ABSTRACT
Modeling of debris flow is very challenging due to the presence of multiphase heterogeneous materials and their complex interactions. For debris flows occurring in a hilly terrain, the width of the flow channel (or gully) and the aspect ratio of the dislodged mass significantly influences the final run-out distance and velocity profile of the flowing debris. In this regard, granular column collapse studies present a simplistic approach to comprehend the intricacies of such flows. In the present study, a 3-D Discrete Element Method (DEM) based simulation of dry granular column collapse has been carried out emphasizing the effect of initial aspect ratio of collapsing mass and channel width. Additionally, the influence of side wall friction of the channel on the depositional morphology of the flowing mass has been investigated.
