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研究生:林振勛
研究生(外文):Jen-Shiun Lin
論文名稱:於斜坡上傳輸之上舉型孤立內波特性之實驗研究
論文名稱(外文):Experimental Study on the Characteristics of Flow Induced by an Internal Solitary Shoaling Wave
指導教授:林呈林呈引用關係
學位類別:碩士
校院名稱:國立中興大學
系所名稱:土木工程學系所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:79
中文關鍵詞:孤立內波流場
外文關鍵詞:Internal Solitary Wave
相關次數:
  • 被引用被引用:1
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本研究利用精密內波實驗水槽,於水槽中先以淡、鹽水佈置兩層穩定分層流體,再以改變位能差 之方式造出孤立內波。為瞭解近岸海洋孤立內波流場機制,將實驗模型設定為一30°固定角度之斜坡,以相同上下水層密度比( )、相同水深比( )及相同造波區段長( L = 15 cm )之水體條件,改變造波區段位能差( = 5 cm、10 cm、15 cm、20 cm),以生成穩定之上舉型孤立內波,且在實驗水體中加入色素染劑以進行流場可視化,並使用高速攝影機與質點影像測速儀 ( PIV ) 進行之流場量測分析。
首先對入射斜坡前之孤立內波作波型檢測,經檢測後,本實驗之孤立內波相當符合Kdv或mKdv理論波型。接著針對孤立內波傳遞至斜坡後,發生溯升與溯降之情形作觀測,並以傾斜30°角平行斜坡面的觀測座標作進一步微觀之量測,探討溯升及溯降時,內部流場速度隨著斜坡長度與無因次T時間之變化情形。
最後引用Lin et al. (2008) 所提出的剪力層觀念與分析方法,探討孤立內波在斜坡上溯升及溯降時,鹽水層與淡水層交界面處之速度變化,以雙曲線tanh函數對此速度變化分佈作最適化分析後,將此曲線函數進行y方向上的一次及二次微分分析,利用一次和二次微分後所得到之峰值,定義出剪力層之特徵長度與速度尺度,接著使用無因次化之特徵參數對不同實驗條件及不同剖面位置之量測資料進行相似性分析,依溯升與溯降之速度方向不同,分別可獲得一正負號差異之最適化曲線。
The purpose of this study is to understand the flow field of internal solitary wave running up and down along a sloping bottom. The experiments of internal solitary waves were carried out using stratified two-layer fresh/saline water in the wave flume. The slope of sloping-bottom model was set with a fixed angle of 30 °. The experiments were conducted under the same density ratio ( ) and the same thickness ratio of the upper and lower layers (h1/h2 = 7). The internal solitary waves were generated by changing different potential energies ( = 5 cm, 10 cm, 15 cm, and 20 cm). The dye was added into water for flow visualization. The particle image velocimetry (PIV) was used to measure quantitatively the velocity distribution of internal solitary waves. The high-speed camera was used to capture the images of flow field.
The validations of the incident internal solitary wave was carried out in absence of obstacle. Good agreement was obtained from the comparison between the wave shape of the internal solitary wave and the Kdv or mKdv theory. The horizontal velocity was validated by using FLDV. The wave propagation processes, including run-up and run-down, were observed by flow visualization. The measuring coordinate was tilted to an angle of 30 ° for the measurement of velocity distribution along the slope. The characteristics of velocity profile were investigated in detail with dimensionless time T during the run-up and run-down processes. Using shear layer concept proposed by Lin et al. (2008), velocity distribution of the internal solitary wave was analyzed for run-up and run-down processes. The velocity and length scales were clearly defined using hyperbolic tangent function. The similarity profile of velocity distribution for shear layer has been found in the study.
中文摘要 I
英文摘要 II
目 錄 III
圖 目 錄 V
表 目 錄 VII
相片目錄 VIII
符號說明 X

第一章 緒論 1
1-1 研究動機 1
1-2 文獻回顧 3
1-3 本文架構 8
第二章 實驗設備及模型布置 9
2-1 實驗水槽及模型佈置 9
2-1-1 內波實驗水槽 9
2-1-2 攪拌水箱及定水頭水箱 9
2-1-3 實驗模型與座標系統 11
2-2 PIV量測系統 11
2-2-1 高速攝影機 11
2-2-2 PIV量測與計算原理 13
2-3 FLDV量測系統 15
2-4 電導度式鹽分濃度計 17
第三章 實驗方法與初步實驗 18
3-1 穩定分層之實驗水體 18
3-2 孤立內波的生成與傳遞 20
3-2-1 造波個數 20
3-2-2 造波大小 21
3-2-3 孤立內波波形 23
3-3 PIV收斂性檢測及以FLDV進行速度驗證 28
第四章 實驗結果與討論 31
4-1 孤立內波於斜坡上傳輸之流場特性 31
4-2 孤立內波鹽水層在斜坡上溯升及溯降之流場特性 50
4-3 孤立內波剪力層相似性分析 60
第五章 結論與建議 73
5-1 結論 73
5-2 建議 74
參考文獻 76
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