IMHE OpenIR  > 山地灾害与地表过程重点实验室
Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles
Wang, Hao1,2,3,4; Cui, Peng1,3; Liu, Dingzhu3,4; Liu, Weiming3; Bazai, Nazir Ahmed3,4; Wang, Jiao3; Zhang, Guotao3; Lei, Yu3
Corresponding AuthorCui, Peng(pengcui@imde.ac.cn)
2019-10-15
Source PublicationGEOMORPHOLOGY
ISSN0169-555X
Volume343Pages:15-32
AbstractLandslide damming of valleys may have a significant effect on the evolution of fluvial landscapes. The southeastern Tibetan Plateau is highly prone to landslide damming due to its deeply incised valleys and young, active geology. Here we present a sedimentological investigation of a landslide-dammed lake in the upper reach of Lulang River on the eastern Himalayan syntaxis. Detailed interpretation of lacustrine varve, lakeshore, and subaqueous delta sediment shows that Lulang landslide-dammed lake (LLDL) had a surface elevation of 3360 m a.s.l., an area of 33 x 10(6) m(2), and a volume of 6.5 x 10(2) m(3). Radiocarbon dating of six organic clay lacustrine samples demonstrate that LLDL formed before 24.2 ka cal. BP and persisted for at least 8.8 ka. Sediment infill reached full capacity soon after 15.4 ka cal. BP and fluvial conditions then prevailed. Sedimentary evidence and morphological analysis of cross sections along the LLDL outlet channel revealed a larger, earlier lake with a total volume of 4.3 x 10(9) m(3) and water surface elevation at 3570 m a.s.l. that failed catastrophically; the resulting outburst flood drained 98.5% of the impounded lake. The remnant lake maintained a relatively stable water level of 3360 m a.s.l. for its lifetime of at least 8.8 ka. Long profile and steepness index analysis indicate that the location of the catastrophic dam failure and subsequent long-term blockage is associated with a knickpoint. The origin of the knickpoint may have been polygenetic, however, the landslide damming seems to have increased its distinctiveness and persistence. The relatively wide valley and low channel slope characteristic of reaches upstream of LLDL is likely to have resulted from glacial activity, rather than backwater aggradation which had only a local influence. (C) 2019 Elsevier B.V. All rights reserved.
KeywordLulang River Landslide-dammed lake Sedimentary evidence Dam failure Longitudinal profile
DOI10.1016/j.geomorph.2019.06.023
Indexed BySCI
WOS KeywordEASTERN HIMALAYAN SYNTAXIS ; GLACIGENIC SUBAQUEOUS FAN ; SEDIMENT GRAVITY FLOWS ; LAST GLACIAL MAXIMUM ; LATE QUATERNARY ; BASE-LEVEL ; FLUVIAL RESPONSE ; OUTBURST FLOODS ; SLOPE FAILURES ; HYDRAULIC-JUMP
Language英语
Funding ProjectMajor International (Regional) Joint Research Project[41520104002] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-DQC 006] ; Major Program of National Natural Science Foundation of China[41790432]
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000483646300002
Funding OrganizationMajor International (Regional) Joint Research Project ; Key Research Program of Frontier Sciences, CAS ; Major Program of National Natural Science Foundation of China
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/26953
Collection山地灾害与地表过程重点实验室
Corresponding AuthorCui, Peng
Affiliation1.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing, Peoples R China
3.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100149, Peoples R China
Recommended Citation
GB/T 7714
Wang, Hao,Cui, Peng,Liu, Dingzhu,et al. Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles[J]. GEOMORPHOLOGY,2019,343:15-32.
APA Wang, Hao.,Cui, Peng.,Liu, Dingzhu.,Liu, Weiming.,Bazai, Nazir Ahmed.,...&Lei, Yu.(2019).Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles.GEOMORPHOLOGY,343,15-32.
MLA Wang, Hao,et al."Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles".GEOMORPHOLOGY 343(2019):15-32.
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