本研究應用質點影像測速儀 (Particle Image Velocimetry, PIV) 於水槽中量測波浪通過系列潛堤之水位與流場，探討波浪與系列潛堤交互作用後之布拉格共振 (Bragg Resonance) 現象，以及潛堤附近水位、流場與渦流生成及消散之變化。試驗結果顯示，在本研究系列潛堤個數N = 8之配置，隨著入射波浪傳遞至潛堤下游側，波浪通過試驗段潛堤個數越多時，波浪能量衰減的趨勢會越明顯，又以發生布拉格共振時之波浪條件，其透射波波高衰減的趨勢最大。
當波浪與系列潛堤交互作用所形成之布拉格共振，會將大量入射波浪反射於外海，在潛堤離岸側前形成駐波，使得垂直流速大於水平流速，並造成共振區水位抬升，抬升幅度最大可達入射波波高60%，此外共振區內之渦流因布拉格共振亦會有迅速消散的現象。向岸側之渦流特性，其渦度會隨著波浪週期的增加呈現遞增的趨勢，且在發生布拉格共振之試驗中，其渦度值則明顯地呈現迅速遞增的現象，所發展之渦流也會比其他未共振條件為大。

This thesis investigates the interaction between periodic waves and a series of submerged breakwaters under Bragg resonance of water waves. A total number of 8 artificial rectangular sand bars was place at the center of wave flume to produce Bragg scattering of water waves. The Particle Image Velocimetry (PIV) technique is employed to observe the simultaneous velocity field and the mechanism of vortex generation and dissipation in the vicinity of the breakwater for both resonant and non - resonant cases in a wave flume. Base on the experimental results, the decay ratio of wave energy increases gradually with the increase of the number of submerged breakwaters, especially in the resonant case. Meanwhile, the water surface elevations increase about 60% of incident wave height, and vortices decrease rapidly due to the standing wave forms at the weather side of the dike in the resonant case.

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