气候变化领域集成服务门户(CCPortal): Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles

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DOI	10.1016/j.geomorph.2019.06.023
	Evolution of a landslide-dammed lake on the southeastern Tibetan Plateau and its influence on river longitudinal profiles
	Wang, Hao; Cui, Peng; Liu, Dingzhu; Liu, Weiming; Bazai, Nazir Ahmed; Wang, Jiao; Zhang, Guotao; Lei, Yu
通讯作者	Cui, P (通讯作者)
发表日期	2019
ISSN	0169-555X
EISSN	1872-695X
起始页码	15
结束页码	32
卷号	343
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.
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
英文关键词	Lulang River; Landslide-dammed lake; Sedimentary evidence; Dam failure; Longitudinal profile
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000483646300002
来源期刊	GEOMORPHOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259454
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]. 中国科学院青藏高原研究所,2019,343.
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.
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).