Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017WR020604 |
Sediment Transport of Fine Sand to Fine Gravel on Transverse Bed Slopes in Rotating Annular Flume Experiments | |
Baar, Anne W.1; de Smit, Jaco1,2; Uijttewaal, Wim S. J.3; Kleinhans, Maarten G.1 | |
2018 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:1页码:19-45 |
文章类型 | Article |
语种 | 英语 |
国家 | Netherlands |
英文摘要 | Large-scale morphology, in particular meander bend depth, bar dimensions, and bifurcation dynamics, are greatly affected by the deflection of sediment transport on transverse bed slopes due to gravity and by secondary flows. Overestimating the transverse bed slope effect in morphodynamic models leads to flattening of the morphology, while underestimating leads to unrealistically steep bars and banks and a higher braiding index downstream. However, existing transverse bed slope predictors are based on a small set of experiments with a minor range of flow conditions and sediment sizes, and in practice models are calibrated on measured morphology. The objective of this research is to experimentally quantify the transverse bed slope effect for a large range of near-bed flow conditions with varying secondary flow intensity, sediment sizes (0.17-4 mm), sediment transport mode, and bed state to test existing predictors. We conducted over 200 experiments in a rotating annular flume with counterrotating floor, which allows control of the secondary flow intensity separate from the streamwise flow velocity. Flow velocity vectors were determined with a calibrated analytical model accounting for rough bed conditions. We isolated separate effects of all important parameters on the transverse slope. Resulting equilibrium transverse slopes show a clear trend with varying sediment mobilities and secondary flow intensities that deviate from known predictors depending on Shields number, and strongly depend on bed state and sediment transport mode. Fitted functions are provided for application in morphodynamic modeling. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428474000002 |
WOS关键词 | ARBITRARILY SLOPING BEDS ; LOW SHIELDS STRESS ; LOAD TRANSPORT ; CHANNEL ; MODEL ; RIVER ; FLOW ; ENTRAINMENT ; MIGRATION ; DYNAMICS |
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/21531 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Utrecht, Fac Geosci, Utrecht, Netherlands; 2.NIOZ Royal Netherlands Inst Sea Res, Dept Estuarine & Delta Syst, Yerseke, Netherlands; 3.Delft Univ Technol, Fac Civil Engn & Geosci, Delft, Netherlands |
推荐引用方式 GB/T 7714 | Baar, Anne W.,de Smit, Jaco,Uijttewaal, Wim S. J.,et al. Sediment Transport of Fine Sand to Fine Gravel on Transverse Bed Slopes in Rotating Annular Flume Experiments[J]. WATER RESOURCES RESEARCH,2018,54(1):19-45. |
APA | Baar, Anne W.,de Smit, Jaco,Uijttewaal, Wim S. J.,&Kleinhans, Maarten G..(2018).Sediment Transport of Fine Sand to Fine Gravel on Transverse Bed Slopes in Rotating Annular Flume Experiments.WATER RESOURCES RESEARCH,54(1),19-45. |
MLA | Baar, Anne W.,et al."Sediment Transport of Fine Sand to Fine Gravel on Transverse Bed Slopes in Rotating Annular Flume Experiments".WATER RESOURCES RESEARCH 54.1(2018):19-45. |
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