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Laboratory study on the evolution of gravel-bed surfaces in bed armoring processes
Zhang, Shiyan1; Zhu, Zhenhui1,2; Peng, Jia1,2; He, Li1; Chen, Dong1,2
2021-06-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume597Pages:14
Corresponding AuthorZhang, Shiyan(zhangshy@igsnrr.ac.cn) ; Chen, Dong(dchen@igsnrr.ac.cn)
AbstractCluster 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.
KeywordBed armoring Surface coarsening Cluster microform Bedload transport Ripley's K
DOI10.1016/j.jhydrol.2020.125751
WOS KeywordPOINT PATTERN-ANALYSIS ; TURBULENT FLOWS ; SEDIMENT TRANSPORT ; PARTICLE CLUSTERS ; LOAD TRANSPORT ; FRICTION ANGLE ; SAND CONTENT ; RIVER BEDS ; SIZE ; ENTRAINMENT
Indexed BySCI
Language英语
Funding ProjectNational 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]
Funding OrganizationNational 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
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000652835600017
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/163910
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Shiyan; Chen, Dong
Affiliation1.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
Recommended Citation
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.
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