Bursts in discontinuous Aeolian saltation
| Autor: | M. V. Carneiro, Hans J. Herrmann, K. R. Rasmussen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Scaling law Atmospheric dynamics Multidisciplinary Turbulence Astrophysics::High Energy Astrophysical Phenomena Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Mechanics Physics - Fluid Dynamics Nonlinear phenomena Sedimentology Particle transport Shields parameter Article Fluid dynamics Physics - Atmospheric and Oceanic Physics Saltation (geology) Atmospheric and Oceanic Physics (physics.ao-ph) Aeolian processes Wind tunnel |
| Zdroj: | Scientific Reports, 5 Scientific Reports Carneiro, M V, Rasmussen, K R & Herrmann, H J 2015, ' Bursts in discontinuous Aeolian saltation ', Scientific Reports, vol. 5, 11109 . https://doi.org/10.1038/srep11109 |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep11109 |
| Popis: | Close to the onset of Aeolian particle transport through saltation we find in wind tunnel experiments a regime of discontinuous flux characterized by bursts of activity. Scaling laws are observed in the time delay between each burst and in the measurements of the wind fluctuations at the fluid threshold Shields number θc. The time delay between each burst decreases on average with the increase of the Shields number until sand flux becomes continuous. A numerical model for saltation including the wind-entrainment from the turbulent fluctuations can reproduce these observations and gives insight about their origin. We present here also for the first time measurements showing that with feeding it becomes possible to sustain discontinuous flux even below the fluid threshold. Scientific Reports, 5 ISSN:2045-2322 |
| Databáze: | OpenAIRE |
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