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| Titel |
Effect of unsteady wind on drifting snow: first investigations |
| VerfasserIn |
J.-L. Michaux, F. Naaim-Bouvet, M. Naaim, M. Lehning, G. Guyomarc'h |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 2, no. 3/4 ; Nr. 2, no. 3/4, S.129-136 |
| Datensatznummer |
250000272
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| Publikation (Nr.) |
 copernicus.org/nhess-2-129-2002.pdf |
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| Zusammenfassung |
| 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 B-timents) 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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