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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39942

Title: 以布斯尼斯克模式探討花蓮港港池共振現象
Authors: 鄭欽鐘
Contributors: 國立臺灣海洋大學:海洋環境資訊學系
Date: 2004-11
Issue Date: 2017-01-10T06:41:06Z
Abstract: 花蓮港港池共振已是個長久的問題。導致許多船舶必須在颱風抵達之前離港。許多數值模擬已經試著去了解此共振問題,然而大部份的研究都是使用規則波模式,比如緩坡方程式模式。本研究以布斯尼斯克波浪模式(MIKE21-BW)來模擬入射花蓮港的波浪。本研究以週期25秒∼1000秒能量密度相等的白噪頻譜模擬入射波。以其模擬結果分析各碼頭的波浪頻譜及波高增幅係數。其次以接近週期100秒的規則波與不規則波為入射波浪。本研究也以安珀颱風在花蓮港外海的實測波浪資料模擬。

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.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/39942
Appears in Collections:[海洋環境資訊系] 演講及研討會

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