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DOI | 10.1002/2017GL076937 |
Aeolian Sand Transport in Out-of-Equilibrium Regimes | |
Selmani, H.1,4; Valance, A.1; El Moctar, A. Ould2; Dupont, P.3; Zegadi, R.4 | |
2018-02-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:4页码:1838-1844 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Algeria |
英文摘要 | We investigate the relaxation process toward the equilibrium regime of saltation transport in the context of nonuniform conditions. Relaxation phenomena can be described in terms of a characteristic length scale that measures the distance for the particle flux to adapt to a spatial change in flow or boundary conditions. We conducted wind tunnel experiments to document the influence of the upwind mass flux on the relaxation process. For zero upwind mass flux conditions, the relaxation process is monotone and the relaxation length is independent of the wind strength. In contrast, for nonzero upwind flux conditions (obtained by releasing particles in the flow from a finite height), the relaxation process is nonmonotone and is well captured by damped harmonic oscillations. Importantly, the relaxation length increases with increasing air flow velocity but is almost insensitive to the magnitude of the upwind flux. Our experimental outcomes clearly indicate that the relaxation of far from equilibrium transport regimes strongly deviates from a simple exponential behavior. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000427564300016 |
WOS关键词 | SALTATION ; DUNES ; MODEL |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28301 |
专题 | 气候变化 |
作者单位 | 1.Univ Rennes 1, Inst Phys Rennes, UMR CNRS 6251 UR1, Rennes, France; 2.Polytech Nantes, Lab Therm & Energie Nantes, CNRS UMR 6607, Nantes, France; 3.INSA Rennes, LGCGM, Campus Beaulieu, Rennes, France; 4.Univ Ferhat Abbas, Inst Opt & Mecan Precis, Lab Mecan Precis Appl, Setif 1, Algeria |
推荐引用方式 GB/T 7714 | Selmani, H.,Valance, A.,El Moctar, A. Ould,et al. Aeolian Sand Transport in Out-of-Equilibrium Regimes[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(4):1838-1844. |
APA | Selmani, H.,Valance, A.,El Moctar, A. Ould,Dupont, P.,&Zegadi, R..(2018).Aeolian Sand Transport in Out-of-Equilibrium Regimes.GEOPHYSICAL RESEARCH LETTERS,45(4),1838-1844. |
MLA | Selmani, H.,et al."Aeolian Sand Transport in Out-of-Equilibrium Regimes".GEOPHYSICAL RESEARCH LETTERS 45.4(2018):1838-1844. |
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