In situ measurement of strong wind velocity spectra and wind characteristics at Keelung coastal area of Taiwan

Abstract

In this study, we report the in situ measurement results of the strong wind turbulence statistics and wind velocity spectra at the Keelung coastal region of Taiwan. Strong winds induced by Babs typhoon on Oct. 25–27, 1998 were measured with an ultrasonic anemometer. The in situ measurement data included three components of the wind velocity and temperature. The probability density functions for the three components of the wind velocity fluctuations and the temperature fluctuation are shown to be close to the Gaussian distributions. The turbulence intensity and integral length scales of the strong wind are calculated. The observed longitudinal wind spectrum is found to be in agreement with the Von Karman's spectrum and the wind spectrum equation of Eurocode 1. Observational results of the lateral and the vertical wind spectra are approximately close to the predictions of the isotropic turbulence spectra equations.