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Validation of an application for forecasting blowing snow

  • Gilbert Guyomarc’h (a1) and Laurent Mérindol (a1)
Abstract

Wind effects on snow distribution and increasing avalanche hazard are well known. Forecasting such phenomena is based on empirical rules and experience. For two years, the CEN has tested a new analysis program for forecasting blowing-snow events at an Alpine site. The aim is to improve avalanche-forecasting tools so as to increase the accuracy of avalanche-hazard forecasts. Our understanding of blowing-snow mechanisms began with observations and field measurements at a high altitude site during periods of strong wind. Using an empirical approach, snow-grain morphology, cohesion between snow particles and grain-size have been combined to define a function for the calculation of a “driftabilily index”. By comparing this index with the wind thresholds observed in field, a snowdrifting index has been defined. Snow profiles calculated by SAFRAN (estimation of relevant meteorological parameters for snow models) and Crocus (snowpack-evolution model) were analysed using an application called PROTÉON. Forecasts of wind velocity and snow profiles have been used to discriminate between periods with or without snow transport. For the subsequent 24 hours and for each snow layer, the value of this snowdrifting index is calculated and displayed on a graph. Validation consists of a comparison of forecasted blowing-snow periods with the field observations and measurements at a pass situated at 2700 m a.s.l. Meteorological and snow-parameter data are available at this site.

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References
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Brun, E., David, P. Sudul, M. and Brunot., G. 1992. A numerical model to simulate snow-cover stratigraphy for operational avalanche forecasting. J. Glaciol., 38(128), 1322.
Castelle, T. 1995: Transport de la neige par le vent en montagne: approche expérimentale du site du Col du Lac Blanc. (Thèse de doctorat, École Polytechnique Fédérale de Lausanne.)
Colbeck, S. C. and 7 others. 1990. The international classification for seasonal snow on the ground. Wallingford, Oxon, International Association of Scientific Hydrology. International Commission on Snow and Ice.
Durand, Y., Brun., E. Mérindol, L. Guyomarc’h, G. Lesaffre, B. and Martin., E, 1993. A meteorological estimation of relevant parameters for snow models, Ann. Glaciol., 18,6571.
Föhn, P. M. B. 1980. Snow transport over mountain crests, J. Glaciol., 26(94), 469480.
Giraud, G., Brun, E. Durand, Y. and Martin., E. 1994. Validation of objective models to simulate snow cover stratigraphy and avalanche risks. In ISSW’94. International Snow Science Workshop, 30 October - 3 November 1994, Snowbird, Utah. Proceedings. Snowbird, UT, P.O. Box 49, 509517.
Guyomarc’h., G. and Castelle., T. 1993. A study of wind drift phenomena on an alpine site. In Armstrong, R., ed. ISSW’92. A Merging of Theory and Practice. International Snow Science Warkshop, 4–8 October 1992, Breckenridge, Colorado. Proceedings. Denver, CO, Avalanche Information Center, 5767.
Guyomarc’h., G. and Mérindol., L. 1995. PROTEON - Vers une prévision locale du transport de neige parlevent In Sivardière., F., ed. Les apports de la recherche scientifique à sécurité neige. glace et avalanche. Actes de Colloque, Chamonix 30 mai - 3 juin 1995. Grenoble, Association Nationale pour l–Étude de la Neige et des Avalanches (ANENA), 97102.
Guyomarc’h., G. Mérindol, L. and Sudul., M. 1997. Test of a multiplex snow depth sensor along a slope. In ISSW’96. International Snow Science Workshop, 6–10 October 1996, Banff, Alberta. Proceedings. Revelstoke, B.C., Canadian Avalanche Association, 173178.
Meister, R. 1989. Influence of strong winds on snow distribution and avalanche activity. Ann. Glaciol., 13, 195201.
Pomeroy, J.W. 1989. A process-based model of snow drifting Ann. Glaciol., 13, 237240.
Schmidt, R. A. 1981. Estimates of threshold windspeed from particle sizes in blowing snow. Cold Reg. Sci. Technol., 4(3), 187193.
Takeuchi, M. 1980. Vertical profile and horizontal increase of drift-snow transport. J. Glaciol., 26(94), 481492.
Takeuchi, M., Ishimoto, K. and Kajiya., Y. 1990. Blowing snow problems and their countermeasures in Hokkaido, Japan. In Eighth PIARC International Winter Road Congress. Proceeding. Vol. II. Sapporo, Japan, Hokkaido Development Bureau. Civil Engineering Research Institute, 249261.
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Annals of Glaciology
  • ISSN: 0260-3055
  • EISSN: 1727-5644
  • URL: /core/journals/annals-of-glaciology
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