Estimating Overwater Friction Velocity and Exponent of Power-Law Wind Profile from Gust Factor during Storms
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 129, Issue 4
Abstract
During storms, the effects of wind loading and drift currents are among the major hazards to offshore structures. In order to objectively determine overwater friction velocity and the exponent of the power-law wind profile, the concept of in-situ gust factor, which reflects the composite effect of air-sea interaction, is employed. During Hurricane Kate in 1985, pertinent meteorological and oceanographic parameters including wind speeds at the standard 10 m height were measured by National Data Buoy Center buoy 42003, located along the hurricane path at 25.88°N and 85.95°W. It is demonstrated that, during this storm, the mechanical turbulence dominates the thermal effect and the exponent of the power-law wind profile is nearly equal to the turbulence intensity in the downwind direction. Relationships among friction velocity, gust factor, and the exponent of the power-law wind profile are also found and provided for engineering applications.
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References
Amorocho, J., and DeVries, J. J.(1980). “A new evaluation of the wind stress coefficient over water surfaces.” J. Geophys. Res., C: Oceans Atmos., 85(1), 433–442.
Arya, S. P. (1988). Introduction to micrometeorology, Academic, San Diego.
DiMarco, S. F., Guinasso, N. J., Jr., Kelly, F. J., and Lee, L. L., III. (1995). “Waves and currents during Hurricane Andrew as seen by the LATEX A array.” Proc., 13th Gulf of Mexico Information Transfer Meeting, U.S. Minerals Management Service, Washington, D.C., 231–235.
Donelan, M. A. (1982). “The dependence of the aerodynamic drag coefficient on wave parameters.” Proc., 1st Int. Conf. on Meteorology and Air/Sea Interaction of Coastal Zone, American Meteorological Society, Boston, 381–387.
Geernaert, G. L., Larsen, S. E., and Hansen, F.(1987). “Measurements of the wind stress, heat flux, and turbulence intensity during storm conditions over the North Sea.” J. Geophys. Res., C: Oceans Atmos., 92(12), 13127–13139.
Graf, W. H., Merzi, N., and Perrinjaquet, C.(1984). “Aerodynamic drag: measured at a nearshore platform on Lake of Geneva.” Arch. Meteorol., Geophys. Bioklimatol., Ser. A, 33, 151–173.
Hamilton, G. D.(1987). “Buoy records set in 1985 hurricanes.” Mariners Weather Log, 31(4), 7–10.
Hsu, S. A. (1988). Coastal meteorology, Academic, San Diego.
Hsu, S. A., Blanchard, B. W., and Yan, Z.(1999). “A simplified equation for Paulson’s formulation for overwater applications.” J. Appl. Meteorol., 38, 623–625.
Panofsky, H. A., and Dutton, J. A. (1984). Atmospheric turbulence: models and methods for engineering applications, Wiley, New York.
Simpson, R. H., and Riehl, H. (1981). The hurricane and its impact, Louisiana State University Press, Baton Rouge, La.
Taylor, P. K., and Yelland, M. J.(2001). “The dependence of sea surface roughness on the height and steepness of the waves.” J. Phys. Oceanogr., 31, 572–590.
Wu, J.(1975). “Wind-induced drift currents.” J. Fluid Mech., 68, 49–70.
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Copyright © 2003 American Society of Civil Engineers.
History
Received: Jun 10, 2002
Accepted: Nov 6, 2002
Published online: Jun 13, 2003
Published in print: Jul 2003
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