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研究生: 林幼淳
論文名稱: 波浪動能影響海溫結構之數值模擬研究
Effects of wave-induced mixing on the temperature structure
指導教授: 吳朝榮
學位類別: 碩士
Master
系所名稱: 海洋環境科技研究所
Graduate Institute of Marine Environmental Science and Technology
論文出版年: 2010
畢業學年度: 98
語文別: 中文
論文頁數: 56
中文關鍵詞: 波浪數值模式溫度結構
論文種類: 學術論文
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  • 本研究透過數值模擬的方式,分析波浪對海水溫度的影響。首先利用波浪模式將海表面波浪的大小參數化,再換算為波浪引起之混合動能,並將混合動能定義為 值,希望透過波浪所引起之混合動能,去改善一般海流模式在夏、秋時期對於表層溫度模擬較差的問題。
      本研究所使用的模式分別為MASNUM波浪模式與南海模式,將波浪模式計算的波浪動能依照不同程度放入南海模式內,並配合南海SEATS測站的溫度資料作為模式的驗證。比較SEATS測站資料與海流數值模式的結果顯示,在秋季的時候,海流模式對溫度的模擬確實較差,而包含 值的海流-波浪耦合模式能夠加強表層海水的混合,改善海流模式對溫度模擬較差的問題。然而增加的混合動能卻也會加深其他月份的混合層深度,造成其他月份有較大的誤差。
      此外,本研究選用強颱—玲玲(2001) 作為研究強風下波浪對溫度影響的對象,並將原波浪模式中線性拖曳係數改變為Oey et al.(2006)的拖曳係數,減低因高風速造成的誤差。結果顯示,包含 值的海流-波浪耦合模式與一般海流模式間的差異在於 值的作用會導致颱風過後的湧升流深度不同。

    致謝 1 摘要 II 目錄 III 第一章 緒論 1 1.1 前言 1 1.2 研究動機 2 1.3 研究區域介紹 3 1.4 研究目的 5 第二章 研究資料與方法 7 2.0 前言 7 2.1 模式介紹 7 2.1.1 MASNUM波浪模式 7 2.1.2 南海模式(South China Sea Model) 11 2.2風拖曳係數 13 2.3 研究方式 16 第三章 研究資料比較與分析 18 3.1 值分布型態 18 3.1.1 值的全球分布 18 3.1.2 南海內的 值分布 19 3.2 垂直混合對溫度結構的影響 20 3.2.1 觀測值與模式結果的溫度結構比較 20 3.2.2 SEATS測站溫度與模式結果的誤差 22 3.2.3 混合層深度的變動 23 3.2.4 混合層深度的誤差 24 3.3 強風下的溫度結構變化 25 3.3.1 不同拖曳係數下 值的改變 25 3.3.2 颱風經過後模式的溫度差異 26 第四章 結論 28 4.1 結論 28 參考文獻 52

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