IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Flow regulation manipulates contemporary seasonal sedimentary dynamics in the reservoir fluctuation zone of the Three Gorges Reservoir, China
Tang, Qiang1,2; Bao, Yuhai1; He, Xiubin1; Fu, Bojie2; Collins, Adrian L.3; Zhang, Xinbao1
Corresponding AuthorHe, Xiubin
2016
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
EISSN1879-1026
Volume548Pages:410-420
SubtypeArticle
AbstractSince the launch of the Three Gorges Damon the Yangtze River, a distinctive reservoir fluctuation zone has been created and significantly modified by regular dam operations. Sediment redistribution within this artificial landscape differs substantially from that in natural fluvial riparian zones, due to a specific hydrological regime comprising steps of water impoundment with increasing magnitudes and seasonal water level fluctuation holding a range of sediment fluxes. This study reinterpreted post-dam sedimentary dynamics in the reservoir fluctuation zone by stratigraphy determination of a 345-cm long sediment core, and related it to impact of the hydrological regime. Seasonality in absolute grain-size composition of suspended sediment was applied as a methodological basis for stratigraphic differentiation. Sedimentary laminations with relatively higher proportions of sandy fractions were ascribed to sedimentation during the dry season when proximal subsurface bank erosion dominates source contributions, while stratigraphy with a lower proportion of sandy fractions is possibly contributed by sedimentation during the wet season when distal upstream surface erosion prevails. Chronology determination revealed non-linear and high annual sedimentation rates ranging from 21.7 to 152.1 cm/yr. Although channel geomorphology may primarily determine the spatial extent of sedimentation, seasonal sedimentary dynamics was predominantly governed by the frequency, magnitude, and duration of flooding. Summer inundation by natural floods with enhanced sediment loads produced from upstream basins induced higher sedimentation rates than water impoundment during the dry season when distal sediment supply was limited. We thus conclude that flow regulation manipulates contemporary seasonal sedimentary dynamics in the reservoir fluctuation zone, though little impact on total sediment retention rate was detected. Ongoing reductions in flow and sediment supply under human disturbance may have profound implications in affecting sedimentary equilibrium in the reservoir fluctuation zone. The results herein provide insights of how big dams have disrupted the sediment conveyance processes of large scale fluvial systems. (C) 2016 Elsevier B.V. All rights reserved.
KeywordFlow Regulation Water Level Fluctuation Sedimentary Dynamics Stratigraphy Differentiation Reservoir Fluctuation Zone Three Gorges Dam
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
DOI10.1016/j.scitotenv.2015.12.158
WOS Subject ExtendedEnvironmental Sciences & Ecology
Indexed BySCI
WOS KeywordCHANGJIANG YANGTZE-RIVER ; SUSPENDED SEDIMENT ; LITTORAL-ZONE ; WORLDS RIVERS ; P.R. CHINA ; DAM ; IMPACT ; PROJECT ; SEA ; OCEAN
Language英语
Quartile2区
TOP
WOS SubjectEnvironmental Sciences
WOS IDWOS:000370246000043
Funding OrganizationNational Natural Science Foundation of China(41171222 ; Chinese Academy of Sciences(KZCX2-XB3-09) ; 41571278)
Citation statistics
Cited Times:60[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/15110
Collection山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan Provinc, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
3.Rothamsted Res, Sustainable Soils & Grassland Syst Dept, North Wyke EX20 2SB, Okehampton, England
First 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,Bao, Yuhai,He, Xiubin,et al. Flow regulation manipulates contemporary seasonal sedimentary dynamics in the reservoir fluctuation zone of the Three Gorges Reservoir, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016,548:410-420.
APA Tang, Qiang,Bao, Yuhai,He, Xiubin,Fu, Bojie,Collins, Adrian L.,&Zhang, Xinbao.(2016).Flow regulation manipulates contemporary seasonal sedimentary dynamics in the reservoir fluctuation zone of the Three Gorges Reservoir, China.SCIENCE OF THE TOTAL ENVIRONMENT,548,410-420.
MLA Tang, Qiang,et al."Flow regulation manipulates contemporary seasonal sedimentary dynamics in the reservoir fluctuation zone of the Three Gorges Reservoir, China".SCIENCE OF THE TOTAL ENVIRONMENT 548(2016):410-420.
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