Triangular avalanches and uphill instabilities

Details Triangular avalanches and uphill instabilities Triangular avalanches and uphill instabilities

1998-01-14

arxiv.org/abs/cond-mat/9801132v1

Physics

Condensed Matter

Soft Condensed Matter

submitted to `Granular Matter'

Scientific paper

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$^o$ for a critical inclination of the pile, beyond which avalanches also propage upwards. We propose a simple interpretation of these observations, based on an extension of a phenomenological model for surface flows.

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