Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-217
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Brief communication
07 Jul 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Brief Communication: Dynamic magnification factors for tree blow-down by powder snow avalanche air blasts
Perry Bartelt1, Peter Bebi1, Thomas Feistl2, Othmar Buser2, and Caviezel Andrin1 1WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse 11, 7260 Davos Dorf, Switzerland
2Lawinenwarnzentrale im bayerischen Landesamt für Umwelt, Hessstrasse 128, 80797, Munich, Germany
Abstract. We study how short duration powder avalanche blasts can break and overturn tall 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 overturning. Dynamic magnification factors for bending and overturning failures should therefore be considered when back-calculating avalanche impact pressures.

Citation: Bartelt, P., Bebi, P., Feistl, T., Buser, O., and Andrin, C.: Brief Communication: Dynamic magnification factors for tree blow-down by powder snow avalanche air blasts, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-217, in review, 2017.
Perry Bartelt et al.
Perry Bartelt et al.
Perry Bartelt et al.

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My research group is working on the problem of the destructive force of powder avalanche wind blasts. Recent ice avalanches in Nepal (Langtang and Everest) revealed that the wind blast alone caused much damage and many fatatlities. There are many examples of wind blasts knocking down forests, and this information could be used to constrain the Problem, if we understood the interaction between the blast and the tree. Here we show that dynamic magnification factors are necessary.
My research group is working on the problem of the destructive force of powder avalanche wind...
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