Articles | Volume 15, issue 6
https://doi.org/10.5194/nhess-15-1275-2015
https://doi.org/10.5194/nhess-15-1275-2015
Research article
 | 
18 Jun 2015
Research article |  | 18 Jun 2015

Forest damage and snow avalanche flow regime

T. Feistl, P. Bebi, M. Christen, S. Margreth, L. Diefenbach, and P. Bartelt

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Cited articles

Baroudi, D., Sovilla, B., and Thibert, E.: Effects of flow regime and sensor geometry on snow avalanche impact-pressure measurements, J. Glaciol., 57, 277–288, 2011.
Bartelt, P. and Stöckli, V.: The influence of tree and branch fracture, overturning and debris on snow avalanche flow, Ann. Glaciol., 32, 209–216, 2001.
Bartelt, P., Feistl, T., Bühler, Y., and Buser, O.: Overcoming the stauchwall: Viscoelastic stress redistribution and the start of full-depth gliding snow avalanches, Geophys. Res. Lett., 39, L16501, https://doi.org/10.1029/2012GL052479, 2012a.
Bartelt, P., Glover, J., Feistl, T., Bühler, Y., and Buser, O.: Formation of levees and en-echelon shear planes during snow avalanche run-out, J. Glaciol., 58, 980–992, 2012b.
Bartelt, P., Buser, O., Bühler, Y., Dreier, L., and Christen, M.: Numerical simulation of snow avalanches: Modelling dilatative processes with cohesion in rapid granular shear flows, in: Numerical Methods in Geotechnical Engineering – Proceedings of the 8th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE, 327–332, 2014.
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Snow avalanches break, uproot and overturn trees, causing damage to forests. In this paper, we define avalanche loading cases representing four different avalanche flow regimes: powder, intermittent, dry and wet. Using a numerical model that simulates both powder and wet snow avalanches, we study documented events with forest damage. We find that powder clouds with velocities over 20m/s break tree stems and that quasi-static pressures of wet snow avalanches are much higher than dynamic pressure.
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