Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024413 |
Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs | |
Wang, Le1,2; Cuthbertson, Alan3; Pender, Gareth4; Zhong, Deyu1 | |
2019-07-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:7页码:5431-5452 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; Scotland |
英文摘要 | Flume experiments are conducted to investigate the intrinsic links between time-varying bed load transport properties for uniform sediments and bed surface morphology under unsteady hydrograph flows, in the absence of upstream sediment supply. These conditions are representative of regulated river reaches (e.g., downstream of a dam) that are subject to natural flood discharges or managed water releases, resulting in net degradation of the river bed. The results demonstrate that the hydrograph magnitude and unsteadiness have significant impacts on sediment transport rates and yields, as well as hysteresis patterns and yield ratios generated during the rising and falling limbs. A new hydrograph descriptor combining the influence of total water work and unsteadiness on bed load transport is shown to delineate these hysteresis patterns and yield ratios while correlating strongly with overall sediment yields. This provides an important parametric link between unsteady hydrograph flow conditions, bed load transport, and bed surface degradation under imposed zero sediment feed conditions. As such, maximum bed erosion depths and the longitudinal bed degradation profiles along the flume are strongly dependent on the magnitude of this new hydrograph descriptor. Similarly, nonequilibrium bedforms generated along the flume indicate that formative conditions for alternate bars, mixed bar/dunes, or dunes are defined reasonably well by an existing morphological model and the new hydrograph descriptor. These findings provide a new framework for improved predictive capabilities for sediment transport and morphodynamic response in regulated rivers to natural or imposed unsteady flows, while their wider application to graded sediments is also considered. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000481444700015 |
WOS关键词 | RIVER ; BEDLOAD ; EVENTS |
WOS类目 | Environmental Sciences ; Limnology ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/184837 |
专题 | 资源环境科学 |
作者单位 | 1.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing, Peoples R China; 2.Ningxia Univ, Sch Civil & Hydraul Engn, Yinchuan, Peoples R China; 3.Univ Dundee, Sch Sci & Engn Civil Engn, Dundee, Scotland; 4.Heriot Watt Univ, Sch Energy Geosci Infrastruct & Soc, Edinburgh, Midlothian, Scotland |
推荐引用方式 GB/T 7714 | Wang, Le,Cuthbertson, Alan,Pender, Gareth,et al. Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs[J]. WATER RESOURCES RESEARCH,2019,55(7):5431-5452. |
APA | Wang, Le,Cuthbertson, Alan,Pender, Gareth,&Zhong, Deyu.(2019).Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs.WATER RESOURCES RESEARCH,55(7),5431-5452. |
MLA | Wang, Le,et al."Bed Load Sediment Transport and Morphological Evolution in a Degrading Uniform Sediment Channel Under Unsteady Flow Hydrographs".WATER RESOURCES RESEARCH 55.7(2019):5431-5452. |
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