Stretched exponentials and power laws in granular avalanching

Abstract

We introduce a model for granular avalanching which exhibits both stretched exponential and power law avalanching over its parameter range. Two modes of transport are incorporated, a rolling layer consisting of individual particles and the overdamped, sliding motion of particle clusters. The crossover in behaviour observed in experiments on piles of rice is attributed to a change in the dominant mode of transport. We predict that power law avalanching will be observed whenever surface flow is dominated by clustered motion.

8 pages, more concise and some points clarified. To appear in J. Phys. A

References in corpus (1)

• Jamming, Force Chains and Fragile Matter

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