Estimation of directional basic wind speed by GIS-based typhoon simulation system

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  • AMANO Takafumi
    (株) 綜合技術コンサルタント 大阪支社 技術I部 開発課
  • AKETA Osamu
    (株) 綜合技術コンサルタント 大阪支社 技術I部
  • SUZUKI Takeshi
    阪神高速道路 (株) 保全施設部 保全管理グループ

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  • GISを用いた台風シミュレーション・システムによる風向別風速の再現期待値の推定
  • GIS オ モチイタ タイフウ シミュレーション システム ニ ヨル フウコウベツ フウソク ノ サイゲン キタイチ ノ スイテイ

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In this research, the basic wind speed for a long-span bridge was estimated using GIS-based typhoon simulation system. The probability distributions of the annual maximum wind speeds were computed for every 16-divided wind direction by the Monte-Carlo method. The method uses probabilistic models expressing the characteristics of the typhoons which were created from the recorded typhoons by the Japan Meteorological Agency, and it also uses the Meng's formula which estimates surface wind speed at the proposed bridge site. Various analyses were efficiently performed making the best use of the functions of GIS. As a result, the maximum wind speed with a return period of 100 years was estimated to be 35m/s (south-southwest direction). Furthermore, the characteristics of the typhoons which caused extremely strong wind speed at the site were considered.

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