Statistical Analysis of Bed Load Transport over an Armored Bed Layer with Cluster Microforms

doi:10.3390/w11102082

	Statistical Analysis of Bed Load Transport over an Armored Bed Layer with Cluster Microforms
	Zhu, Zhenhui 1,2; Zhang, Shiyan 1; Chen, Dong 1,2
刊名	WATER
	2019-10-01
卷号	11 期号:10 页码:17
关键词	particle clusters bed load transport heavy-tailed distribution particle diffusion anomalous transport
DOI	10.3390/w11102082
通讯作者	Zhang, Shiyan(zhangshy@igsnrr.ac.cn) ; Chen, Dong(dchen@igsnrr.ac.cn)
英文摘要	River engineers have long been challenged by the need to predict sediment transport, especially over armored riverbeds. This study investigates the statistical properties of bed load transport over an armored bed layer with cluster microforms in laboratory experiments. Particle clusters on the sediment bed were formed by widely graded particles under constant flow. A series of key kinematic parameters computed from particle trajectories recorded by a digital camcorder, including mean squared particle displacement (MSD), particle number activity, particle velocities, step length, and rest period, were analyzed. The scaling growth of the MSD with time showed that the particle diffusion regime was superdiffusive at small time scales, but became subdiffusive at larger time scales. The particle number activity follows a negative binomial distribution, and the probability distributions of streamwise and transverse particle velocities displayed heavy asymptotic tails, which indicates the particle clusters might exert a dual impact on bed load transport: some particles are accelerated in the preferential paths between particle clusters, while others were obstructed by the particle clusters. In addition, the bed load diffusion regime varied with observation time scales. The findings of this study can gain insight into the bed load transport processes over armored riverbeds.
资助项目	National Key R&D Program of China[2017YFC0405203] ; National Natural Science Foundation of China[51779242] ; National Natural Science Foundation of China[51579230] ; Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences[WL2018001] ; Hundred Talents Program of Chinese Academy of Sciences
WOS关键词	ANOMALOUS DIFFUSION ; PARTICLE CLUSTERS ; STOCHASTIC-THEORY ; RIVERS ; MODEL ; ENTRAINMENT ; BEHAVIOR ; MOTION ; DISTRIBUTIONS ; DERIVATION
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000495598400126
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences ; Hundred Talents Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/131803]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Shiyan; Chen, Dong
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Zhenhui,Zhang, Shiyan,Chen, Dong. Statistical Analysis of Bed Load Transport over an Armored Bed Layer with Cluster Microforms[J]. WATER,2019,11(10):17.
APA	Zhu, Zhenhui,Zhang, Shiyan,&Chen, Dong.(2019).Statistical Analysis of Bed Load Transport over an Armored Bed Layer with Cluster Microforms.WATER,11(10),17.
MLA	Zhu, Zhenhui,et al."Statistical Analysis of Bed Load Transport over an Armored Bed Layer with Cluster Microforms".WATER 11.10(2019):17.