In the design of support structures for offshore wind turbines, the JONSWAP spectrum is usually used to calculate fatigue loadings induced by waves in the frequency domain. It is interesting to study whether the wave spectra observed in the Taiwan Strait agrees with the JONSWAP spectrum. Buoy observations of the surface elevation acted on by northeast monsoons were employed to calculate the wave spectra with the ensemble average grouped by wave ages. The results show that the spectral peak energy grows and the frequency of the spectral peak decreases with the increase of the wind speed. The mean spectra with young wave ages show good agreement with the JONSWAP spectrum, while the lower frequency portions show higher energy. This indicates that the sea state developed offshore of Changhua is a mixture of wind waves and swells.
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