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Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles

文献类型：期刊论文

作者Wang, Hao1,2,3,4; Cui, Peng1,3; Liu, Dingzhu3,4; Liu, Weiming3; Bazai, Nazir Ahmed3,4; Wang, Jiao3; Zhang, Guotao3; Lei, Yu3
刊名GEOMORPHOLOGY
出版日期2019-10-15
卷号343页码:15-32
ISSN号0169-555X
关键词Lulang River Landslide-dammed lake Sedimentary evidence Dam failure Longitudinal profile
DOI10.1016/j.geomorph.2019.06.023
通讯作者Cui, Peng(pengcui@imde.ac.cn)
英文摘要Landslide 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.
WOS关键词EASTERN HIMALAYAN SYNTAXIS ; GLACIGENIC SUBAQUEOUS FAN ; SEDIMENT GRAVITY FLOWS ; LAST GLACIAL MAXIMUM ; LATE QUATERNARY ; BASE-LEVEL ; FLUVIAL RESPONSE ; OUTBURST FLOODS ; SLOPE FAILURES ; HYDRAULIC-JUMP
资助项目Major 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研究方向Physical Geography ; Geology
语种英语
出版者ELSEVIER
WOS记录号WOS:000483646300002
资助机构Major International (Regional) Joint Research Project ; Key Research Program of Frontier Sciences, CAS ; Major Program of National Natural Science Foundation of China
源URL[http://ir.imde.ac.cn/handle/131551/26953]  
专题成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者Cui, Peng
作者单位1.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
推荐引用方式
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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来源：成都山地灾害与环境研究所

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