為了解高屏溪口海域的流場及溫鹽場變化，進行多次的現場觀測，利用都卜勒流剖儀(towed ADCP、sb-ADCP、bm-ADCP、Aquadopp)、CTD及自計式溫鹽(深)儀(XR420、Seacat37)等儀器於高屏溪、近岸陸棚及高屏峽谷頭探測流場、溫度、鹽度及潮位等。透過調和分析、濾波分析及頻譜分析等方法進行水文及溫鹽場的探討。
前人研究顯示高屏峽谷下游的冷水漲潮時向東流入峽谷；退潮向西流出峽谷。本研究顯示到了峽谷頭底層冷水未由峽谷頭進入高屏溪，峽谷下層之冷水疑似由峽谷轉彎區湧上近岸陸棚，隨漲退潮沿岸擺蕩。歸納研究結果：(1)高屏峽谷頭底層流場及溫度場受潮汐影響，高潮前、後3小時為順下峽谷流，峽谷頭暖水帶出峽谷；低潮前、後3小時為逆上峽谷流，峽谷下游冷水進峽谷，冷水最高上升至水深30米。(2)高屏近岸表層流場漲潮時流向東南；退潮時流向西北，與外海陸棚邊緣之流場相反。(3)高屏溪口流場以潮流為主導，漲潮時低溫高鹽海水流向上游；退潮時高溫低鹽河水向出海口流，潮流振幅隨深度減小。

This study investigates the structures of flow field in the mouth of Kao-Ping River, southwest Taiwan. The data used in this study are collected from several cruises of field observations using research vessel OR3 and fishing boats. Instruments deployed include bmADCP, sbADCP, towADCP, Aquadopp, CTD, XR420 and Seacat37. Spatial and temporal variations of flow, sea level, temperature and salinity data are sampled. The collected data are analyzed through harmonic analysis, low-pass filter and FFT.
Results from previously study showed that cold water flowed eastward into the canyon during flood, and westward out of the canyon during ebb. This study shows that the canyon head is not the channel for bottom layer water to climb up into the shallow bank or the river (perhaps the bottom water climb up over shelf at the turning of the canyon 5 km offshore). The summaries are: (1)Water mass are moving around dominated by the oscillation M2 tidal current. There are 3 hours lag between sea level and flow. Maximum out canyon flow found at the peak of flood, while in canyon flow found at the low water. (2)The coastal surface water flows southeast during flood, and goes to northwest during ebb. (3)Tide current is the primary dynamic in the Kaoping River.During flood, lower temperature and higher salinity seawater is up river. During ebb, higher temperature and lower salinity is down the river. Amplitude of tidal current decreases with depth (likely due to bottom friction) at river mouth depth of 3 meters.

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………………………………………………………………… XI
第一章、緒論………………………………………………………… 1
1-1.高屏溪介紹………………………………………………… 1
1-2.文獻回顧…………………………………………………… 4
1-3.研究目的…………………………………………………… 8
第二章、現場觀測…………………………………………………… 9
2-1.定點觀測…………………………………………………… 9
2-1-1.河口底碇觀測………………………………………… 9
2-1-2.峽谷頭錨碇觀測……………………………………… 11
2-2.拖曳式測流(towed ADCP)及表面溫鹽(Seacat37)……… 12
2-3.船碇式測流(sb-ADCP) …………………………………… 15
2-4.水文觀測(CTD) …………………………………………… 16
2-5.資料品管…………………………………………………… 19
2-5-1.Aquadopp……………………………………………… 19
2-5-2.towed ADCP、Sb-ADCP ……………………………… 19
2-5-3.CTD …………………………………………………… 21
2-5-4.潮位…………………………………………………… 22
第三章、分析方法…………………………………………………… 24
3-1.調合分析…………………………………………………… 24
3-2.頻譜分析…………………………………………………… 25
3-3.濾波分析…………………………………………………… 25
第四章、結果與討論………………………………………………… 26
4-1.峽谷頭觀測………………………………………………… 26
4-1-1.底層時序流場變化…………………………………… 26
4-1-2.時序流場及溫度剖面………………………………… 28
4-1-3.橫切峽谷頭溫度剖面………………………………… 31
4-1-4.沿峽谷軸流場………………………………………… 34
4-2.近岸陸棚表面環流觀測…………………………………… 37
4-2-1.大潮時空間流場及表面溫鹽觀測…………………… 37
4-2-2.小潮時空間流場及表面溫度觀測…………………… 46
4-3.河口觀測…………………………………………………… 51
4-3-1.時序流場及溫鹽變化………………………………… 51
4-3-2.空間流場……………………………………………… 58
4-4.入海口表面環流觀測……………………………………… 59
第五章、結論及建議………………………………………………… 67
5-1.結論………………………………………………………… 67
5-2.建議………………………………………………………… 68
參考文獻……………………………………………………………… 69
附錄Ａ、中英文縮寫對照表………………………………………… 71
附錄Ｂ、ＣＴＤ測站資料表………………………………………… 72

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