本文旨在建立一套數值模式模擬波浪通過不透水雙列潛堤之流場。文中採用有限體積法和高度函數法配合紊流模式求解雷諾平均方程式 (RANSE)。數值計算結果藉由試驗資料驗證波浪通過潛堤後之波高與水平、垂直速度及流場，並與理論解比較線性波層流邊界層速度剖面，比較發現本文數值計算結果與試驗值及理論值非常吻合。本文以變換不透水雙列潛堤間距及波浪條件進行一系列數值驗，探討波浪通過系列潛堤的渦流機制、渦流強度，流線化，並觀察週期內紊流動能的變化及流場中各物理量最大值空間分佈，為研究波浪通過潛堤後非線性效應影響，本文亦討論波浪變形及主頻至三倍頻波浪振幅的變化。

The main purpose of this study is to develop a numerical model to simulate the flow field of wave propagating over two impermeable submerged breakwaters. The numerical model is based on the Reynolds Average Navier-Stokes Equations (RANSE) with a turbulence model which is first verified with the measurement results. Overall, the agreement between the numerical results and laboratory velocity measurements is well. Using the numerical, a series of additional numerical experiments with different wave condition and different space of submerged breakwaters are then performed to investigate the vortex generation and evolution, vortex intensity, a variation of streamline and the turbulence kinetic energy. In order to understand the nonlinear effect after wave propagating over two submerged breakwaters, we also discuss the wave deformation and the change of harmonic wave amplitude.

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