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http://dx.doi.org/10.12989/was.2013.17.2.135

Characterization of open and suburban boundary layer wind turbulence in 2008 Hurricane Ike  

Jung, S. (Department of Civil and Environmental Engineering, Florida A&M University-Florida State University College of Engineering)
Masters, F.J. (Department of Civil and Coastal Engineering, University of Florida)
Publication Information
Wind and Structures / v.17, no.2, 2013 , pp. 135-162 More about this Journal
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.
Keywords
hurricane; suburban; turbulence intensities; gust factors; integral scales; power spectra;
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