Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes

doi:10.1016/j.jhydrol.2020.125751

	Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes
	Zhang, Shiyan 2; Zhu, Zhenhui 1,2; Peng, Jia 1,2; He, Li 2; Chen, Dong 1,2
刊名	JOURNAL OF HYDROLOGY
	2021-06-01
卷号	597 页码:14
关键词	Bed armoring Surface coarsening Cluster microform Bedload transport Ripley's K
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2020.125751
通讯作者	Zhang, Shiyan(zhangshy@igsnrr.ac.cn) ; Chen, Dong(dchen@igsnrr.ac.cn)
英文摘要	Cluster microforms in bed armoring have important implications for bedload transport. In this study, two sets of flume experiments were carried out to study the evolution of the cluster microforms in the bed armoring and their influences on the bedload transport. Dynamically stable armor layers were formed by applying a staged hydrograph on a mobile sediment bed consisted of poorly sorted sand and gravel, thus enabling the investigation of the cluster microforms associated with different flow characteristics simulated in these experiments. The size and the planimetric positions of the large particles on the bed surface were extracted using photogrammetric technique, allowing analysis of surface grain size distribution and particle clustering pattern of the bed. The results showed a tendency towards a coarsened and clustered bed surface, which is likely responsible for the declining bedload transport rate. The cluster microforms evolved with increasing bed shear stress in the following sequence: flat bed - pebble cluster - line cluster - heap cluster - reticulate structure. We found a bed armoring statistics that can partially explain the declining bedload transport rate under constant discharge. Nonetheless, additional parameters are needed to simulate the fluctuation in the bedload transport rate under changing flow conditions.
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 ; Natural Resources Research, Chinese Academy of Sciences[WL2018001]
WOS关键词	POINT PATTERN-ANALYSIS ; TURBULENT FLOWS ; SEDIMENT TRANSPORT ; PARTICLE CLUSTERS ; LOAD TRANSPORT ; FRICTION ANGLE ; SAND CONTENT ; RIVER BEDS ; SIZE ; ENTRAINMENT
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000652835600017
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 ; Natural Resources Research, Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/163909]
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.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Shiyan,Zhu, Zhenhui,Peng, Jia,et al. Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes[J]. JOURNAL OF HYDROLOGY,2021,597:14.
APA	Zhang, Shiyan,Zhu, Zhenhui,Peng, Jia,He, Li,&Chen, Dong.(2021).Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes.JOURNAL OF HYDROLOGY,597,14.
MLA	Zhang, Shiyan,et al."Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes".JOURNAL OF HYDROLOGY 597(2021):14.