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Wind and Structures Volume 17, Number 2, August 2013 , pages 135-162 DOI: https://doi.org/10.12989/was.2013.17.2.135 |
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Characterization of open and suburban boundary layer wind turbulence in 2008 Hurricane Ike |
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S. Jung and F.J. Masters
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| Abstract | ||
| The majority of experiments to characterize the turbulence in the surface layer have been performed in flat, open expanses. In order to characterize the turbulence in built-up terrain, two mobile towers were deployed during Hurricane Ike (2008) in close proximity, but downwind of different terrain conditions: suburban and open. Due to the significant non-stationarity of the data primarily caused by changes in wind direction, empirical mode decomposition was employed to de-trend the signal. Analysis of the data showed that the along-wind mean turbulence intensity of the suburban terrain was 37% higher than that of the open terrain. For the mean vertical turbulence intensity, the increase for the suburban terrain was as high as 74%, which may have important implications in structural engineering. The gust factor of the suburban terrain was also 16% higher than that of the open terrain. Compared to non-hurricane spectral models, the obtained spectra showed significantly higher energy in low frequencies especially for the open terrain. | ||
| Key Words | ||
| hurricane; suburban; turbulence intensities; gust factors; integral scales; power spectra | ||
| Address | ||
| S. Jung : Department of Civil and Environmental Engineering, Florida A&M University –Florida State University College of Engineering, Tallahassee, FL 32310, USA F.J. Masters : Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL 32611, USA | ||