Dynamic magnification factors for tree blow-down by powder snow avalanche air blasts

Dynamic magnification factors for tree blow-down by powder snow avalanche air blasts

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We study how short duration powder avalanche blasts can break and overturn tall 750 ML trees.Tree blow-down is often used to back-calculate avalanche pressure and therefore constrain avalanche flow velocity and motion.We find that tall trees are susceptible to avalanche air blasts because the duration of the air blast is near to the period of vibration of tall trees, both in bending and root-plate Air Filters overturning.Dynamic magnification factors for bending and overturning failures should therefore be considered when back-calculating avalanche impact pressures.