couche super-fragile

OBS: couche mince: couche de neige de faible épaisseur, en général de faible cohésion et constituée de neige roulée, de givre, de gobelets ou de faces planes.

CONT: A widely accepted theory of slab avalanche formation assumes the existence of ""super-weak"" layers. Because a weak layer cannot effectively transmit the shear forces from the overburden snow, stress and strain-rate concentrations at the ends of the weak layer are generated. Fracture initiates at the higher end when the strain-rate concentration exceeds a critical value.