Runout and entrainment analysis of an extremely large rock avalanche-a case study of Yigong, Tibet, China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部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

	Runout and entrainment analysis of an extremely large rock avalanche-a case study of Yigong, Tibet, China
	Kang, Chao 1; Chan, Dave 1,2; Su, Fenghuan3 ; Cui, Peng 3
刊名	LANDSLIDES
	2017-02-01
卷号	14 期号:1 页码:123-139
关键词	Rock avalanche Debris flow entrainment Yigong rock avalanche Debris runout modeling Soil erosion
ISSN号	1612-510X
通讯作者	Chao Kang
英文摘要	An extremely large rock avalanche occurred on April 9, 2000 at Yigong, Tibet, China. It started with an initial volume of material of 90 x 10(6) m(3) comprising mainly of loose material lying on the channel bed. The rock avalanche travelled around 10 km in horizontal distance and formed a 2.5-km-long by 2.5-km-wide depositional fan with a final volume of approximately 300 x 10(6) m(3). An energy-based debris flow runout model is used to simulate the movement process with a new entrainment model. The entrainment model considers both rolling and sliding motions in calculating the volume of eroded material. Entrainment calculation is governed by a second order partial differential equation which is solved using the finite difference method. During entrainment, it is considered that the total mass is changed due to basal erosion. Also the profile of the channel bed is adjusted accordingly due to erosion at the end of each calculation time step. For Yigong, the profile used in the simulation was extracted from a digital elevation model (DEM) with a resolution of 30 m x 30 m. Measurements obtained from site investigation, including deposition depth and flow height at specific location, are used to verify the model. Ground elevation-based DEM before and after the event is also used to verify the simulation results where access was difficult. It is found that the calculated runout distance and the modified deposition height agree with the field observations. Moreover, the back-calculated flow characteristics based on field observations, such as flow velocity, are also used for model verifications. The results indicate that the new entrainment model is able to capture the entrainment volume and depth, runout distance, and deposition height for this case.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Geological ; Geosciences, Multidisciplinary
研究领域[WOS]	Engineering ; Geology
关键词[WOS]	DEBRIS FLOWS ; MODEL ; BED ; ASSEMBLIES ; EROSION ; SLIDES
收录类别	SCI
语种	英语
WOS记录号	WOS:000393643900009
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/18497]
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
作者单位	1.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB, Canada 2.Three Gorges Univ, Coll Civil Engn & Architecture, Yichang, Peoples R China 3.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Peoples R China
推荐引用方式 GB/T 7714	Kang, Chao,Chan, Dave,Su, Fenghuan,et al. Runout and entrainment analysis of an extremely large rock avalanche-a case study of Yigong, Tibet, China[J]. LANDSLIDES,2017,14(1):123-139.
APA	Kang, Chao,Chan, Dave,Su, Fenghuan,&Cui, Peng.(2017).Runout and entrainment analysis of an extremely large rock avalanche-a case study of Yigong, Tibet, China.LANDSLIDES,14(1),123-139.
MLA	Kang, Chao,et al."Runout and entrainment analysis of an extremely large rock avalanche-a case study of Yigong, Tibet, China".LANDSLIDES 14.1(2017):123-139.