本文首先由前人研究本地區海岸變遷之文獻資料，並蒐集各學術研究單位對本地區附近有關氣象、海象、地象等基本資料，來探討造成雙春海岸線侵蝕變化之原因，並利用成大水工所研擬以三座離岸潛堤，並配合打樁編籬，抽砂養灘之工法，做雙春海岸之侵蝕防治工法。
　　為了解此工法施工後對本地區之海岸之變遷影響，本文即以數值方法分析興建離岸潛堤興建前後，波流場之變化。由波、流場圖可發現，建堤後無論波場或流場，波高及流速均顯著降低，所以離岸潛堤之興建，基本上還是有達到消減波浪能量之功能，避免海岸繼續侵蝕。惟海岸結構物之興建對上下游之海岸穩定均會發生影響，所以該工程施工後後續觀測工作，必須繼續進行。

　　This study explores the major factors leading to coastal erosion at Shuang-Chun coast in Tainan County, and it has collected previous researches on coastal changes as well as the field data of wave climate reported by related units in this region for reference. The protection program for erosion includes installation of three offshore submerge breakwaters, piling, fencing, beach nourishment suggested by Tainan Hydraulics Laboratory, NCKU.
　　Numerical models are applied to analyze the changes of wave field and nearshore current field after the construction of offshore submerge breakwater, so the effect of the program can be evaluated. Results reveal the obvious decrease in wave field, nearshore current field after the construction. Therefore, the mitigation of beach erosion can be achieved due to the protection. As the instability of upstream and downstream beach will be caused by coastal structure’s intervention, successive survey should be followed in the future.

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