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DY: Fachverband Dynamik und Statistische Physik

DY 19: Granular matter I

DY 19.3: Vortrag

Mittwoch, 27. Februar 2008, 15:00–15:15, MA 004

2D barchan dunes made in the lab — •Christopher Groh¹, Andreas Wierschem², Nuri Aksel², Ingo Rehberg¹, and Christof Krülle¹ — ¹Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth, Germany — ²Technische Mechanik und Strömungsmechanik, Universität Bayreuth, D-95440 Bayreuth, Germany

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 field studies, 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.

In our setup we are able to investigate a well defined two-dimensional single barchan dune under the force of a shearing water flow. Thus we have a basic access to the dynamic of a barchan dune. This allows easily the validation of the existing two-dimensional theoretical models with our experimental data.