THE OBSERVATION OF TYPHOON WINDS BY DOPPLER SODAR : Features of mean wind profile

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  • GOTO Satoru
    Technical Research Institute, Obayashi Co. Ltd.
  • AMANO Teruhisa
    Dept. of Civil Engineering and Architecture, Faculty of Engineering, Univ. of the Ryukyu
  • OHKUMA Takeshi
    Dept. of Architecture and Building Engineering, Faculty of Engineering, Kanagawa Univ.
  • KAWAGUCHI Akihisa
    Technical Research Institute, Obayashi Co. Ltd.

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  • ドップラーソーダによる台風時の上空風観測 : 平均風速の鉛直分布
  • ドップラーソーダ ニ ヨル タイフウジ ノ ジョウクウフウ カンソク ヘイキン

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Abstract

The wind structure in lower atmosphere associated with the wind resistant design of high-rise buildings has been investigated by Doppler sodar in Okinawa since 1994. The measurements are carried out in thirteen typhoons, among which four typhoons are selected to discuss mean wind profiles. The results of the observation show that the wind profile consists of two layers; the lower one to fit power law and the upper one with the constant velocity. The velocities in the upper layer coincide with the observed data by rawin sonde, and also with the theoretically estimated gradient wind. Furthermore, the bottom of the upper layer locates at comparatively lower altitude than the empirically known gradient height. It is emphasized that the layer of constant velocity equivalent to gradient wind possibly descends in extraordinary case to a height less than 100 meters in typhoon winds.

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