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研究生:黃任億
論文名稱:澎湖海谷之形貌、3.5KHz回聲圖及其海床表面可能的沈積作用
指導教授:俞何興俞何興引用關係
指導教授(外文):Ho - Shing Yu
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:海洋研究所
學門:自然科學學門
學類:海洋科學學類
論文種類:學術論文
論文出版年:1999
畢業學年度:87
語文別:中文
論文頁數:95
中文關鍵詞:澎湖海谷3.5千赫回聲圖沈積作用
外文關鍵詞:Penghu Sea-valley3.5KHz EchogramsSedimentary processes
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位於台灣海峽東南側介於台灣與澎湖群島間南北向的凹陷,依其形貌特徵應名為澎湖海谷,而非名為澎湖水道。大致上為一南寬北窄、南低北高喇叭型狀的海底形貌,總長度大約150公里,平均寬度為46公里,東、西側谷壁平均寬度各約27、19公里,海谷主體最深處約為215公尺,而平均深度為164公尺,兩側谷壁坡度很平緩但並不對稱,通常東側坡度大於西側,其平均坡度約0.1~0.5度之間,而海谷谷軸的坡度約0.06度,為一非常平緩的傾斜地貌。
由海研一號421、547兩航次之水深資料可發現,澎湖海谷內的形貌由北往南變深,而且受侵蝕的程度也由北向南加強,另外在北段的部分谷軸有向西北延伸的趨勢,因此筆者依其谷軸的走向及谷軸的坡度將澎湖海谷分為澎湖海谷遷移或消逝帶(北緯23度54分以北)、澎湖海谷主體(北緯22度40分~北緯23度54分)及澎湖海谷及澎湖海底峽谷過渡帶(北緯22度40分以南)等三段。
而根據3.5KHz回聲特徵顯示的海床微地形、海床表面沈積作用等訊息,大致上可將澎湖海谷區分為層狀(位於澎湖海谷西側及東側北段)、崎嶇狀(位於澎湖海谷中央部分)、雙曲線狀(位於澎湖海谷最南側)、島棚狀(位於澎湖海谷東側南段)及砂波型態(位於澎湖海谷東北部)等五種3.5KHz回聲特徵型態。
針對澎湖海谷之形貌及3.5KHz回聲特徵圖所代表的地質意義,推測澎湖海谷中央部分現今仍處於侵蝕狀態,而且南段侵蝕的程度大於北段,海谷西側除了靠近澎湖群島附近以外,大致是上以沈積作用或輕微的侵蝕為主,而海谷的東側則是來自台灣大量的沈積物向外堆積,大致以外傘頂洲為界分為南北兩段,南段可能發生沈積物崩移而造成部分侵蝕的現象形成島棚狀回聲特徵,北段則以沈積作用為主而形成層狀回聲特徵。
摘要……………………………………………………………………Ⅰ
目錄……………………………………………………………………Ⅱ
圖目錄…………………………………………………………………Ⅲ
表目錄…………………………………………………………………Ⅵ
第一章 緒論……………………………………………………………1
1-1前言…………………………………………………………1
1-2 區域地質概述………………………………………………5
1-3 前人研究……………………………………………………8
1-4 研究目的…………………………………………………13
第二章 澎湖海谷形貌………………………………………………15
2-1 澎湖海谷的命名…………………………………………15
2-2 澎湖海谷的形貌…………………………………………20
2-3 小結………………………………………………………40
第三章 3.5千赫回聲儀的分析原理及其回聲型態的解析能力…45
3-1 3.5千赫回聲儀的分析原理………………………………45
3-2 3.5千赫回聲型態的解析能力……………………………45
3-3 3.5千赫回聲特徵分類及其評估…………………………50
3-3.1 3.5千赫回聲特徵分類………………………………50
3-3.2 3.5千赫回聲特徵分類評估…………………………58
第四章3.5KHz回聲型態的分佈及海床表面沈積作用……………62
4-1 3.5KHz回聲型態的分佈…………………………………62
4-2 3.5KHz回聲型態及其地質上的解釋……………………66
4-3 澎湖海谷現生的沈積作用………………………………75
第五章 討論及未來展望……………………………………………77
5-1 澎湖海谷與基隆海谷的比較……………………………77
5-2 未來展望…………………………………………………84
第六章 結論…………………………………………………………85
參考文獻………………………………………………………………88
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