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Wind and Structures Volume 30, Number 6, June 2020 , pages 575-595 DOI: https://doi.org/10.12989/was.2020.30.6.575 |
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Observational study of wind characteristics from 356-meter-high Shenzhen Meteorological Tower during a severe typhoon |
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Yinghou He, Qiusheng Li, Pakwai Chan, Li Zhang, Honglong Yang and Lei Li
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| Abstract | ||
| The characteristics of winds associated with tropical cyclones are of great significance in many engineering fields. This paper presents an investigation of wind characteristics over a coastal urban terrain based on field measurements collected from multiple cup anemometers and ultrasonic anemometers equipped at 13 height levels on a 356-m-high meteorological tower in Shenzhen during severe Typhoon Hato. Several wind quantities, including wind spectrum, gust factor, turbulence intensity and length scale as well as wind profile, are presented and discussed. Specifically, the probability distributions of fluctuating wind speeds are analyzed in connection with the normal distribution and the generalized extreme value distribution. The von Karman spectral model is found to be suitable to depict the energy distributions of three-dimensionally fluctuating winds. Gust factors, turbulence intensity and length scale are determined and discussed. Moreover, this paper presents the wind profiles measured during the typhoon, and a comparative study of the vertical distribution of wind speeds from the field measurements and existing empirical models is performed. The influences of the topography features and wind speeds on the wind profiles were investigated based on the field-measured wind records. In general, the empirical models can provide reasonable predictions for the measured wind speed profiles over a typical coastal urban area during a severe typhoon. | ||
| Key Words | ||
| field measurement; wind characteristics; typhoon; meteorological tower | ||
| Address | ||
| Yinghou He, Qiusheng Li:Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong/ Architecture and Civil Engineering Research Center, Shenzhen Research Institute of City University of Hong Kong, Shenzhen, China Pakwai Chan:Hong Kong Observatory, Kowloon, Hong Kong Li Zhang, Honglong Yang and Lei Li:Shenzhen National Climate Observatory, Shenzhen, China | ||