濁水溪是世界上含沙量最高的河川之一，颱風期間的尖峰流量可達 10,000 cms以上，並帶來大量的泥沙。由於北半球科氏力的影響，河流出流後會向右偏轉，形成一順時針的反氣旋結構(bulge)，而其中的部分河水則會繼續向北方移動形成沿岸海流(coastal current)，因此北半球的港口多建於主要河川出海口之左岸以避免淤積，然而在河川出海口南岸的麥寮港卻仍有淤積情況產生。因此本研究透過電腦數值模式Coupled-Ocean-Atmosphere-Wave-Sediment Transport (COAWST)，模擬雲林海域在河川與潮汐作用下，濁水溪口沿岸的輸砂情形，並搭配不同的情境模擬泥沙通量及餘流，以找出泥沙傳遞的動力來源。本研究計算從7月18日至7月28日共10天內，共有1728萬噸的泥沙從濁水溪河口向外海輸送，有209萬噸(12.08%)的泥沙會向北傳輸，2萬噸(0.12%)的泥沙向南傳輸，剩餘1517萬噸(87.8%)的泥砂則會停留在出海口內。而結果顯示，颱洪時期濁水溪泥沙出海後表層泥沙會受到科氏力造成的沿岸海流影響向北傳輸，並形成一個強勁的反氣旋結構，為表層帶來一強勁的南向流動，而在流量趨緩後，潮汐主導了底層泥沙的傳遞方向，離出海口約6至9公里處有一南向餘流，與底層泥沙濃度較大的位置相符合，因此濁水溪的沙源沉積後再懸浮，並隨著餘流移動，為造成泥沙南向傳輸的主要原因。

In this study, model results show that during typhoon, the surface sediment discharged by the Zhuoshui River is influenced by the coastal current and residual tidal transport within ten days from July 18th to July 28th, 17.28 million tons of sediment was transported from the Zhuoshui River mouth to the open sea. Out of this, 2.09 million tons (12.08%) moved northward, 0.02 million tons (0.12%) moved southward, and the remaining 15.17 million tons (87.8%) were retained within the river mouth. It is because during the high discharge condition, coastal currents generated at the right of the river mouth and an anti-cyclonic bulge caused flow converge and rapid deposition. After extreme weather conditions during low to moderate discharge conditions, residual circulations induce southward/shoreward transport.

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