Surface flows of granular materials: a short introduction to some recent models

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Abstract
We present a short review of recent theoretical descriptions of flows occuring at the surface of granular piles, and focus mainly on two models: the phenomenological ``BCRE'' model and the hydrodynamic model, based on Saint-Venant equations. Both models distinguish a ``static phase'' and a ``rolling'' phase inside the granular packing and write coupled equations for the evolutions of the height of each of these phases, which prove similar in both approaches. The BCRE description provides a very intuitive picture of the flow, whereas the Saint-Venant hydrodynamic description establishes a general and rigorous framework for granular flow studies.Comment: 10 pages, 3 figures, published in a special issue of C. R. Physique (Paris) on granular matte