Dissipative discrete element model applied to rock avalanches

In order to improve the numerical modelling of rock avalanches and to provide information concerning the physical phenomena underlying this type of granular flow, a discrete element model is used to investigate the collective behaviour of granular masses propagating down a slope. The numerical model aims at improving the understanding of rock avalanches by providing both valuable information about the shape of the granular deposit, and relevant data about the kinematics of the flow. The simulations consist in the launch, fall, and deposition of a granular mass constituted of small bricks, along a planar slope having a sharp change of gradient. Sizes and shapes of the particles are investigated in order to assess their influences on the kinematics of the flow and on the dimensions and shape of the granular deposit.