proximal GLOFs, to sediment-laden streamflow, to hyperconcentrated flow, to non-cohesive debris flow (viscous or cohesive debris flow only if sufficient fine sediment is present), and then, distally, back to hyperconcentrated flow and sediment-laden streamflow as sediment is progressively deposited. Most of the Tibet examples transformed only to non-cohesive debris flows. The important lesson for future hazard assessment and mitigation planning is that, as a GLOF entrains (bulks) enough sediment to become a debris flow, the flow volume must increase by at least three times (the "bulking factor"). In fact, the transforming flow waves overrun and mix with downstream streamflow, in addition to adding the entrained sediment (and thus enabling addition of yet more sediment and a bulking factor in excess of three times). To effectively reduce the risk of GLOF debris flows, reducing the level of a potentially dangerous lake with a siphon or excavated spillway or installing gabions in combination with a downstream debris dam are the primary approaches.
KeywordGlacial-lake Outburst Floods Debris Flow Flow Transformation Sediment Bulking Tibet
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.2747/0272-3646.31.6.508
WOS Subject ExtendedEnvironmental Sciences & Ecology ; Physical Geography ; Geology ; Meteorology & Atmospheric Sciences
Indexed BySCI
WOS KeywordMORAINE-DAMMED LAKES ; CATASTROPHIC DRAINAGE ; BRITISH-COLUMBIA
Language英语
Quartile4区
TOP
WOS SubjectEnvironmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS IDWOS:000285920400004
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/5570
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
3.China Three Gorges Univ, Key Lab Geol Hazards Gorges Reservoir Area 3, Minist Educ, Yichang 443002, Hubei, 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
Cui, Peng,Dang, Chao,Cheng, Zunlan,et al. DEBRIS FLOWS RESULTING FROM GLACIAL-LAKE OUTBURST FLOODS IN TIBET, CHINA[J]. PHYSICAL GEOGRAPHY,2010,31(6):508-527.
APA Cui, Peng,Dang, Chao,Cheng, Zunlan,&Scott, Kevin M..(2010).DEBRIS FLOWS RESULTING FROM GLACIAL-LAKE OUTBURST FLOODS IN TIBET, CHINA.PHYSICAL GEOGRAPHY,31(6),508-527.
MLA Cui, Peng,et al."DEBRIS FLOWS RESULTING FROM GLACIAL-LAKE OUTBURST FLOODS IN TIBET, CHINA".PHYSICAL GEOGRAPHY 31.6(2010):508-527.
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