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題名 | 波浪通過梯形潛堤之變形=On the Transformation of Water Waves Propagating Over Submerged Trapezoidal Dikes |
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作者 | 黃清哲; 董志明; 郭金棟; | 書刊名 | 中國土木水利工程學刊 |
卷期 | 10:4 1998.12[民87.12] |
頁次 | 頁773-782 |
分類號 | 443.31 |
關鍵詞 | 波浪變形; 梯形潛堤; 調和波; Wave deformation; Submerged trapezoidal dikes; Harmonics; |
語文 | 中文(Chinese) |
中文摘要 | 本文應用數值方法求解二維非穩態的Navier-Stokes方程及完整的自由液面邊界 條件,以模擬波浪通過梯形潛堤的變形及流場的特性。數值模擬所得結果與實驗值不論定性 或定量上皆相當吻合。在確定數值方法的準確性之後,本文分別探討潛堤形狀固定時不同 Ur 數入射波通過潛堤的變形及入射波不變時不同潛堤高度對波浪變形的影響。 計算結果顯 示入射波 Ursell 參數較大時,波浪通過潛堤後主頻波的振幅衰減較大。當入射波條件固定 時,梯形潛堤高度越高,波浪通過潛堤後主頻波的振幅衰減也越大。此外,波浪通過潛堤所 形成的流場,文中也加以討論。 |
英文摘要 | The 2-dimensional unsteady Navier-Stokes equatios along with the exact free surface boundary conditions have been solved to simulate the deformation of water waves propagating over submerged dikes. Numerical results have been compared with the experimental data to verify the accuracy. Transformation of incident waves of different Ursell numbers passing over trapezoidal dikes of different heights were studied. The results showed that, the first harmonic of the wave decays faster as Ursell number increases. If the incident wave remains unchanged, the first harmonic decays faster as the height of the dike increases. The main characteristics of the flowfields induced by the wave motion were also briefly discussed. |
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