Granular sediment deposition and aggregation upstream of a check darn: A discrete element study

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

	Granular sediment deposition and aggregation upstream of a check darn: A discrete element study
	Zou, Yuhua; Chen, Xiaoqing
刊名	POWDER TECHNOLOGY
	2017-02-01
卷号	307 期号:2017 页码:90-98
关键词	Discrete element method Granular flows Deposition process Spatial distribution Channel slope Check dam
ISSN号	0032-5910
通讯作者	Xiaoqing CHEN
英文摘要	A check dam, which has geomorphological effect as its essential function, is commonly used to address granular flows. This paper aims to study the dynamic mechanisms of granular sediments that aggregate and deposit upstream of a check dam by using the discrete element method. On the basis of a particle flow numerical model, the paper traced and studied the evolution of velocities and spatial distribution of granular sediments upstream of a check dam. The storage capacity and back-silt length of three types of granular sediments upstream of a check dam with various heights on a channel bed with different slopes were calculated and analyzed. Simulation results show that besides the granular particles that have passed across the dam, those with larger velocities approach the stable deposition state faster upstream of the dam. Generally, particles with coarse grain size move faster than those with fine grain size. Aggregation inversion occurred during deposition; the largest particle size group accounts for the largest mass ratio of the upper layer and the ratio increases with the maximum grain size of the granular flow, while the smallest particle size group accounts for the largest ratio of the bottom layer and the ratio decreases with the increase in the maximum grain size of the granular flow. After a small group of particles was deposited upstream of the dam, the subsequent particles climbed onto the previous deposition with a vertical velocity distribution that was larger at the top. The storage volume and back-deposit length increase with dam height and exponentially decrease with channel slope. A faster rate of decrease with the channel slope was observed when the dam is higher or when the maximum grain size decreases. This study could provide references for the design of check dams to mitigate granular flow hazards. (C) 2016 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Engineering, Chemical
研究领域[WOS]	Engineering
关键词[WOS]	DEBRIS FLOWS ; DAMS ; MODEL ; COEFFICIENT ; RESTITUTION ; SIMULATION ; IMPACTS ; DEM
收录类别	SCI
语种	英语
WOS记录号	WOS:000392570800010
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/17874]
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	Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Zou, Yuhua,Chen, Xiaoqing. Granular sediment deposition and aggregation upstream of a check darn: A discrete element study[J]. POWDER TECHNOLOGY,2017,307(2017):90-98.
APA	Zou, Yuhua,&Chen, Xiaoqing.(2017).Granular sediment deposition and aggregation upstream of a check darn: A discrete element study.POWDER TECHNOLOGY,307(2017),90-98.
MLA	Zou, Yuhua,et al."Granular sediment deposition and aggregation upstream of a check darn: A discrete element study".POWDER TECHNOLOGY 307.2017(2017):90-98.