Particle size differentiation explains flow regulation controls on sediment sorting in the water-level fluctuation zone of the Three Gorges Reservoir, China
文献类型：期刊论文
| 作者 | Tang, Qiang1,2 ; Collins, Adrian L.2; Wen, Anbang1; He, Xiubin1; Bao, Yuhai1; Yan, Dongchun1; Long, Yi1; Zhang, Yusheng2
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2018-08-15 |
| 卷号 | 633页码:1114-1125 |
| ISSN号 | 0048-9697 |
| 关键词 | Flow regulation Hydrological continuity Particle size Sediment sorting Water-level fluctuation zone Three Gorges Reservoir |
| DOI | 10.1016/j.scitotenv.2018.03.258 |
| 英文摘要 | The 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. |
| 语种 | 英语 |
| 出版者 | ELSEVIER SCIENCE BV |
| WOS记录号 | WOS:000432475300107 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/21293]  |
| 专题 | 成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室 科技与合作处 |
| 通讯作者 | Yan, Dongchun |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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