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[1] A scaling law is proposed to describe the force experienced by a wall-like obstacle overflowed by a granular avalanche-flow when a stagnant zone is formed upstream from the wall and co-exists with an inertial zone above without granular jump. It relates the force on the wall relative to the force due to the kinetic energy of the undisturbed incident flow to (i) the Froude number, (ii) the wall height relative to the flow thickness, (iii) the slope angle and (iv) the various parameters associated with the properties of the flowing granular material. The scaling law is compared to small-scale discrete numerical simulations in two dimensions and data from granular laboratory tests. Finally, we discuss on the applicability of the new model to the full-scale granular flows. Citation: Faug, T., P. Caccamo, and B. Chanut (2012), A scaling law for impact force of a granular avalanche flowing past a wall, Geophys.

This work describes small-scale laboratory tests on dry granular avalanches. Avalanches flow down a channel and impact a wall-like obstacle. A deposit generates upstream of the obstacle and plays an important role in the definition of the total mean force induced on the obstacle by the flow. The estimation of this force is crucial to design efficient protection structures against snow avalanches.