高雄港係由旗津沙洲所形成之天然港，近年來旗津海岸遭多次颱風受作下，已造成海岸嚴重侵蝕及掏空。海岸保護也成為現今海岸工程重要的課題，其施作工法眾多，為達到環境平衡及海岸保護效果，欲以海面下設置離岸潛堤構造物工法為探討標的。
潛堤為突出海底潛沒於水面下之結構物，可由形狀使入射波產生碎波、分裂、滲透、反射或折射等行為，為達到潛堤阻斷海流斷面效果，藉以延長海岸保護功能與加強安定性，應需瞭解潛堤沈陷量大小。本文中針對沈陷量採用數值方式擬模，並與前人分析結果之比較，以瞭解潛堤沈陷行為。

The Kaohsiung harbor, surrounded by the Chijin sandbar, is a natural harbor. In recent years the Chijin seacoast has suffered many typhoon attacks, causing serious corrosion and ground depression. Coastal engineering becomes one of the important issues of coastal protection. There are a lot of methods to reach an environmental balance and to protect the coast effectively. The purpose of this study is to evaluate the method of building offshore structures-submerged breakwater construction.
The submerged breakwater construction bulges from the seabed but seats underwater surface. To block the ocean current cross section effect, the contruction makes the incident waves break, split, penetrate, reflect or refract. Understanding the scale of submerged breakwater’s subsidence is important. The stability of coastal protection is need to be extended and strengthen. In this study, the numerical method is used to simulate the settlement, following by analyses and comparison to previous research results, leading to better understand of the behavior of submerged breakwater settlement.

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