Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR024836 |
Threshold of Motion Conditions Under Stokes Flow Regime and Comparison With Turbulent Flow Data | |
Shih, WuRong; Diplas, Panayiotis | |
2019-12-17 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:12页码:10872-10892 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The present study numerically investigates the effects of bed geometrical properties on particle entrainment driven by Stokes flow. We use different substrate arrangements to alter two important factors: The angle of repose, phi, and degree of exposure, e, of the test particle. The effectiveness of shear flow in mobilizing surface particles will change with e and phi, or collectively, eta = e/tan phi, yielding a wide range of critical Shields parameter, theta(c), values. The use of eta is better suited for describing local bed geometry as both e and phi values will change simultaneously during substrate rearranging processes. Furthermore, the range of theta(c) values obtained in this study stems from the limitation of this parameter to relate the applied force variation to local flow and bed conditions. We therefore propose an effective shear ratio, alpha, to establish such connections between the global and local flow shear intensities. These results provide a unique perspective to examine typical theta(c) data obtained from both Stokes and turbulence regimes. For the case of a single-particle entrainment under given grain protrusion, Stokes flow-based theta(c) values are found to be 2 to 3 times larger than the counterpart turbulence data. For the case of channel bed mobility, however, the Shields curve suggests an order of magnitude difference in theta(c) between the two regimes. In part, we attribute this significant theta(c) variation to turbulent flow fluctuations in the first case and varied bed mobility levels in the second, given their distinct theoretical and empirical nature, respectively. |
英文关键词 | Global and local flow properties Bed microstructure Effective shear ratio The Shields diagram Single grain entrainment Channel bed mobility |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000503205500001 |
WOS关键词 | BED-LOAD TRANSPORT ; CRITICAL SHEAR-STRESS ; INCIPIENT MOTION ; BEDLOAD TRANSPORT ; SEDIMENT ENTRAINMENT ; FRICTION ANGLE ; PARTICLE ; MOVEMENT ; EROSION ; FORCES |
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/223989 |
专题 | 资源环境科学 |
作者单位 | Lehigh Univ, Dept Civil & Environm Engn, Bethlehem, PA 18015 USA |
推荐引用方式 GB/T 7714 | Shih, WuRong,Diplas, Panayiotis. Threshold of Motion Conditions Under Stokes Flow Regime and Comparison With Turbulent Flow Data[J]. WATER RESOURCES RESEARCH,2019,55(12):10872-10892. |
APA | Shih, WuRong,&Diplas, Panayiotis.(2019).Threshold of Motion Conditions Under Stokes Flow Regime and Comparison With Turbulent Flow Data.WATER RESOURCES RESEARCH,55(12),10872-10892. |
MLA | Shih, WuRong,et al."Threshold of Motion Conditions Under Stokes Flow Regime and Comparison With Turbulent Flow Data".WATER RESOURCES RESEARCH 55.12(2019):10872-10892. |
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