Triangular and uphill avalanches of a tilted sandpile |
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| Authors: | J.P. Bouchaud M. E. Cates |
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| Affiliation: | Service de Physique de lEtat Condensé, CEA, Ormes des Merisiers, 91191 Gif-sur-Yvette, Cedex France e-mail: bouchau@amoco.saclay.cea.fr, FR
University of Edinburgh, JCMB Kings Buildings, Mayfield Road, Edinburgh EH9 3JZ, UK, GB
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| Abstract: | Recent experiments show that an avalanche initiated from a point source propagates downwards by invading a triangular shaped region. The opening angle of this triangle appears to reach 180° for a critical inclination of the pile, beyond which avalanches also propagate upwards. We propose a simple interpretation of these observations, based on an extension of a phenomenological model for surface flows. |
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