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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 3 | Copyright
Nat. Hazards Earth Syst. Sci., 18, 759-764, 2018
https://doi.org/10.5194/nhess-18-759-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 Mar 2018

07 Mar 2018

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

Perry Bartelt1, Peter Bebi1, Thomas Feistl2, Othmar Buser2, and Andrin Caviezel1 Perry Bartelt et al.
  • 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.

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We study how short duration powder avalanche blasts 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. Dynamic magnification factors should therefore be considered when back-calculating powder avalanche impact pressures.
We study how short duration powder avalanche blasts break and overturn tall trees. Tree...
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