吹雪時の視程推定手法の改良に関する研究 Improving visibility estimation under snowstorm

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著者

    • 松澤 勝 MATSUZAWA Masaru
    • 独立行政法人土木研究所寒地土木研究所寒地道路研究グループ雪氷チーム Snow and Ice Research Team, Civil Engineering Research Institute for Cold Region, Public Works Research Institute

抄録

本研究では,気象条件から簡易に吹雪時の視程を推定する松沢・竹内(2002)の視程推定手法の改良を試みた.吹雪時に野外で,降雪強度,風速及び飛雪流量観測を行い,風速と飛雪空間密度の関係式,および風速と摩擦速度の関係式を求めた.両式を,松沢・竹内(2002)の視程推定手法に適用し,石狩吹雪実験場で観測した気象データ等を用いて,視程を推定した.視程の実測値と推定値をそれぞれ5ランクに分け,両者が一致した場合を適中と定義し,適中率(全データ数に対する適中数の割合)を求めた.1時間毎のデータで視程を推定した結果,適中率が36%から50%に向上し,視程推定手法の改良の効果が確認出来た.

This paper proposes an improved method for estimating visibility under snowstorm. The method extends that developed by Matsuzawa and Takeuchi (2002), by incorporating additional weather data. Snowfall intensity, wind velocity, and mass flux of snow were measured under snowstorm, and equations describing the relationship between wind velocity and snow concentration, and that between wind velocity and friction velocity were obtained. The equations were incorporated into the visibility estimation method of Matsuzawa and Takeuchi (2002). Visibility was estimated using weather data obtained by field surveys conducted at the Ishikari Blowing-Snow Test Field. Measured and estimated visibility were each divided into five categories. A correct estimation was defined as agreement between estimated and measured visibility categories. The perfectly percent correct, which is a percentage of the number of correct estimations to the number of all estimations, was calculated for the hourly visibility observation data. The improvements raised the perfectly percent correct to 50% from 36%.

収録刊行物

  • 雪氷  

    雪氷 69(1), 79-92, 2007-01-15 

    The Japanese Society of Snow and Ice

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キーワード

各種コード

  • NII論文ID(NAID)
    10018547712
  • NII書誌ID(NCID)
    AN00131221
  • 本文言語コード
    JPN
  • 資料種別
    NOT
  • ISSN
    03731006
  • NDL 記事登録ID
    8676342
  • NDL 雑誌分類
    ZM43(科学技術--地球科学--気象)
  • NDL 請求記号
    Z15-23
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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