Experimental Study on Uniform and Mixed Bed-Load Sediment Transport under Unsteady Flow

doi:10.3390/app10062002

	Experimental Study on Uniform and Mixed Bed-Load Sediment Transport under Unsteady Flow
	Duan, Zihao 1,2,3; Chen, Jie 1,4; Jiang, Changbo 1,4; Liu, Xiaojian 5; Zhao, Bingbing 6
刊名	APPLIED SCIENCES-BASEL
	2020-03-01
卷号	10 期号:6 页码:21
关键词	unsteady flow non-uniform and non-cohesive sediment unsteady sediment transport bed-load transport
DOI	10.3390/app10062002
通讯作者	Chen, Jie(chenjie166@csust.edu.cn)
英文摘要	The scouring and deposition of sediment caused by unsteady flows (e.g., storm waves and floods) produces many secondary disasters. The resultant bed-load movement exhibits different transport laws compared with that by steady flow. In this study, the flume experiments were performed to study the bed-load movement under unsteady flow with different velocity skewness. The movement of uniform and non-uniform non-cohesive sediment under unsteady flow as well as the influence of the steady and unsteady flow on sediment transport rate are compared. Additionally, the non-uniform sediment transport formula of fine-to-coarse particle diameter ratio was investigated. The results showed that the sediment transport rate between uniform and non-uniform sand under the same median diameter is different. The non-uniform sediment transport rate is 1.27-, 3.19-, and 0.68-times as large as that in uniform sediment under d(50) = 0.664, 1.333, and 2.639 mm under unsteady flow, respectively. For non-uniform sand, the transport rate of non-uniform sand with a larger adjacent particle size ratio (delta = 0.29) was 1.31-times greater than that of the non-uniform sand with a smaller adjacent particle size ratio (delta = 0.50). Moreover, theoretical deduction was carried out and the incipient sediment motion was analyzed from the force mechanism. A new unsteadiness parameter based on the acceleration concept was proposed. The relationship between the travel distance and velocity skewness of sediment particles was set up. The experimental results and theoretical analysis showed that sediment under unsteady flow were easier to start and transport than those under steady flow in the same flow effect. The travel distance of sediment particles was longer under unsteady flow than that under steady flow.
资助项目	National Natural Science Foundation of China[51979014] ; National Natural Science Foundation of China[51839002] ; Natural Science Foundation of Hunan Province, China[2018JJ3546] ; Key Project of Scientific Research Project of Education Department of Hunan Province, China[18A123]
WOS关键词	GRAVEL ; INITIATION ; THRESHOLD ; MOVEMENT ; VELOCITY ; STREAMS ; RIVERS ; SAND
WOS研究方向	Chemistry ; Engineering ; Materials Science ; Physics
语种	英语
出版者	MDPI
WOS记录号	WOS:000529252800103
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Hunan Province, China ; Key Project of Scientific Research Project of Education Department of Hunan Province, China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/159688]
专题	中国科学院地理科学与资源研究所
通讯作者	Chen, Jie
作者单位	1.Changsha Univ Sci & Technol, Sch Hydraul Engn, Changsha 410114, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Key Lab Ecosyst Network Observat & Modeling, Beijing 100049, Peoples R China 4.Key Lab Dongting Lake Aquat Ecoenvironm Control &, Changsha 410114, Peoples R China 5.Pearl River Water Resources Commiss Minist Water, Pearl River Hydraul Res Inst, Guangzhou 510611, Peoples R China 6.China Railway Fifth Survey & Design Inst Grp Co L, Beijing 102600, Peoples R China
推荐引用方式 GB/T 7714	Duan, Zihao,Chen, Jie,Jiang, Changbo,et al. Experimental Study on Uniform and Mixed Bed-Load Sediment Transport under Unsteady Flow[J]. APPLIED SCIENCES-BASEL,2020,10(6):21.
APA	Duan, Zihao,Chen, Jie,Jiang, Changbo,Liu, Xiaojian,&Zhao, Bingbing.(2020).Experimental Study on Uniform and Mixed Bed-Load Sediment Transport under Unsteady Flow.APPLIED SCIENCES-BASEL,10(6),21.
MLA	Duan, Zihao,et al."Experimental Study on Uniform and Mixed Bed-Load Sediment Transport under Unsteady Flow".APPLIED SCIENCES-BASEL 10.6(2020):21.