Effects of deflector orientation on dry granular overflow

Abstract

© ASCE. One of the critical design scenarios for debris-resisting structures against geophysical flows is being able to predict the overflow velocity if the retention volume is compromised. Complex barrier geometries, especially vertical barriers equipped with deflectors on an inclined slope, can alter the overflow velocity. However, there are no scientific guidelines on how to select an ideal deflector geometry to minimize the overflow velocity. Flume tests were carried out to study the interaction between dry granular flow and rigid barrier deflectors of varying angles. The physical tests were then used to calibrate a Discrete Element Model (DEM). The DEM was then used to carry out a parametric study considering the influence of channel inclination and deflector orientation on overflow velocity. In this paper, the flume and discrete element modelling techniques are described and preliminary results are discussed.