Characteristics of mean wind and turbulence profiles of typhoon wind

K. T. Tse, A. U. Weerasuriya, S. W. Li, P. W. Chan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Mean wind speed and turbulence are two main characteristics to describe conventional wind flow. Both these characteristics in an extreme wind event such as a typhoon is not well understood up to date. Hong Kong is a better place to investigate wind characteristics of typhoons as there are several typhoons pass through the country in every year. The Doppler SODARs and wind-profilers installed by Hong Kong Observatory are used to obtained measurements on both mean wind velocities and turbulence intensities up to 500 m height during two typhoons. The derived wind speed profiles are compared with widely used log-law and power-law wind profiles. The comparison showed that both the log-law and the power-law models successfully describe the vertical variation of mean wind velocities, especially for lower altitudes. The measured turbulence intensity profile is compared with both ESDU and AIJ turbulence profile models for non- typhoon wind. None of the ESDU or AIJ model could predict the real turbulence intensity profile accurately. The better prediction by AIJ model on the shape of vertical variation of the turbulence intensity indicates there is no appreciable difference in turbulence variation in typhoon boundary layer and conventional atmospheric boundary layer .

Original languageEnglish
Title of host publicationProceedings of the 8th Asia-Pacific Conference on Wind Engineering, APCWE 2013
EditorsNagesh R. Iyer, Prem Krishna, Rajan S. Selvi, P. Harikrishna
Pages740-747
Number of pages8
ISBN (Electronic)9789810780111
DOIs
Publication statusPublished - 2013
Externally publishedYes
Event8th Asia-Pacific Conference on Wind Engineering, APCWE 2013 - Chennai, India
Duration: 10 Dec 201314 Dec 2013

Publication series

NameProceedings of the 8th Asia-Pacific Conference on Wind Engineering, APCWE 2013

Conference

Conference8th Asia-Pacific Conference on Wind Engineering, APCWE 2013
Country/TerritoryIndia
CityChennai
Period10/12/1314/12/13

Keywords

  • Field observations
  • Mean wind profile
  • Turbulence intensity profile
  • Typhoon wind characteristics

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