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Wind and Structures Volume 15, Number 1, January 2012 , pages 1-15 DOI: https://doi.org/10.12989/was.2012.15.1.001 |
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Wind characteristics of a strong typhoon in marine surface boundary layer |
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Lili Song, Q.S. Li, Wenchao Chen, Peng Qin, Haohui Huang and Y.C. He
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| Abstract | ||
| High-resolution wind data were acquired from a 100-m high offshore tower during the passage of Typhoon Hagupit in September, 2008. The meteorological tower was equipped with an ultrasonic anemometer and a number of cup anemometers at heights between 10 and 100 m. Wind characteristics of the strong typhoon, such as mean wind speed and wind direction, turbulence intensity, turbulence integral length scale, gust factor and power spectra of wind velocity, vertical profiles of mean wind speed were investigated in detail based on the wind data recorded during the strong typhoon. The measured results revealed that the wind characteristics in different stages during the typhoon varied remarkably. Through comparison with non-typhoon wind measurements, the phenomena of enhanced levels of turbulence intensity, gust factors, turbulence integral length scale and spectral magnitudes in typhoon boundary layer were observed. The monitored data and analysis results are expected to be useful for the wind-resistant design of offshore structures and buildings on seashores in typhoon-prone regions. | ||
| Key Words | ||
| strong typhoon; wind characteristic; wind data measurement. | ||
| Address | ||
| Lili Song : Guangzhou Institute of Tropical and Marine Meteorology, Guangzhou, 510080, China Q.S. Li : Department of Building and Construction, City University of Hong Kong, Hong Kong Wenchao Chen , Peng Qin and Haohui Huang : Guangdong Climate Centre, Guangzhou, 510080, China Y.C. He : Department of Building and Construction, City University of Hong Kong, Hong Kong | ||