The relation between instantaneous visibility and average visibility during blowing snow

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  • MATSUZAWA Masaru
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute,
  • OMIYA Satoshi
    Civil Engineering Research Institute for Cold Region, Public Works Research Institute,

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  • 吹雪時の平均視程と瞬間視程の関係
  • フブキジ ノ ヘイキン シテイ ト シュンカン シテイ ノ カンケイ

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The authors provide information on visibility prediction of blowing snow on the internet. In this system, the average visibility value per hour is estimated based on the hourly wind speed, temperature, and precipitation intensity provided by the Japan Meteorological Agency. However, because the fluctuations of a blowing snow are intense, there is a large difference between the average visibility and the instantaneous visibility. Therefore, understanding the difference is important when a driver is to make a decision related to traffic behavior. In this study, the authors investigated the relation between average visibility and instantaneous visibility. First, the mass flux of snow is measured using an SPC (Snow Particle Counter), and the resultant values were converted into visibility data. Using the data, the author analyzed the relationship between hourly average visibility Vh and instantaneous visibility Vi, and found that the maximum value of instantaneous visibility is about 30 times Vh, and the minimum value is about 0.2 times Vh. In addition, the visibility fluctuation rate F, defined as the ratio of the standard deviation σ of logVi to the hourly average value of logVi, was 12-15 %.

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