內波是一種因海水密度垂直分層所引發形成的界面波動現象，其波動可以傳播很遠的距離而能量不消散；內波對於海洋的傳送上扮演很重要的角色，它能將深處的營養鹽帶到較暖的淺層，而促進生物的成長；對水下聲學、海洋工程和潛艇的航行也有很大的影響，所以最近幾年來有許多學者投入內波研究，本研究主要的研究著重於南海內波產生的機制與傳遞方式。主要在探討內波產生的機制與產生的位置，使用Princeton Ocean Model (POM)模式模擬，分為兩部分模擬，一為較大的區域網格：3.6km，範圍E118°~123°,N18°~22°(140*112*41)，另一區域網格：1.6km，範圍為E118.5°~123 °,N19.5°~21.5°(270*120*41)，模擬時間共25天（間隔時間1小時），南北兩邊均設定為輻射邊界，東邊則利用WXTide32取得水位再分別帶入驅動，西邊也設定為輻射邊界。主要模擬2005年5月期間的所有三維流場、溫度、斜壓流速分佈、斜壓能量通量、經驗正交函數、頻譜分析、福祿數，各別分析在恆春海脊東西兩側的斜壓流速，也近一步探討內波產生的區域，其模式模擬的斜壓速度可代表內波的傳遞。經驗正交函數分析結果顯示，恆春海脊東側流場複雜至少有三個模態產生。頻譜分析斜壓流速後發現有12小時的週期，此為半日內潮。福祿數計算後發現巴旦島附近有較大值產生。主要結果發現，在下午2~4點時（此時正逢漲退潮交換期間）巴旦島上有較高的斜壓能量產生，此時為內潮產生的時間點;當潮流通過巴旦島後會產生半日內潮，此半日內潮將往下傳遞，通過恆春海脊後則在表層200m~300m附近傳遞。

Internal waves are vertical displacements of stratified water which can propagate a long distance without much energy dissipation. It plays on important role in conveying nutrient from deep ocean to shallower layers, and promoting biological growth. It also affects acoustics, ocean engineering and submarine navigation. Therefore, in the last few years, many scholars have devoted the research of internal waves, especially their generation and transportation in South China Sea. This research discusses the internal wave source, through the Princeton Ocean Model (POM). There are two simulations, one has bigger grid size 3.6km for the whole Luzon Strait in the region, 118°E ~123°E 18°N ~22°N, the other has smaller grid of 1.6km, for 118.5°E ~123°E and 19.5°N ~21.5°N. The total simulation period is 25 days, The north and south bomdawes use radiation boundary condition, the east side is driven by tidal calculated from WXTide32 model, the west side also uses radiation boundary condition. Three dimensional flow field during May, 2005, is simulated temperature, baroclinic velocity distribution, baroclinic energy flux, Empirical Orthogonal Functio ns (EOF), Fast Fourior transform (FFT), buoyancy frequency and Froude number are all analyzed, The results show that, when tidal current near the Batan island has the stronger baroclinic flow downward to transmit, after through Heng-Chun ridge the baroclinic energy flux to concenter, extrapolated this time possibly produces for internal tide.

章次 頁次
中文摘要 ……………………………………………………………I
英文摘要 ……………………………………………………………II
目錄 ……………………………………………………………III
圖目錄 ……………………………………………………………V
表目錄 ……………………………………………………………Ⅶ
第一章　緒論 …………………………………………………………1
1-1 地形區域介紹……………………………………………………2
1-2 內波介紹 ……………………………………………………3
1-3 內波發生之前人研究……………………………………………4
1-4 南海內波之觀測資料……………………………………………5
第二章 數值模式 ………………………………………………… 10
2-1 POM模式簡介……………………………………………………10
2-2 模式設定……………………………………………………… 11
第三章 模式結果 ………………………………………………… 14
3-1 驗證比較……………………………………………………… 14
3-2 發生機制……………………………………………………… 17
3-2.1 斜壓速度 ……………………………………………………17
3-2.2 EOF……………………………………………………………19
3-2.3 FFT 頻譜分析 ………………………………………………24
3-2.4 福祿數(Froude number)……………………………………26
3-2.5 能量通量(energy flux)……………………………………29
3-2.6 垂直剖面分析 ………………………………………………32
3-3 產生波源區域………………………………………………… 35
3-4 恆春海脊東西兩側比較……………………………………… 39
3-5 內波波源產生的時間點……………………………………… 43
第四章 結果與討論………………………………………………… 46
第五章 總結………………………………………………………… 48
參考文獻 …………………………………………………………… 49
附錄 ………………………………………………………………… 53

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