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DY: Fachverband Dynamik und Statistische Physik

DY 24: Pattern formation in colloidal and granular systems I

DY 24.2: Talk

Thursday, March 26, 2009, 15:00–15:15, ZEU 255

How attractive is a barchan dune? — •Christopher Groh¹, Ingo Rehberg¹, and Christof Kruelle^1,2 — ¹Experimentalphysik V, Universität Bayreuth, Germany — ²Maschinenbau und Mechatronik, Hochschule Karlsruhe - Technik und Wirtschaft, Germany

The spatio-temporal behaviour of barchan dunes is investigated experimentally with downsized longitudinal barchan dune slices generated in a narrow water flow tube. We observe a rapid transition to a steady-state solution with constant mass, shape, and velocity. The development towards this shape attractor is shown on the basis of four different starting configurations in qualitative observation and quantitative analysis.

[1]C. Groh, A.Wierschem, N. Aksel, I. Rehberg, and C. A. Kruelle (2008). Barchan dunes in two dimensions: Experimental tests for minimal models. Phys. Rev. E 78, 021304.

[2]C. Groh, I. Rehberg, and C. A. Kruelle (2008). How attractive is a barchan dune? New Journal of Physics, submitted.

[3]C. Groh, N. Aksel, I. Rehberg, and C. A. Kruelle (2008). Grain size dependence of barchan dune dynamics. http://arxiv.org/abs/0811.4729