為了解高屏峽谷流場及水團特性受地形水深之影響，本研究結合了五個航次的觀測，日期分別為2004/12/13~17、2005/5/23~27、2005/10/24、2005/12/4~5及2006/3/13~17，利用都普勒流剖儀（Sb-ADCP）、溫鹽深儀（CTD）、錨碇式ADCP、錨碇溫度串於高屏峽谷海域進行流場、溫度、鹽度及潮位等觀測。並透過調和分析、濾波分析、頻譜分析、EOF分析等方法進行探討。
研究結果發現：（1）高屏峽谷的流場在峽谷內或陸棚上均為半日潮所主導，以M2潮流為主。流速流向受到地形的影響，峽谷內越深層M2潮流的振幅越大，潮流橢圓的主軸與峽谷主軸平行。（2）峽谷流場與溫度場受潮汐的影響，在漲潮時，表層流為東南流，峽谷底層為溯上峽谷流，將深海較冷的水帶進峽谷；退潮時，表層流為西北流，峽谷底層為順下峽谷流，將較暖的海水帶出峽谷。（3）低通過濾後之海流從表層到底層呈現逆時針狀態旋轉，可解釋為海底摩擦效應所致。（4）由EOF分析水文資料結果可知，在峽谷內之水團運動，88﹪之變化量可由半日潮訊號解釋。

This study investigates the variations of flow field and water mass due to the influence of topographic effect in the Kaoping Submarine Canyon. The data used in this study are collected from five cruises of field observations using research vessel OR3. Instruments deployed include ship-board ADCP、CTD、tow-ADCP, moored ADCP and vertical arrays of temperature loggers. The collected data are analyzed through a variety of time series analysis technique, such as harmonic analysis、low-pass filter、FFT and EOF analysis.
The results show that (1) the flow in the Kao-ping Canyon was dominated by semi-diurnal tide. Harmonic analysis shows that both bottom layer and the shelf region are dominated by the M2 tide. The amplitude increases with canyon depth, and the major axis of tidal current align with canyon orientation. (2) Water mass are moving around by the oscillation tidal current along the canyon. During flood, surface water flow to southeast, while bottom flow is up canyon. During ebb, surface water goes to northwest, while bottom flow is down canyon. (3) The low-pass flows indicate a counter-clockwise rotation from surface down, which is explained due to bottom frictional effect. (4) EOF analysis of CTD profiles suggested that the first mode (semi-diurnal tide) can explain 88% of the variations.

章次 頁次
謝誌……………………………………………………………………Ⅰ
中文摘要………………………………………………………………Ⅱ
英文摘要………………………………………………………………Ⅲ
目錄……………………………………………………………………Ⅴ
圖目錄…………………………………………………………………Ⅶ
表目錄…………………………………………………………………Ⅹ
第一章、 前言……………………………………………………… 1
1-1.峽谷介紹………………………………………………………1
1-2.前人研究………………………………………………………3
1-3.研究目的………………………………………………………7
第二章、 現場觀測與資料蒐集…………………………………… 8
2-1.錨碇儀器串……………………………………………………8
2-2.Sb-ADCP………………………………………………………16
2-3.CTD水文觀測…………………………………………………18
第三章、 資料處理與分析方法……………………………………23
3-1.資料品管…………………………………………………… 23
3-1-1.Sb-ADCP資料品管處理………………………………23
3-1-2.CTD……………………………………………………24
3-1-3.潮位………………………………………………… 25
3-2.分析方法…………………………………………………… 27
3-2-1.調和分析…………………………………………… 27
3-2-2.頻譜分析FFT…………………………………………28
3-2-3.濾波分析Lowpass……………………………………28
3-2-4.EOF分析………………………………………………29
第四章、 結果與討論………………………………………………30
4-1.錨碇點ADCP測流…………………………………………… 30
4-2.錨碇點溫度串與CTD…………………………………………42
4-3.Sb-ADCP沿峽谷軸……………………………………………53
4-4.Sb-ADCP表層流場……………………………………………57
4-5.EOF分析結果…………………………………………………63
第五章、結論……………………………………………………… 66
第六章、參考文獻………………………………………………… 67
附錄A、中英縮寫對照表……………………………………………71
附錄B、CTD測站資料表…………………………………………… 72

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