Unchannelized collapse of wet granular columns in the pendular state: Dynamics and morphology scaling

Different regimes are observed in the unchannelized collapse of wet granular columns. The initial aspect ratio of the column and the dimensionless macroscopic cohesion, which contains the particle size and the water content, are two relevant variables in the formation of different regimes and in the collapse dynamics. Generalized scaling laws are developed to characterize the deposit of wet collapsing material for which morphological quantities may be conveniently expressed by adding variations caused by the cohesion effect to the results of dry granular material.