气候变化领域集成服务门户(CCPortal): Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau

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DOI	10.1007/s12665-024-11426-3 ; 10.1007/s12665-024-11426-3
	Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau; Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau
	Li, Yanyan; Wang, Rui; Wei, Siyu; Han, Lili; Hu, Yifeng
发表日期	2024 ; 2024
ISSN	1866-6280 ; 1866-6280
EISSN	1866-6299 ; 1866-6299
卷号	83 期号:3
英文摘要	Large ancient landslides are widely distributed in the Jinsha River suture zone of the SE Qinghai-Tibet Plateau. Understanding how these landslides were triggered and moved is important for future landslide risk management. Here, a detailed investigation of an ancient river-damming landslide in this zone is conducted. Field survey suggests that the deep-seated landslide developed in a scarp rock slope composed of Mesoproterozoic gneiss and Paleozoic hornblende schist. The debris volume of the landslide is estimated to be 3.3 x 107 m3. Evidence of a landslide damming event, including dam remnants and upstream lacustrine sediments, has been well preserved. Optically stimulated luminescence dating shows the landslide formed at about 5.4 ka BP. The geological setting, frequent seismic activity, and characteristics of the landslide source area suggest that the landslide was most likely triggered by a strong earthquake. The movement process of the landslide under seismic shaking is simulated using the discrete element method, with the novelty of applying a viscoelastic boundary to the model to avoid seismic wave reflection at the slope base. The simulation results show that the progressive failure process of the landslide lasts 120 s, and could be divided into three stages: (1) rupture of the rock mass at t = 0-10 s, (2) formation of a sliding surface at t = 10-20 s, and (3) rapid movement of the landslide body with a maximum movement rate of 34 m/s and blockage of the river at t = 20-120 s. This study could provide guidance for understanding the dynamic process of ancient landslides in the Qinghai-Tibet Plateau.; Large ancient landslides are widely distributed in the Jinsha River suture zone of the SE Qinghai-Tibet Plateau. Understanding how these landslides were triggered and moved is important for future landslide risk management. Here, a detailed investigation of an ancient river-damming landslide in this zone is conducted. Field survey suggests that the deep-seated landslide developed in a scarp rock slope composed of Mesoproterozoic gneiss and Paleozoic hornblende schist. The debris volume of the landslide is estimated to be 3.3 x 107 m3. Evidence of a landslide damming event, including dam remnants and upstream lacustrine sediments, has been well preserved. Optically stimulated luminescence dating shows the landslide formed at about 5.4 ka BP. The geological setting, frequent seismic activity, and characteristics of the landslide source area suggest that the landslide was most likely triggered by a strong earthquake. The movement process of the landslide under seismic shaking is simulated using the discrete element method, with the novelty of applying a viscoelastic boundary to the model to avoid seismic wave reflection at the slope base. The simulation results show that the progressive failure process of the landslide lasts 120 s, and could be divided into three stages: (1) rupture of the rock mass at t = 0-10 s, (2) formation of a sliding surface at t = 10-20 s, and (3) rapid movement of the landslide body with a maximum movement rate of 34 m/s and blockage of the river at t = 20-120 s. This study could provide guidance for understanding the dynamic process of ancient landslides in the Qinghai-Tibet Plateau.
关键词	River-damming landslide River-damming landslide Ancient landslide Ancient landslide Failure mechanism Failure mechanism Movement process Movement process
英文关键词	JOINTED ROCK MASS; JINSHA RIVER; DAMMED LAKE; BEHAVIOR; MODEL; AVALANCHE; STABILITY; EVOLUTION; HIMALAYA; SICHUAN; JOINTED ROCK MASS; JINSHA RIVER; DAMMED LAKE; BEHAVIOR; MODEL; AVALANCHE; STABILITY; EVOLUTION; HIMALAYA; SICHUAN
WOS研究方向	Environmental Sciences ; Environmental Sciences ; Geosciences, Multidisciplinary ; Geosciences, Multidisciplinary ; Water Resources ; Water Resources
WOS记录号	WOS:001153835500002 ; WOS:001153835500002
来源期刊	ENVIRONMENTAL EARTH SCIENCES ; ENVIRONMENTAL EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283097
作者单位	Beijing University of Technology; China Geological Survey; China Geological Survey; Chinese Academy of Geological Sciences
推荐引用方式 GB/T 7714	Li, Yanyan,Wang, Rui,Wei, Siyu,et al. Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau, Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau[J],2024, 2024,83, 83(3).
APA	Li, Yanyan,Wang, Rui,Wei, Siyu,Han, Lili,&Hu, Yifeng.(2024).Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau.ENVIRONMENTAL EARTH SCIENCES,83(3).
MLA	Li, Yanyan,et al."Potential failure mechanism and movement process of an ancient river-damming landslide in the SE Qinghai-Tibet Plateau".ENVIRONMENTAL EARTH SCIENCES 83.3(2024).