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題 名 | 臺中港海域的風驅流=The Wind Driven Current at the Vicinity of Taichung Harbor at Taiwan |
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作 者 | 王玉懷; 曾相茂; | 書刊名 | 港灣技術 |
卷 期 | 14 1999.06[民88.06] |
頁 次 | 頁1-15 |
分類號 | 328.5 |
關鍵詞 | 風驅流; 東北季風; 臺灣海峽; Wind driven currents; Northeast monsoon; Taiwan strait; |
語 文 | 中文(Chinese) |
中文摘要 | 風驅流(Wind Driven Current,或稱風吹流)在近岸海洋動力學上扮演著一個相當重要的角色。例如風驅流對沿岸水文流場,沿岸漂沙及地形變遷等有決定性的影響;另外船舶航行及海上作業等也會受到風驅流的影響。風驅流顧名思義是因風吹於海面形成之剪應力驅使海水之流動,台中港位於台灣海峽中部,在冬季東北季風(Northeast Monsoon)盛行時,曾多次觀測到強勁的風驅流(梁乃匡、曾相茂,1982;曾相茂,1995)。為求對風驅流有進一步之了解,本文借由台中港域附近之風場及海流的實測資料進行分析探討。由四個風力測站資料分析結果顯示台中港區各站之實測風速大小及風向變化十分相似;冬季平均風速約5~8m/s,風向為北至東北風,冬季鋒面過境時,常可見15m/s以上之強風連續吹襲數日;夏季之風力較弱,平均風速約1~3m/s,主要為西南季風。三個海流測站之海流分析結果顯示冬季鋒面過境時可出現3至7天週期的風驅流,流速約1~2節,主要流向受地形導流而平行於海岸線,迴歸分析顯示風驅流之流速與風速的平方有良好的相關,流速大約為風速的5~7%,此值比文獻記載的1.5-3%高,其解釋原因是風吹流受沿岸水深地形導流之效應及波浪衍生之沿岸流加強的結果。 |
英文摘要 | The wind-driven currents always play an important role in the coastal hydrodynamics. For example, wind driven currents may change the coastal current regimes, increase the near shore sediment transport and even endanger the safety of navigation. Being locating at the middle of Taiwan Strait, the vicinity of Taichung Harbor receives strong northeast monsoon in the winter season. The resultant wind driven current is quite strong which has been observed frequently. To quantify this current, data collected from 4 wind stations and 3 current meter stations are examined. The results show that the mean wind speed is about 5-8 m/s in winter and less than 3 m/s in summer, the wind direction is from the northeast and the southwest respectively. The gust wind speeds can reach 15m/s or higher and last for days in the winter. The analysis of current data suggests that there are 3 to 7 days periodic fluctuations which are in phase with the passage of winter cold fronts. The mean current speed is about 1 to 2 knots and its direction in parallel with the coastal line. Regression analysis shows that the magnitude of wind driven current is about 5 to 7% of the wind speed. This magnitude is higher than wind induced currents in the open ocean (1.5-3%) as reported in literatures. The strong current is explained due to the enhancement of wave induced along shore current plus the effect of coastal geometry. |
本系統中英文摘要資訊取自各篇刊載內容。