臺灣四周擁有豐富的海洋資源，早期漁業捕撈業的興盛使得漁港數量多，然而港口結構物可能破壞海岸沉積物運移的平衡，造成海岸線侵蝕或淤積現象。本研究以安平港的興建為例，探討其對臨近之黃金海岸的影響，並分析假設拆港後對水動力及海岸地形變遷之影響。本研究利用地表水模擬系統(Surface-Water Modeling System, SMS)中的水動力模式(CMS-Wave和CMS-Flow)，以夏、冬兩季代表事件模擬臺南安平港口拆除前後，當地沿岸的水動力變化及地形變遷機制，同時利用漂砂模式(PTM)分析二仁溪河口漂砂的運移軌跡。
研究結果顯示，拆港後，在距離原港口1 km範圍內的波高有顯著的變化；平均流速在拆港後於原港口南側2.5 km範圍內亦有明顯差異，尤其在原港口防波堤附近影響最大，隨距離港口越遠影響程度越小，安平港拆除後，由於距離關係，至黃金海岸段的水動力變化已不明顯。地形變遷方面，港口拆除前後主要影響地形侵淤趨勢的位置在距離港口南邊1 km範圍內，在港口拆除前，夏季有淤積趨勢，冬季則無明顯侵淤變化；港口拆除後，夏季的堆積趨勢減小，甚至出現侵蝕現象，而冬季則因少了防波堤的屏蔽效應，開始有明顯的侵淤變化，造成這些現象係由於兩季的代表波浪與沿岸結構物的交互作用，使得帶動沿岸漂砂的水動力不同而導致。
本研究亦模擬了二仁溪河口輸砂之漂砂軌跡，本研究區域無論是夏冬兩季漂沙趨勢是緩慢向北移動，本研究認為波浪方向是造成兩季節漂砂沉積結果不同的主要原因，夏季波向多來自西南方，波浪與潮流作用後使漂沙多堆積於河口北側；冬季波向多來自西北方，使得漂砂自河口出流後多堆積於河口南側。

The coastal structures protect the wave attack, but it may break the sediment transport cycle and retreat of the coastline. This study takes the removal of Anping Harbor as an example to explore its impact on the Golden Coast, and analyzes the impact of hydrodynamic and morphodynamic changes due to the sea harbor removal. In this article, the CMS model in the Surface-Water Modeling System (SMS) was used to simulate the hydrodynamic and morphodynamic changes on the representative events of summer and winter. And the Particle Tracking Model (PTM) was also applied to simulate the movement trajectory of the drift sand in the Errenxi River estuary.
The simulation results show that after removed the harbor, the wave height has a significant change within 1 km from the coast, and the average current velocity is also significantly different within 2.5 km south of the harbor, especially near the harbor’s breakwater. The hydrodynamic changes to the Golden Coast section are no longer significant. In terms of morphodynamic changes, the location that mainly affects erosion or deposition before and after harbor removal is within 1 km from the south of the harbor. Before the harbor removed, there is a deposit in summer. After the harbor is removed, the location experiences erosion in summer. Due to the lack of the shielding effect of the breakwater, there is obvious changes in invasion and deposit in winter. These phenomena are caused by the interaction between the waves and coastal structures, which makes the hydrodynamic forces that drive the coastal drift sand different.
This article also simulated the trajectory of sand transport in the Errenxi River estuary. In the study area, the trend of drifting sand is slowly moving northward. The direction of the waves is the mainly factor caused the drift sand deposition in summer and winter.

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