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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 2, issue 3/4
Nat. Hazards Earth Syst. Sci., 2, 129–136, 2002
https://doi.org/10.5194/nhess-2-129-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Landslides and related phenomena: Avalanches

Nat. Hazards Earth Syst. Sci., 2, 129–136, 2002
https://doi.org/10.5194/nhess-2-129-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  31 Dec 2002

31 Dec 2002

Effect of unsteady wind on drifting snow: first investigations

J.-L. Michaux1, F. Naaim-Bouvet1, M. Naaim1, M. Lehning2, and G. Guyomarc’h3 J.-L. Michaux et al.
  • 1CEMAGREF-ETNA, BP.76 Domaine Universitaire, F-38402 Saint Martin d’Hères, France
  • 2Swiss Federal Institute for Snow and Avalanche Research SLF, Flüelastr. 11, CH-7260 Davos, Switzerland
  • 3METEO-FRANCE, Centre d’Etudes de la Neige, 1441 rue de la piscine, F-38406 Saint Martin d’Hères Cedex, France

Abstract. Wind is not always a steady flow. It can oscillate, producing blasts. However, most of the current numerical models of drifting snow are constrained by one major assumption: forcing winds are steady and uniform. Moreover, very few studies have been done to verify this hypothesis, because of the lack of available instrumentation and measurement difficulties. Therefore, too little is known about the possible role of wind gust in drifting snow. In order to better understand the effect of unsteady winds, we have performed both experiments at the climatic wind tunnel at the CSTB (Centre Scientifique et Technique des Bâtiments) in Nantes, France, and in situ experiments on our experimental high-altitude site, at the Lac Blanc Pass. These experiments were carried out collaboratively with Cemagref (France), Météo-France, and the IFENA (Switzerland). Through the wind tunnel experiments, we found that drifting snow is in a state of permanent disequilibrium in the presence of fluctuating airflows. In addition, the in situ experiments show that the largest drifting snow episodes appear during periods of roughly constant strong wind, whereas a short but strong blast does not produce significant drifting snow. 

Key words. Drifting snow, blowing snow, gust, blast, acoustic sensor

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