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2002 Fiscal Year Final Research Report Summary

Estimates of gust wind speeds in Kyushu area for a wind hazard map

Research Project

Project/Area Number 12450227
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Building structures/materials
Research InstitutionKyushu University

Principal Investigator

MAEDA Junji  Kyushu University, Graduate School of Human-Environmental Studies, Professor, 大学院・人間環境学研究院, 教授 (40128088)

Co-Investigator(Kenkyū-buntansha) TOMOKIYO Eriko  Kyushu University, Graduate School of Human-Environmental Studies, Research Assistant, 大学院・人間環境学研究院, 助手 (30346829)
Project Period (FY) 2000 – 2002
Keywordsgust factor / wind disaster / local wind of terrain / NeWMeK / damage rate of houses / map of maximum wind speed / duration of strong wind
Research Abstract

(1) The properties of the gust factors of mean wind speed of over 15 m/s were investigated based on the data of the network of wind measurement in Kyushu (NeWMeK) from 1994 to 2002, which has 122 measurement stations, and the digital information of each terrain. The data of each station are arranged by typhoon or non-typhoon, 16 directions of wind, its weather condition and its topography of terrain.
(2) It is indicated that the gust factors in typhoon are higher than those in non-typhoon: 1.9 in typhoon and 1.7 in non-typhoon. When typhoon approaches, the gust factor does not decrease even though the mean wind speeds are high. And so a maximum gust speed is estimated to be a much higher wind speed. Moreover, the maximum gust is much higher in southern wind than in northern wind.
(3) The property of increase of wind speed at Shiranui-cho of Kumamoto prefecture was investigated by wind tunnel test. It is found that the temperature gradient of the approaching wind profile affects strongly the increase of wind in the lower layer. The stability of a stratified wind flow is enhanced by a cooled plate using a dry-ice box located at the wind tunnel surface. However, it is difficult to estimate the local wind speed in a mixed area such as a deep river and a deep valley floor.
(4) Most of the investigation of the relationship between residential damage rates and wind speeds based on information of damaged residential houses by Typhoon Bart(1999) indicate clearer relation to a instantaneous wind speed. For wind speeds of exceeding 30 m/s, the damage rate exponentially increases. In addition, the duration of wind affects strongly the damage rates in case of wind speeds of over 35 m/s.
(5) We have produced the instantaneous maximum wind speed map of Kyushu, by combining our information of gust factors and the map of expected wind speeds for a return period of a hundred years. This wind speed map is applicable to suggest a wind hazard map of residential houses and buildings.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] E.Tomokiyo, J.Maeda: "Typhoon Damage Analysis of Transmission Towers in Japan"Proceedings of 11th International Conference on Wind Engineering. (In press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田潤滋, 友清衣利子, et al.: "強風時における九州地区での風向別突風率特性"第17回風工学シンポジウム論文集. 17. 19-24 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Fujii, J.Maeda, et al.: "An Analysis of a Pressure Pattern in Severe Typhoon Bart Hitting the Japanese Islands in 1999 and a Comparison of the Gradient Wind with the Observed Surface Wind"Journal of Wind Engineering and Industrial Aerodynamics. 90. 1555-1568 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kajitani, Y.Imamura, et al.: "Application of NeWMeK to Wind Distribution Analysis on Locations near Transmission Towers Collapsed by Strong Winds"The 14th Conference of the Electric Power Supply Industry. 2. 241-246 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石田伸幸 et al.: "福岡市西部地区での強風特性の及ぼす局所地形の影響"第16回風工学シンポジウム論文集. 16. 7-12 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田潤滋 et al.: "九州地区における台風9918号の強風特性に関する二、三の考察-NeWMeKによる強風分布情報と風倒木分布に見るマクロ地形の影響-"第16回風工学シンポジウム論文集. 16. 95-100 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eriko Tomokiyo, et al.: "Characteristics of Gust Factors according to Every Wind Direction-On the basis of NewMeK data in non-typhoon"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 41-1. 217-220 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Eriko Tomokiyo, et al.: "Wind Tunnel Study for Wind Speed-up Characteristics in Strong Winds at Matsuai-area of Shiranui in Kumamoto"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 40-1. 249-252 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takahiro Kusumoto, et al.: "Strong Wind Distribution in West of Fukuoka by Wind Tunnel Test-Wind Directional Characteristics at Imajuku"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 39-1. 229-232 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] E. Tomokiyo, J. Maeda: "Typhoon Damage Analysis of Transmission Towers in Japan"Proceedings of 11th International Conference on Wind Engineering. in press. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] J. Maeda, E. Tomokiyo: "Kyushu' s Gust Factors According to Wind Directions in Strong Winds"Proceedings of 17th National Symposium on Wind Engineering. 19-24 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Kajitani, Y. Imamura, J. Maeda, et al.: "Application of NeWMeK to Wind Distribution Analysis on Locations near Transmission Towers Collapsed by Strong Winds"The 14th Conference of the Electric Power Supply Industry. Vol.2. 241-246 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Fujii, et al.: "An Analysis of a Pressure Pattern in Severe Typhoon Bart Hitting the Japanese Islands in 1999 and a Comparison of the Gradient Wind with the Observed Surface Wind"Journal of Wind Engineering and Industrial Aerodynamics. 90. 1555-1568 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eriko Tomokiyo, et al.: "Characteristics of Gust Factors according to Every Wind Direction - On the basis of NewMeK data in non-typhoon"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 41-1. 217-220 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Eriko Toraokiyo, et al.: "Wind Tunnel Study for Wind Speed-up Characteristics in Strong Winds at Matsuai-area of Shiranui in Kumamoto"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 40-1. 249-252 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nobuyuki Ishida, et al.: "Some Effects of Topographical Features on Strong Wind Characteristics of the Western Area of Fukuoka City"16th National Symposium on Wind Engineering. 7-12 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Junji Maeda, et al.: "Wind Characteristics of Typhoon Bart(T9918) based on Some Observations"16th National Symposium on Wind Engineering. 95-100 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takahiro Kusumoto, et al.: "Strong Wind Distribution in West of Fukuoka by Wind Tunnel Test - Wind Ddirectional Characteristics at Imajuku"AIJ Kyushu Chapter Architectural Research Meeting (Structure). 39-1. 229-232 (2000)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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