Multiphase simulations and experiments of subaqueous granular collapse on an inclined plane in densely packed conditions: Effects of particle size and initial concentration

Subaqueous granular collapse on an inclined plane was investigated numerically in densely packed conditions by using a multiphase model. A new set of laboratory experiments were performed to validate the multiphase model with four different particle sizes (from fine sand to very coarse sand). The simulated results reveal that both the volume of the sliding mass in the early stages (initial sliding volume) and the front speed increase with increasing particle size. Additionally, increasing the initial concentration reduces the initial sliding volume and front speed.