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題 名 | 波浪通過橢圓形潛堤之變形=Wave Transformations over a Submerged Elliptic Breakwater |
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作 者 | 許朝敏; 林銘崇; | 書刊名 | 海洋工程學刊 |
卷 期 | 10:2 2010.12[民99.12] |
頁 次 | 頁143-162 |
分類號 | 443.31 |
關鍵詞 | 布斯尼斯克方程式; 碎波; 橢圓形潛堤; 波浪聚焦; Boussinesq equations; Wave breaking; Submerged elliptic breakwater; Wave focus; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究旨在應用布斯尼斯克方程式(Boussinesq equations),探討波浪通過緩變地形橢圓形潛堤之變化。文中以Wei et al. (1995)所推導之全非線性布斯尼斯克方程式爲基礎,以Kennedy et al. (2000)建議加入碎波項以模擬波浪碎波,並使用Wei and Kirby (1995)所提出之數值計算方法,在計算領域內使用造波源函數加上一適當之消波邊界條件,以消除計算領域內產生之數值反射波,增加模式穩定性。與實驗值互相驗證結果顯示,無論在非碎波與碎波條件下,本模式對於波浪變形的模擬相當良好。在不同入射波角度(0°, 15°, 30°)計算結果顯示,當波浪通過緩變地形下橢圓形潛堤時,波浪會在潛堤後方產生波浪聚焦現象,而當波浪斜向入射時,聚焦區中心線與波浪入射角度一致;在相對水深較小條件下,其最大無因次波高值會較大。 |
英文摘要 | This study investigates wave transformations over a submerged elliptic breakwater on a sloping bottom by numerical calculations. The theoretical model is based on the fully nonlinear Boussinesq equation applied by Wet et al. (1995). The Bottom friction, wave breaking, and sub-grid lateral turbulent mixing as proposed by Kennedy et al. (2000), are also included in the equations. The numerical model utilizes the Fourth-Order Adams-Bashforth-Moulton Predictor-Corrector Scheme proposed by Wet and Kirby (1995) and is combined with a source function and absorbing boundary condition to enhance calculations stability. The numerical results and experiments appear to be in agreement with each other in non-breaking and breaking wave cases. Several numerical experiments are conducted for waves with incident angles of 0°, 15° and 30°. Numerical results show the phenomena of wave focus in the rear of the elliptic shoal. The wave focus region is located in the direction of the incident wave. Non-dimensional wave height increases as the relative water depth decreases. |
本系統中英文摘要資訊取自各篇刊載內容。