Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.45: Poster

Donnerstag, 25. März 2010, 16:00–18:00, Poster C

Turbulent fluctuations in the saltation process. Dust emission. — •Marc Lämmel and Klaus Kroy — Institut für Theoretische Physik, Universität Leipzig, PF 100920, 04009 Leipzig, Germany

Transport of granular material in turbulent flows is ubiquitous in nature, e.g. in aeolian sand transport, or dust emissions from arid regions. While the former is crucial for the development of ripples and dunes, the latter plays an important role for our global climate. Based on the efficient and successfull sand transport model by Sauermann et al. [1], we investigate the influence of turbulent fluctuations of the wind on the sand flux. By integrating out these fast turbulent wind velocity fluctuations, we obtain coarse-grained sand transport equations supposed to be more directly applicable to the average quantities typically determined in field and laboratory measurements. The model is further generalized to the sand-induced emission of dust.

[1] G. Sauermann, K. Kroy and H.J. Herrmann, Phys. Rev. E 64, 031305 (2001)