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題 名 | 臺南與高屏沿岸表層流況及水平擴散之觀測=Observations of Surface Currents and Horizontal Diffusion in Coastal Waters of Tainan, Kaohsiung and Pingtung |
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作 者 | 曾若玄; 許國榮; 廖克恒; | 書刊名 | 中國土木水利工程學刊 |
卷 期 | 10:1 1998.03[民87.03] |
頁 次 | 頁69-78 |
分類號 | 443 |
關鍵詞 | 浮標; 延散; 擴散係數; 長度尺度; Drifter; Dispersion; Eddy diffusivity; Length scale; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係在臺南曾文溪口及高屏附近海域進行數次的浮標群飄流擴散實驗,浮 標定位方式有AROOS/GPS及航海霤逢兩種,以瞭解此海域的表層流況與水平擴散特性。調 查結果顯示,曾文溪口近岸海域的浮標軌跡、流速、速度自相關係數等均與潮汐的關係密 切,而高屏外海的浮標飄流型態則與潮汐的關連較少,但是呈現明顯的季節性的差異,而 且積分時間尺度、渦流長度尺度與擴散係數等均大於曾文溪口近岸海域之值,在某一個長 度尺度以上時.浮標群的雕散便快速增加,所推算的延散係數與擴散係數均隨著長度尺度 的增加而漸大,而且大致符合傳統的4/3次方擴散定律,此外本文並探討流場運動性質輿 水深變化的關係。 |
英文摘要 | Experiments of drifter cluster dispersion were conducted in the Tseng-wen estuarine waters near Tainan and coastal waters off Kaohsiung and Pingtung. Two techniques of drifter positioning were used, i.e., ARGOS/GPS and shipborne radar. This study is aimed to better understand surface currents and horizontal diffusion of the studied sites. The results indicate that in Tseng-wen estuaries, drifter trajectories, velocities and autocorrelation functions are closely related to tidal conditions. Drifter trajectories in Kaohsiung and Pingtung offshore waters show strong seasonal variations but less connections with tides. The integral time scale, length scale and eddy diffusivities at Kaohsiung and Pingtung offshore waters are greater than those of Tseng-wen estuaries. At these two sites there exists a certain length scale, and the drifters dispersed more rapidly beyond this length scale. The estimated dispersion coefficients and eddy diffusivities appear to increase with the increasing length scale and follow the traditional four-thirds scale law. Furthermore, relationships, between differential kinematic properties of flow fields and local water depths were also discussed. |
本系統中英文摘要資訊取自各篇刊載內容。