Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 18: Granular matter / contact dynamics

DY 18.3: Vortrag

Mittwoch, 25. März 2009, 16:45–17:00, HÜL 386

Theoretical Model of Avalanche Motion — •Birte Domnik, Christian Kröner, and Shiva P. Pudasaini — Steinmann Institut,Universität Bonn, Germany

A continuum model for rapid motion of granular material is presented, which provides both the geometry (height) and the velocity field of the granular flow. The knowledge of the motion and rheology of granular materials is needed in the area of snow avalanche hazard research in order to determine the regions at risk and the impact power of avalanches on defense structures. First a depth-integrated model [1] based on the Savage-Hutter model is presented, which is useful in regions where the flow is almost plane and vertical momentum transfer can be neglected. The main challenge in modelling a complete three dimensional flow is to find an appropriate description of the stresses in the material. Therefore, different stress models are implemented into a not depth-integrated flow model. To reduce the computing time the not depth-integrated and the depth integrated model will be coupled. [1] S. P. Pudasaini, Avalanche Dynamics, Springer-Verlag,Berlin, 2007