本研究主要針對雲林海域之水動力與泥砂傳輸進行研究，蒐集該區域相關背景資料，亦建置雲林海域之數值模式，採適用於模擬近岸及河口地區之波浪、潮流、近岸流、漂砂和地形變遷的NearCoM-TVD近岸模式系統以進行模擬評估，並使用潮位測站與都卜勒流速剖面儀所量測到之流速資料驗證模式之正確性。測站與模擬之潮位及流速的率定結果顯示，其潮流相位、週期及振幅的模擬和觀測值都有良好的一致性，因此本研究模擬的結果可用以討論此模擬區域的流場及輸沙特性。根據模擬結果，在波浪及潮流共同作用下，麥寮港航道南側之淺灘呈現朝向航道移動之趨勢，代表航道淤積的現象。模式結果顯示，波浪造成由北向南流動之沿岸流亦可能會將北面的砂源向南運送，在不考慮潮流影響下，此沿岸流之淨量值即可達到0.3m/s，若再加上潮流交互影響下，會導致沿岸流增強，其中北面之砂源也包含了來自濁水溪出海口之高濃度沉積物，而這些沉積物會隨著港口附近之流速減緩，容易在此處沉降。

The mechanisms controlling sediment transport are complicated due to the interaction among waves, tidal currents, river flow over complex bathymetry. The goal of this study is to clarify the contribution of exposed riverine sediment and hydrodynamics to the observed morphological evolution in the adjacent area. NearCoM-TVD, couples SWAN and SHORECIRC, reproduced water levels, waves, currents observed along the sandy coasts reasonably well. Model results were used to provide insights into the patterns of flow residual for a range of riverine discharge, spring-neap tidal forcing, and wave conditions. Simulation results reveal that tidal currents play an important role in net transport northward during normal conditions, and wave-driven longshore currents also transported significant amount of sediment from the mouth of the Choushui River during northeast monsoon season. Model result shows that the installation of submerged vegetation could be one of engineering means to modify the circulation system nearby port to mitigate the siltation problem. Model results with submerged aquatic vegetation (SAV) installing in the southern Mailiao Port demonstrate that SAV plays a prominent role in blocking sediment from entering the navigation channel or port basin.

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