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研究生:郭郁芬
研究生(外文):Yu-Fen Kuo
論文名稱:雙眼牆形成之正壓動力探討
指導教授:郭鴻基郭鴻基引用關係
指導教授(外文):Hung-Chi Kuo
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:大氣科學研究所
學門:自然科學學門
學類:大氣科學學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:72
中文關鍵詞:颱風渦旋結構雙眼牆
外文關鍵詞:concentric eyewallsvortex structuretyphoon
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本研究延續過去雙渦旋實驗之工作,以Dritschel and Waugh雙渦旋實驗設計為主要架構,將雙眼牆形成之觀測結果理想化為一小而強之渦旋(代表颱風中心渦旋)與一大而弱之渦旋(代表外圍之非對稱對流區)之雙渦旋交互作用。論文中使用不同結構之渦旋進行雙渦旋實驗,探討雙眼牆結構形成條件與渦旋結構之關係。
實驗結果顯示,當中心渦旋為修正阮肯渦旋時,在最大切向風半徑外側存在渦度裙帶,受此渦度梯度影響,雙渦旋最大切向風處間距需較大、中心渦旋愈強,乃有利雙眼牆之形成。若二渦旋過近,甚至相連,受渦度平流產生之環流作用,二渦旋必合併,即使渦度參數比為10仍為合併。因此,二渦旋保持適當之距離,可避免座落於另一渦旋之渦度梯度上,導致合併。此外,受渦度裙帶梯度之影響,在雙渦旋間距較大時,仍可產生雙眼牆結構,而非互繞。若中心渦旋為高斯渦旋或CW渦旋時,最大切向風速未若考慮阮肯渦旋或修正阮肯渦旋時來得大,因此在中心渦旋強度不夠強時,無法組織出外眼牆結構。
在考慮中心渦旋均為修正阮肯渦旋,半徑比為1/5與1/4之一系列實驗,我們發現:只要大而弱渦旋夠大,無論中心渦旋結構為何,雙眼牆結構之形成條件主要由雙渦旋距離與渦度比決定。因此,無論颱風中心渦旋結構為何,只要非對稱對流區夠大,而颱風中心渦旋本身夠強,二者間保持一適當之距離,將有利雙眼牆結構之形成。

摘要 …………………………………………………… i
目錄 …………………………………………………… ii
圖表說明 ……………………………………………… iii

第一章 前言 …………………………………………… 1

第二章 二維亂流與雙渦旋實驗 ……………………… 5
2.1二維亂流 …………………………………………… 5
2.2雙渦旋實驗 ………………………………………… 8

第三章 數值模擬 ……………………………………… 12
3.1模式設定 …………………………………………… 12
3.2雙眼牆形成之探討:r = 1/5 …………………… 15
3.3雙眼牆形成之探討: a 渦旋,r = 1/4 ………… 21

第四章 總結 …………………………………………… 24

參考文獻 ………………………………………………… 27
圖表 ……………………………………………………… 31


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