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博碩士論文 etd-0006114-175754 詳細資訊
Title page for etd-0006114-175754
論文名稱
Title
以實驗及現場資料分析孤立內波與海表面波譜之關係
Laboratorial and In-situ Data analyses on the Relationship between Internal Solitary Wave and Sea Surface Wave Spectrum
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
97
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2013-11-22
繳交日期
Date of Submission
2014-01-06
關鍵字
Keywords
雷達、波流交互作用、孤立內波、波譜
Spectrum, Internal wave, Wave-current interaction, Radar
統計
Statistics
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The thesis/dissertation has been browsed 5671 times, has been downloaded 581 times.
中文摘要
  波譜用來說明空間中不同波數的波組合之能量分布,根據能量進入造成空間或時間波譜變化多寡,討論頻譜值與海表面擾動之情形。前人的研究中,已描述了地形影響海面波場,主因是上層流場的分佈不均,海流的輻合作用造成海面小波能量輻合;繼之,海表面粗糙度增加;甚而產生碎波。
  本研究基於前進波理論延伸到能量關係造成的輻射應力,其表面重力波受到表面流速變化的影響。前半段水槽實驗以及北南海現場觀測到的實測資料,分析其孤立內波所引致的流場情形。設定平均流速為控制參數,代入推導的波譜能量變化量的第一種理論解析解;第二種理論為不考慮黏滯性、風、非線性波波交互作用等影響下的波流交互作用波譜解析式,設定孤立內波所引致的流速梯度為控制參數。
  結果顯示波譜變化量若只與上層平均流速水平方向交會有關,內波前端波譜能量峰值由短波數成長為長波數,現場雷達波譜顯示長波數部分變化量較小,職是之故現場雷達分析的波譜與理論波譜的性質分析中,理論一比理論二較適合。
Abstract
Wave spectrum is a measure of energy distribution for wave trains of all periods and directions. The shape of wave spectrum is affected by sea surface flow; hence, spectrum can be used to analyze the disturbance on the free surface. Previous studies showed that the sea bottom topography affects the flow and induces uneven distribution of the flow field when an internal wave passes a sill. Convergence of sea surface current enhances the convergence of surface wave, thus increases surface roughness and makes surface waves break.
This study includes the radiation stress of deepwater wave theory. Physical experiments and field investigation in the northern South China Sea are used to analyze the spectrum change due to the change of flow velocity. One theory depends on the mean flow due to internal waves. The other theory of spectral variation depends on the gradient of flow velocity due to internal waves. The former theory implies the spectrum peak in the front part of the internal wave moves to the range of higher wavenumber .The in-situ spectrum observed by radar also shows the same tendency. Therefore, the former theory is more applicable than the later theory.
目次 Table of Contents
謝誌............................................................................... i
摘要............................................................................... ii
Abstract......................................................................... iii
目錄............................................................................... iv
圖目錄............................................................................ vi
符號表............................................................................ xi
第一章 緒論..................................................................... 1
1.1 文獻回顧.................................................................... 1
1.2 研究目的.................................................................... 5
第二章 實驗設計與方法..................................................... 7
2.1 實驗水槽設備與儀器.................................................... 7
2.2 雙眼三維影像系統....................................................... 11
2.2.1 極線幾何.................................................................. 11
2.2.2 外部校正.................................................................. 11
2.2.3 模擬波場驗證........................................................... 14
2.3 斷面影像處理方法........................................................ 17
2.3.1 影像曲率校正............................................................ 17
2.3.2 斷面內波影像處理..................................................... 19
2.4 實驗量測項目及流程.................................................... 22
2.4.1 實驗配置................................................................. 22
2.4.2 實驗方法與步驟....................................................... 25
2.4.3 實驗項目................................................................. 26
2.4.4 造波方法................................................................. 26
2.4.5 實驗流程................................................................. 27
第三章 現場資料與分析方法.............................................. 29
3.1 內波觀測研究區域與背景介紹...................................... 29
3.2 Sb-ADCP流速資料..................................................... 30
3.3 雷達資料................................................................... 30
3.4 分析方法................................................................... 32
第四章 相關理論.............................................................. 35
4.1 波流交互作用理論1..................................................... 35
4.2 群波速度................................................................... 45
4.3 波流交互作用理論2.................................................... 45
第五章 實驗與現場資料分析結果與討論............................. 47
5.1 水槽實驗結果............................................................ 47
5.1.1 表面波率定............................................................. 47
5.1.2 內波初始波形.......................................................... 50
5.1.3 MicroADV資料........................................................ 54
5.1.4 實驗室表面波譜分析................................................ 58
5.2 現場資料分析結果...................................................... 63
5.3 內波造成表面波譜變化性質分析................................... 70
第六章 結論.................................................................... 73
參考文獻......................................................................... 74
附錄................................................................................ 78
附錄一 (4.17)式子解驗證................................................. 78
附錄二 基礎矩陣,極限幾何演算法.................................. 79
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