內潮為高屏峽谷中控制水團運動及物質交換的主要因素。為了解內潮作用造成峽谷內、外沈積物交換之影響，本研究應用四個航次所佈放的定點及船測資料進行探討，儀器觀測日期分別為2004/12/13~17（EXP1）、2005/5/23~27（EXP2）、2008/1/10~11（EXP3）、2008/2/21~22（EXP4），使用儀器包括都普勒流剖儀（ADCP）、魚探聲納（EK500）、CTD、溫度計串等，觀測項目有流速、回波強度、溫度及潮位等水文資料，並透過調和分析、頻譜分析、EOF等方法分析並討論其結果。
研究結果發現：（1）ADCP所記錄的回波強度資料，可以透過校正方法將聲波隨距離衰減影響減少，並應用於水團運動之分析討論。（2）校正後的回波強度與EK500訊號可互相驗證，並能用以觀測懸浮物質隨內潮波動現象。（3）在陸棚深度與底層上方的濁層，會隨內潮運動有上、下波動情形，且峽谷頭部附近海域的高濁度水團，是陸源物質受內潮混合作用所造成。（4）隨內潮波動而有上、下起伏的訊號為濁層懸浮物質；此外，於固定時段移動、滯留且不隨內潮起伏之訊號，依其特性研判為浮游生物群之訊號。

The internal tide in GPSC（Gaoping submarine canyon）is the main factor controlling the movement of watermasses. In order to improve our understanding on the compact of suspended sediment exchange in and out GPSC, the data used in this study are collected from four cruises of field observations using research vessel OR3. Instruments deployed include ADCPs、EK500、CTD and vertical string of temperature loggers. The collected data are analyzed through a variety of time series analysis technique, such as harmonic analysis、FFT and EOF.
The results show that（1）the echo intensity recorded by ADCP through calibration could reduce the decay of echo with the distance. The results seem useful to apply in watermass behavior studies.（2） Echo intensity with calibration were comparable with signal recorded by EK500 which could be validated to each other. These observations were related to sediment resuspension influenced by internal tide. （3）There were two layers of large turbidity, at the depth of canyon edge and near the bottom of canyon, both were fluctuated with two interval tidal frequency.（4）Another band of echo intensity fluctuations, not directly correlate to sediment resuspension, was likely due to vertical migration, of zooplankton or biology effects.

中文摘要 I
英文摘要 Ⅱ
目錄 Ⅲ
圖目錄 Ⅴ
表目錄 Ⅸ
第一章、前言 1
1-1.高屏峽谷 1
1-2.文獻回顧 4
1-3.回波強度 9
1-4.研究目的 10
第二章、現場觀測與資料蒐集 11
2-1.錨碇串資料 11
2-2.船測資料 17
2-2-1.CTD資料 17
2-2-1.EK500資料 18
2-3.潮位資料 19
第三章、資料處理與分析 20
3-1.回波強度品管 20
3-2.回波強度校正方法 24
3-2-1經驗公式 24
3-2-2迴歸校正 26
3-3.回波強度校正結果 31
3-4.校正結果與濁度 36
3-5.資料分析方法 39
3-5-1調和分析 39
3-5-2頻譜分析 39
3-5-3 EOF分析 40
第四章、結果與討論 41
4-1.峽谷流場與水團 41
4-2.影響回波強度變化之因子 47
4-3.內潮之效應 66
4-4.回波強度受內潮的影響 70
第五章、結論及建議 78
5-1.結論 78
5-2.建議 79
第六章、參考文獻 80
附錄A、中英文縮寫對照表 83
附錄B、CTD測站資料表 84

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