Techno Press
You logged in as Techno Press

Wind and Structures
  Volume 17, Number 2, August 2013, pages 135-162
DOI: http://dx.doi.org/10.12989/was.2013.17.2.135
 


Characterization of open and suburban boundary layer wind turbulence in 2008 Hurricane Ike
S. Jung and F.J. Masters

 
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
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2021 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: info@techno-press.com