Elucidations of vertical structures of blowing snow with snowfall

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  • MASUZAWA Satoka
    Faculty of Science, Niigata University, Civil Engineering Research Institute for Cold Region, Public Works Research Institute,
  • OMIYA Satoshi
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute,
  • OKAZE Tsubasa
    School of Environment and Society, Tokyo Institute of Technology,
  • NIIYA Hirofumi
    Center for Transdisciplinary Research, Niigata University,

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Other Title
  • 降雪を伴う吹雪の鉛直構造の解明
  • コウセツ オ トモナウ フブキ ノ エンチョク コウゾウ ノ カイメイ

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Abstract

To elucidate vertical structures of blowing snow with the snowfall, we acquired blowing snow events, which reached equilibrium, from observational data of two months. Estimation of the snowfall frequency in each event was based on snow particle diameters that were greater than 400μm, which were assumed as snowfall particles in this study. Wind profiles were expressed as logarithmic functions of the height; additionally, the roughness length during high snowfall frequency was smaller than during low snowfall frequency at the equivalent friction velocity. The snow-drift flux during low snowfall frequency decreased with increasing height and exhibited uniform distribution at high snowfall frequency. Moreover, the friction velocity dependency of snow-drift flux was confirmed, but the variation was high during high snowfall frequency. The snow-drift flux of during snow particles with less than 200μm diameter decreased with increasing height, whereas that of snowfall particles was vertically uniform. Therefore, the change in the vertical distribution of the snow-drift flux influenced by snowfall frequency was quantitatively explained through the role of snowfall particles to the total snow-drift flux.

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