Journal of the Japanese Society of Snow and Ice
Online ISSN : 1883-6267
Print ISSN : 0373-1006
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Volume 53, Issue 4
Displaying 1-4 of 4 articles from this issue
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  • Mean trajectory of the snow cloud as estimated from the distribution of the spatial correlation of snowfall rate in Aomori Prefecture
    Kunio RIKIISHI, Kenji OHNISHI
    1991 Volume 53 Issue 4 Pages 281-289
    Published: December 30, 1991
    Released on J-STAGE: August 07, 2009
    DOIhttps://doi.org/10.5331/seppyo.53.281
    JOURNAL FREE ACCESS
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    The spatial correlation of snowfall rate has been studied in relation to the mean trajectory of the snow cloud. From the analysis of hourly data of the snow depth at 11 stations in Aomori City for the period of December 1987 through March 1988, it is found that the high correlation zone lies along the mean wind direction. This suggests that the high correlation zone indicates the mean trajectory of sonw cloud which may correspond to the mean wind direction in the upper air of 1-1.5 km above the surface. Daily data of the snow depth at 127 stations in Aomori Prefecture for the period of January 1979 through February 1985 have been analyzed in order to estimate the mean trajectory of snow cloud. It is found that the snow clouds are generally transported by the west winds of winter monsoon in a wide area of Aomori Prefecture. However, the trajectories make a detour around Mt. Hakkoda in the neighborhood of Aomori City, and the trajectories in the northern part of Tsugaru Peninsula suggest that northwest winds prevail there owing to the orographic effect. The above trajectories correspond well with the mean wind directions observed at the surface meteorological stations. In the southern part of the Tsugaru Plain, on the other hand, the estimated trajectories imply that the snow clouds are most effectively transported by northwest winds.
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  • The state of snow depth and snow damages of young Cryptomeria japonica stands in two-storied forest
    Masahiro MATSUDA
    1991 Volume 53 Issue 4 Pages 291-295
    Published: December 30, 1991
    Released on J-STAGE: February 05, 2010
    DOIhttps://doi.org/10.5331/seppyo.53.291
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • A hydraulic approach to a snow removal system in an open channel
    Yusuke FUKUSHIMA, Kazuyoshi YOSHINAGA, Norio HAYAKAWA, Koichi OKAMURA
    1991 Volume 53 Issue 4 Pages 297-307
    Published: December 30, 1991
    Released on J-STAGE: August 07, 2009
    DOIhttps://doi.org/10.5331/seppyo.53.297
    JOURNAL FREE ACCESS
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    The snow removal system in an open channel is investigated by the hydraulic approach. The fundamental equations are derived by treatment of the two-phase flow analysis. The continuity and momentum equations are obtained for the snow and water phases. The increment in shear stresses caused by the snow movement is taken into account in the model. The shear stresses acting on the small water tunnel in the snow layer are considered. This idea is essential to developing this theoretical analysis. The results obtained show the threshold condition of snow movement, the increment ratio of water depth caused by the snow lump, and the maximum snow conveyance rate in an open channel. Some of these results are compared with experimental data and the agreement between the theory and experimental data are quite satisfying.
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  • Motions and vertical profiles of blowing snow particles
    Masao TAKEUCHI, Masaru MATSUZAWA
    1991 Volume 53 Issue 4 Pages 309-315
    Published: December 30, 1991
    Released on J-STAGE: August 07, 2009
    DOIhttps://doi.org/10.5331/seppyo.53.309
    JOURNAL FREE ACCESS
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