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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
Source PublicationGEOMORPHOLOGY
Contribution Rank3
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
Indexed BySCI
WOS IDWOS:000483646300002
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Document Type期刊论文
Corresponding AuthorCui Peng
Affiliation1.CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China;
2.Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China;
3.Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
4.University of Chinese Academy of Sciences, Beijing 100149, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding 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
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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