| DOI | 10.1088/1748-9326/ab8d80
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| Tributary oscillations generated by diurnal discharge regulation in Three Gorges Reservoir |
| Long L.H.; Ji D.B.; Yang Z.Y.; Cheng H.Q.; Yang Z.J.; Liu D.F.; Liu L.; Lorke A.
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| 发表日期 | 2020
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| ISSN | 17489318
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| 卷号 | 15期号:8 |
| 英文摘要 | Among the major consequences of dam construction and operation are the deterioration of water quality and the increasing frequency of occurrence of harmful algae blooms in reservoirs and their tributaries. Former studies at Three Gorges Reservoir demonstrated that the Yangtze River main stream is the main source of nutrients and pollutants to connected tributary bays. Eutrophication and other water quality problems reported for the tributaries along Three Gorges Reservoir are likely a consequence of density-driven exchange flows. Past work has focused mainly on the influence of seasonal and daily flow regulation on exchange flows, less attention has been paid to hydrodynamic processes resulting from sub-daily discharge dynamics. High-frequency measurements of flow velocity and water level in a eutrophic tributary (Xiangxi River) of Three Gorges Reservoir revealed the persistent nature of bidirectional density currents within the bay. Superimposed on this mean flow, we observed ubiquitous flow oscillations with a period of approximately 2 h. The flow variations were associated with periodic water level fluctuations with increasing amplitude for increasing distance from the river mouth (up to 0.1 m at a distance of 27.4 km from the river mouth). They were caused by a standing wave in the tributary bay, which was generated by rapid increase or decrease in discharge following peak-shaving operation modes at Three Gorges Dam. The high-frequency wave made up the largest contribution to the temporal variance of flow velocity in the tributary bay and represents a so far overlooked hydrodynamic feature of tributaries bays in large reservoirs. © 2020 The Author(s). Published by IOP Publishing Ltd. |
| 英文关键词 | discharge regulation; reservoir hydrodynamics; Three Gorges Reservoir; water level fluctuations |
| 语种 | 英语
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| scopus关键词 | Deterioration; Eutrophication; Flow velocity; Hydrodynamics; River pollution; Rivers; Water levels; Water quality; Flow oscillations; High frequency measurements; High frequency waves; Hydrodynamic process; Temporal variance; Three gorges reservoir; Water quality problems; Water-level fluctuation; Reservoirs (water); discharge; diurnal variation; oscillation; tributary; water quality; China; Three Gorges Reservoir; algae |
| 来源期刊 | Environmental Research Letters
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| 文献类型 | 期刊论文
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| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/153903
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| 作者单位 | Institute for Environmental Sciences, University of Koblenz-Landau, Landau, 76829, Germany; College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, 443002, China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China; Hubei Key Laboratory of River-lake Ecological Restoration and Algal Utilization, Hubei University of Technology, Wuhan, 430068, China; Department of Experimental Limnology, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Stechlin, 16775, Germany
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推荐引用方式
GB/T 7714 |
Long L.H.,Ji D.B.,Yang Z.Y.,et al. Tributary oscillations generated by diurnal discharge regulation in Three Gorges Reservoir[J],2020,15(8).
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| APA |
Long L.H..,Ji D.B..,Yang Z.Y..,Cheng H.Q..,Yang Z.J..,...&Lorke A..(2020).Tributary oscillations generated by diurnal discharge regulation in Three Gorges Reservoir.Environmental Research Letters,15(8).
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| MLA |
Long L.H.,et al."Tributary oscillations generated by diurnal discharge regulation in Three Gorges Reservoir".Environmental Research Letters 15.8(2020).
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