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頁籤選單縮合
題 名 | 臺灣七大商港海域之潮流橢圓特性=Investigating the Characters of Tidal Current Ellipses on the 7 Major Ports around Taiwan |
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作 者 | 莊文傑; 張憲國; 曾相茂; | 書刊名 | 海洋工程學刊 |
卷 期 | 14:3 2014.09[民103.09] |
頁 次 | 頁177-200 |
分類號 | 351.9719 |
關鍵詞 | 潮流分析; 潮流橢圓; 同潮圖; 無潮點; 凱文波; 臺灣海域; Tidal currents analysis; Current ellipse; Co-tidal chart; Amphidromics; Kelvin waves; Seas around Taiwan; |
語 文 | 中文(Chinese) |
中文摘要 | 針對臺北、臺中、安平、高雄、花蓮、蘇澳、及基隆等臺灣七個主要商港外廓海域2009年至2010年的實測海流資料,本研究先進行各港天文潮流之調和分析,並建立調和分析常數與分潮流橢圓特徵之直接關聯性,從而可判定各港主要之M2分潮流橢圓,其型態普遍皆趨向於扁平,而且除了臺北港與花蓮港之分潮流橢圓旋轉方向為逆時針外,其他各港均為順時針。造成各港M2分潮流橢圓扁平度與旋轉方向存在變異的原因,經依循Carbajal(2000, 2004)之判定準則,並引介臺灣近海迄今可得之同潮圖作綜合檢視對照後,可確認其與M2分潮同潮圖在局部海域所展現之潮波傳播特性關聯密切。在局部海域,尤其當分潮波同潮圖之同振幅線及同潮時線之平面梯度向量∇lnζ相對∇ψ之逆時針方向交角χ,滿足0≤χ≤π,或具有順沿波動行進方向右側水位高於左側之行進凱文波特性,則所對應分潮流橢圓之旋轉方向,將明確展現為逆時針;其他情況,諸如:潮波具有順沿波動行進方向左側水位高於右側之特性、或鄰近無潮點、或同振幅線稀疏、或同潮時線密集,則分潮流橢圓之旋轉方向,皆應展現為順時針。 |
英文摘要 | There are 7 major ports: Taipei (TP), Taichung (TC), Anping (AP), Kaohsiung (KH), Hualien (HL), Suao (SA) and Keelung (KL), locate around the coasts of Taiwan. Basing on the records of coastal currents that measured at each port during 2009 to 2010, the harmonic analyses are respectively implemented, and the characteristics of the top 4 constituents that presented by current ellipses are investigated. By the most significant constituent M2 that exhibited at each port, the flatness of the current ellipse consistently tends to be flat. The rotation sense appears to be clockwise at most of the ports, besides at ports of TP and HL where counterclockwise sense exhibited. Applying the criteria proposed by Carbajal (2000, 2004) to examine and insight the main mechanism that cause different rotationsense, it is verified and confirmed that on the co-tidal charts of a coastal sea, i.e., on the tidal amphidromics system, while the angle (χ) between the gradients of the logarithm sea-surface elevation (∇lnζ) and phase (∇ψ) that measured in counterclockwise sense satisfied 0≤χ≤π, or equally the locally tidal waves presented the features of progressive Kelvin waves, then the rotation sense should be counterclockwise. Otherwise, such as nearby the amphidromics, sparse of co-amplitude lines, and dense of co-tidal lines, the rotation of a current ellipse must be in clockwise sense. |
本系統中英文摘要資訊取自各篇刊載內容。