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|Issue Date: ||2017-01-10T06:41:06Z
Abstract: Resonance in the Hwa-Lien Harbor has long been a problem for the harbor authority. Many ships have had to leave the harbor before arrivals of typhoon. Many numerical simulations had been carried out trying to understand this resonance phenomenon. However, most of the numerical studies used wave models based on regular waves, such as mile-slope equation model. This study used a Boussinesq wave model (MIKE21-BW) to simulate the waves in the harbor. The present study first generate waves with period ranging from 25s to 1000s periods with uniform spectral density, or waves with white noise spectrum, as incident waves. The resulting spectrum and wave amplification factor were calculated for various wharfs. Similarly regular as well as irregular waves with wave periods near 100s were used as incident waves. The simulations were also carried out using waves measured offshore of the harbor during the Typhoon Amber.
It was found from regular wave simulation that resonant periods in the harbor were 80s~100s, 135s~145s and 185s. Regular wave simulation also showed that, although the resonant phenomenon in the harbor occurred lengthwise, there exist another mode, which occurred transversely between wharf 22 and the eastern breakwater with period of 80s, 125s, 130s and 135s. Resonant period from the white noise spectrum simulation were shown to close to that using measured typhoon waves. This indicates that using white noise spectrum is an efficient method for studying harbor resonance. Apparently, one can also use white noise spectrum and the BW model to study ways for alleviating resonance phenomenon in the Hwa-Lien Harbor.
|Appears in Collections:||[海洋環境資訊系] 演講及研討會|
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