IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir, China
Tang, Qiang1,2; Collins, Adrian L.2; Wen, Anbang1; He, Xiubin1; Bao, Yuhai1; Yan, Dongchun1; Long, Yi1; Zhang, Yusheng2
2018-08-15
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume633Pages:1114-1125
AbstractThe Three Gorges Dam has significantly interrupted fluvial continuity and modified the mass transfer regime along river continuums. Flow regulation following regular dam operations drives dramatic hydrological regime shifts, which facilitates sediment dispersal in the water-level fluctuation zone over episodic inundation periods. How flow regulation modulates sediment redistribution, however, remains unclear. In this study, we depict absolute particle size composition of suspended sediment and sink sediment in the water-level fluctuation zone, and these are interpreted in the context of flow regulation controls on sediment sorting. Multiple sampling strategies were applied at different spatial and temporal scales, to overcome limitations of labour and cost input in a large-scale field study and to collect representative samples. The results revealed a longitudinal fining trend and seasonal variability in particle size composition for suspended sediment. Sink sediment collected from the water-level fluctuation zone during a single summer flood event displayed a similar longitudinal fining trend, reflecting preferential settling of coarser fractions in the backwater reaches where flow velocity declines sharply. Surface sediment demonstrated a laterally coarsening trend with increasing elevations along a slope profile. Flooding duration, frequency and timing represent key factors in determining the elevation-dependent variations in the magnitude of sedimentation and its source inputs. Relatively longer flooding duration and frequent intermediate summer floods with high suspended sediment flux are responsible for high sedimentation rates in the lower portions with distal upstream source inputs, while low sedimentation rates in the upper portions are principally associated with water impoundment and sediment produced from local bank erosion. Vertical particle size variability was observed along a sedimentary core profile, which most likely reflects seasonal differences in source supply with contrasting particle size characteristics. We conclude that absolute particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir. (C) 2018 Elsevier B.V. All rights reserved.
KeywordFlow regulation Hydrological continuity Particle size Sediment sorting Water-level fluctuation zone Three Gorges Reservoir
DOI10.1016/j.scitotenv.2018.03.258
WOS KeywordCHANGJIANG YANGTZE-RIVER ; FLUVIAL SUSPENDED SEDIMENT ; DAM CONSTRUCTION ; IMPACTS ; SEA ; PHOSPHORUS ; CATCHMENTS ; TRANSPORT ; SYSTEMS ; MIDDLE
Language英语
Funding ProjectNational Natural Science Foundation of China[41771320] ; National Natural Science Foundation of China[41771321] ; National Natural Science Foundation of China[41571278] ; Chinese Academy of Sciences (CAS)[KFJ-SW-STS-175] ; CAS Key Laboratory of Mountain Surface Processes and Ecological Regulation ; UK Royal Society Newton International Fellowship scheme[NF161415] ; UK Biotechnology and Biological Sciences Research Council (BBSRC) ; [BBS/E/C/000I0330]
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000432475300107
Funding OrganizationNational Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) ; CAS Key Laboratory of Mountain Surface Processes and Ecological Regulation ; UK Royal Society Newton International Fellowship scheme ; UK Biotechnology and Biological Sciences Research Council (BBSRC)
PublisherELSEVIER SCIENCE BV
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Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/21293
Collection山地表生过程与生态调控重点实验室
科技与合作处
Corresponding AuthorYan, Dongchun
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China
2.Rothamsted Res, Sustainable Agr Sci Dept, Okehampton EX20 2SB, Devon, England
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Tang, Qiang,Collins, Adrian L.,Wen, Anbang,et al. Particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,633:1114-1125.
APA Tang, Qiang.,Collins, Adrian L..,Wen, Anbang.,He, Xiubin.,Bao, Yuhai.,...&Zhang, Yusheng.(2018).Particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir, China.SCIENCE OF THE TOTAL ENVIRONMENT,633,1114-1125.
MLA Tang, Qiang,et al."Particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir, China".SCIENCE OF THE TOTAL ENVIRONMENT 633(2018):1114-1125.
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