Regensburg 2007 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.51: Poster
Donnerstag, 29. März 2007, 16:00–18:00, Poster D
2d barchan dunes made in the lab — •Christopher Groh1, Christof Krülle1, Andreas Wierschem2, Nuri Aksel2, and Ingo Rehberg1 — 1Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth — 2Technische Mechanik und Strömungsmechanik, Universität Bayreuth, D-95440 Bayreuth
For a long time people are fascinated by the dynamics of sand dunes. And so it is not surprising that there are a lot of studies outdoors, which give an overview about the facts of the formation of dunes in the desert or at the beach. In recent years scientists looked for theoretical models to give answers to the basic questions of the physical mechanisms of dune formation and migration [1,2]. In our setup we are able to investigate the dynamics of a well defined two-dimensional single barchan dune under the force of a shearing water flow. This allows easily the validation of the existing two-dimensional theoretical models with our experimental data. Beyond that, several unexpected new features have been observed.
[1] B. Andreotti, P. Claudin, and S. Douady, Eur. Phys. J. B 28, 341-352 (2002)
[2] K. Kroy, G. Sauermann and H. J. Herrmann Phys. Rev. E 66, 031302 (2002)