Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR025116 |
Generalization of Hop Distance-Time Scaling and Particle Velocity Distributions via a Two-Regime Formalism of Bedload Particle Motions | |
Wu, Zi1,2; Furbish, David3,4; Foufoula-Georgiou, Efi2,5 | |
2020 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | To date, there is no consensus on the probability distribution of particle velocities during bedload transport, with some studies suggesting an exponential-like distribution while others a Gaussian-like distribution. Yet, the form of this distribution is key for the determination of sediment flux and the dispersion characteristics of tracers in rivers. Combining theoretical analysis of the Fokker-Planck equation for particle motions, numerical simulations of the corresponding Langevin equation, and measurements of motion in high-speed imagery from particle-tracking experiments, we examine the statistics of bedload particle trajectories, revealing a two-regime distance-time (L-T-p) scaling for the particle hops (measured from start to stop). We show that particles of short hop distances scale as L similar to T-p(2) giving rise to the Weibull-like front of the hop distance distribution, while particles of long hop distances transition to a different scaling regime of L similar to T-p leading to the exponential-like tail of the hop distance distribution. By demonstrating that the predominance of mostly long hop particles results in a Gaussian-like velocity distribution, while a mixture of both short and long hop distance particles leads to an exponential-like velocity distribution, we argue that the form of the probability distribution of particle velocities can depend on the physical environment within which particle transport occurs, explaining and unifying disparate views on particle velocity statistics reported in the literature. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000520132500002 |
WOS关键词 | BED-LOAD TRANSPORT ; SEDIMENT TRANSPORT ; NUMERICAL-SIMULATION ; DIFFUSION ; ENTRAINMENT ; ADVECTION ; BEHAVIOR ; MODEL |
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/280472 |
专题 | 资源环境科学 |
作者单位 | 1.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing, Peoples R China; 2.Univ Calif Irvine, Dept Civil & Environm Engn, Irvine, CA 92697 USA; 3.Vanderbilt Univ, Dept Earth & Environm Sci, 221 Kirkland Hall, Nashville, TN 37235 USA; 4.Vanderbilt Univ, Dept Civil & Environm Engn, Nashville, TN 37235 USA; 5.Univ Calif Irvine, Dept Earth Syst Sci, Irvine, CA 92697 USA |
推荐引用方式 GB/T 7714 | Wu, Zi,Furbish, David,Foufoula-Georgiou, Efi. Generalization of Hop Distance-Time Scaling and Particle Velocity Distributions via a Two-Regime Formalism of Bedload Particle Motions[J]. WATER RESOURCES RESEARCH,2020,56(1). |
APA | Wu, Zi,Furbish, David,&Foufoula-Georgiou, Efi.(2020).Generalization of Hop Distance-Time Scaling and Particle Velocity Distributions via a Two-Regime Formalism of Bedload Particle Motions.WATER RESOURCES RESEARCH,56(1). |
MLA | Wu, Zi,et al."Generalization of Hop Distance-Time Scaling and Particle Velocity Distributions via a Two-Regime Formalism of Bedload Particle Motions".WATER RESOURCES RESEARCH 56.1(2020). |
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