本研究分別在澎湖水道、沿南海21°N及黑潮流域利用CTD/LADCP/ MicroRider觀測紊流混合特性，分析方法是以Thorpe overturn為主，並且輔以直接量測紊流微結構以及剪切和應變的參數法推算。
研究結果顯示，此三個不同的海域均有其特殊的紊流特性與動力機制。澎湖水道由於具北窄南寬的喇叭狀地形與強勁的半日潮流特性，底床產生的紊流混合分布由水道南方入口至水道北方尾端混合逐漸增強，其紊流擴散係數在水道最窄處達到最大值。由40小時的長時間定點下放觀測結果得知，其底層混合係數與潮位呈現正相關的相互消長現象，此擾動會從海底往上傳遞並漸減。
黑潮流域分成三個區域來討論，第一為帶有強勁洋流動力的黑潮主軸區、第二為上層流場不穩定位在台灣東南近岸的黑潮鋒面區、第三則為中上層流場不穩定的蘭嶼尾流區。在黑潮主軸流速大於0.8m/s的區域中，水團混合現象反而較其他流速較小的非主軸區小，在黑潮鋒面區則可以在上層100 m內發現到以往只出現在底層的混合強度。在蘭嶼尾流實驗中，在蘭嶼島後方意外遇到了短暫的渦旋現象，本研究分別在渦漩存在及消失時各做了一次觀測下放，其觀測結果配合三條橫跨黑潮的測線發現，在蘭嶼後方中上層水團較不穩定易發生混合。
沿著南海21°N橫跨呂宋海峽測線，此區域海底地形粗糙，變化劇烈，存在海脊和海山等顯著地形，在此區域地形與內潮的條件配合下，內潮能量會在南海與呂宋海峽底部消耗，此動力來源與地形造就了高達2000 m厚且紊流混合係數達10^(-2) m^2 /s的底部混合。另外本研究也發現呂宋海峽東西兩邊因地形高度差所造成的底部混合厚度差異等現象。

This study investigates the turbulent mixing characteristics of Peng-hu Channel,
South China Sea along 21°N and the Kuroshio region by using CTD/LADCP and
MicroRider. Dissipation rate of turbulent kinetic energy or thermal variances is
estimated primarily by the Thorpe overturn method, and is compared with the
microstructure turbulence from direct measurement as well as those estimated from
the parameterization method based on shear and strain spectra.
Our results indicate that there are different turbulent characteristics and dynamic
mechanisms at these three regions. Because of its funnel-shaped topography and strong
semi-diurnal tides in the Peng-hu Channel, the turbulent mixing and eddy diffusivity
reach a maximum value at the narrowest part of Peng-hu Channel near its sea bottom
and show a clear tidal variation.
In the main stream of Kuroshio where the current speed is faster than 0.8 m/s,
turbulent mixing is not particularly stronger than non-main stream zone. In the
Kuroshio frontal zone between the Kuroshio and the coastal waters off east Taiwan
coast, strong turbulent mixing in the surface layer can be detected. Island wake which
is formed when Kuroshio runs into the Lan-yu Island is a transient feature. Strong
mixing in the upper 100 m accompanied with upwelling and vortices were observed
during one event.
The topography along the latitude of 21°N is rugged and rough in the Luzon
Strait which consists of several ridges and seamounts. Due to its complicated
topography and generation of strong semi-diurnal internal tides, eddy diffusivity as
high as 10^(-2)m^2/s was measured in the bottom layer of the Luzon Strait.

章 次 頁 次
謝 誌…………………………………………………… i
中文摘要………………………………………………ii
英文摘要………………………………………………iii
目錄……………………………………………………iv
圖目錄…………………………………………………v
表目錄…………………………………………………viii
ㄧ、緒論 ……………………………………………1
1.1前言 ………………………………………………1
1.2研究動機 …………………………………………3
二、使用儀器與研究海域 ……………………………6
2.1 CTD/ LADCP　……………………………………6
2.2 MicroRider…………………………………………6
2.3研究區域航次資料…………………………………7
三、資料分析方法 …………………………………14
3.1 LADCP 與 CTD 數據處理 ……………………14
3.2 Thorpe scale method ………………………… 17
3.3 Parameterization ………………………………18
3.4 MicroRider數據處理 ……………………………22
四、結果與討論 ……………………………………30
4.1澎湖水道 …………………………………………30
4.2黑潮流域 …………………………………………34
4.3南海沿著緯度21°N ……………………………39
4.4方法比較 …………………………………………42
五、結論與未來展望 ………………………………78
參考文獻 …………………………………………… 81

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