气候变化领域集成服务门户(CCPortal): Geomorphic processes of a dammed palaeo-lake in the middle Yarlung Tsangpo River, Tibet

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DOI	10.1016/j.scitotenv.2021.151949
	Geomorphic processes of a dammed palaeo-lake in the middle Yarlung Tsangpo River, Tibet
	Hu, Hai-Ping; Liu, Jin-Hua; Feng, Jin-Liang; Ye, Chang-Sheng; Gong, Zhi-Jun; Lv, Feng; Chen, Feng; Chen, Liu-Qin; Du, Ding-Ding
通讯作者	Hu, HP (通讯作者)
发表日期	2022
ISSN	0048-9697
EISSN	1879-1026
卷号	811
英文摘要	The failure of a natural dam is an extreme geological event. Palaeo-lake sediments were discovered in the broad Xigaze valley and Dazhuka-Yueju gorge in the middle reach of the Yarlung Tsangpo River in Tibet. However, the sedimentary processes, dam failure, and peak flood of the Xigaze dammed palaeo-lake are poorly understood. Hence, we conducted a field survey of eight lacustrine sedimentary terraces in the area. We divided the sedimentary processes of the palaeo-lake into five stages and deposit types: pre-palaeo-lake sediments (fluvial or aeolian deposits); early stage sediments of the palaeo-lake (coarse sand); main stage palaeo-lake sediments (clayey silt and sand), sediments following the discharge of the palaeo-lake (sand and gravel-cobbles); and cover deposits (aeolian sediments and colluvium). Additionally, the water level along the palaeo-lake was almost constant (3811 m a.s.l.). The dam was likely located at the eastern end of the Dazhuka-Yueju gorge. Based on the water level, dam location and 30-m ASTER GDEM2 data, the capacity of the palaeo-lake was estimated as 22.55 km(3). To separate the water volume and sediment volume, the sediment surface elevation along the palaeo-lake was simulated based on the elevations of the six lacustrine sedimentary terraces. The volume of the sediment was similar to 11.56 km(3), which was calculated from the dam location, sediment surface elevation, and the ASTER GDEM2 data. Finally, subtraction of the sediment volume from the capacity of the palaeo-lake gave a backwater volume of 10.99 km(3). The peak flood possibly exceeded 3.4 x 10(5) m(3)/s as a moraine dam joined the discharge during the dam failure. However, the dammed event probably had a limited effect on the landforms at downstream because of the presence of another dammed palaeo-lake in the broad Zetang valley; moreover, the bedrock upstream of the dam was protected from erosion. (C) 2021 Elsevier B.V. All rights reserved.
关键词	LATE PLEISTOCENE VALLEY GORGE PLATEAU EROSION SEDIMENTATION MEGAFLOODS INCISION GLACIER CANYON
英文关键词	Dammed palaeo-lake; Sedimentary characteristics; Sediment volume; Discharge flood
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000767249700003
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/260610
推荐引用方式 GB/T 7714	Hu, Hai-Ping,Liu, Jin-Hua,Feng, Jin-Liang,et al. Geomorphic processes of a dammed palaeo-lake in the middle Yarlung Tsangpo River, Tibet[J]. 中国科学院青藏高原研究所,2022,811.
APA	Hu, Hai-Ping.,Liu, Jin-Hua.,Feng, Jin-Liang.,Ye, Chang-Sheng.,Gong, Zhi-Jun.,...&Du, Ding-Ding.(2022).Geomorphic processes of a dammed palaeo-lake in the middle Yarlung Tsangpo River, Tibet.SCIENCE OF THE TOTAL ENVIRONMENT,811.
MLA	Hu, Hai-Ping,et al."Geomorphic processes of a dammed palaeo-lake in the middle Yarlung Tsangpo River, Tibet".SCIENCE OF THE TOTAL ENVIRONMENT 811(2022).