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題 名 | 臺灣地區八十三年至八十六年颱風暴潮特性之初步研究=A Preliminary Study of Characteristics of Typhoon Surges in Taiwan for the Years 1994-1997 |
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作 者 | 徐月娟; 曾淑芬; 陳進益; 蔡恆雄; | 書刊名 | 氣象學報 |
卷 期 | 42:3 1998.09[民87.09] |
頁 次 | 頁230-247 |
分類號 | 328.55 |
關鍵詞 | 颱風暴潮特性; 暴潮偏差; 分類; 調和分析; 天文潮; 海岸災害; Characteristics of the typhoon surge; Typhoon surge deviation; Classification; Harmonic analysis; Astronomical tide; And coastal disaster; |
語 文 | 中文(Chinese) |
中文摘要 | 臺灣地區颱風暴潮有其地域特性,欲防範因颱風引起暴潮的侵害,需分析和了解 不同路徑、大小和強度的颱風在臺灣各處海岸可能造成的異常水位上升現象。本文使用民國 83 年至 86 年臺灣海岸各潮位站的海水位觀測資料,經過初步品管檢定後, 選擇其中資料 較完整的時段,以調和分析方法計算各分潮的振幅和遲角,再用來推算在颱風期間的逐時天 文潮位,然後與同時間的水位紀錄相減,而得到估算的暴潮偏差,並根據此偏差值討論暴潮 的特性及成因。 氣象界慣用的 7 種侵臺颱風路徑分類,係以陸地災害為主,對海岸災害而 言並不夠用。然而從臺灣外海經過的颱風,雖未登陸,其在本省東北部、東部和西南部海岸 引起的暴潮偏差卻不容忽視。 本文將中央氣象局最近 4 年曾發布警報的颱風,選擇其中對 臺灣沿海地區海水位變化影響較大的 18 個颱風,提出一套依據颱風生成地點和路徑的分類 法,探討各類型颱風在臺灣海岸引起海水位升高的現象和特性,分析造成暴潮偏差的原因, 研究其與颱風特性的相關性。由於這四年的個案有限,本文僅做初步的定性敘述。颱風暴潮 偏差受颱風大小、強度、路徑和移動速度,以及當地地形、水深和天文潮位而異,與颱風中 心附近的倒轉氣壓計效應,向岸或離岸強風吹襲的風揚作用,以及颱風波浪和湧浪在岸區碎 波的波揚作用有密切關係。臺灣地區天文潮差很大,颱風暴潮引起災害的程度與當時之天文 潮高有關。本文研究結果可作為颱風暴潮預報作業的參考,以及提供暴潮數值模擬結果驗證 之用。 |
英文摘要 | Typhoon surges have local characteristics in Taiwan. To minimize damage caused by typhoon surges requires the analyses and understanding of the abnormally high water levels around the Taiwan coast due to typhoons of various tracks, sizes and intensities. We use tidal gauge data around the Taiwan coast for the year 1994-1997, which are checked by a primary data quality control procedure. We perform harmonic analyses on selected integral data periods to determine amplitudes and phase lags of tidal components for each tidal station. Accordingly, we calculate the astronomical tide in typhoon periods. Typhoon surge deviations are estimated from the difference of the observed data and the computed astronomical tide. Accordingly, we discuss the characteristics and causes of typhoon surges. The classification of 7 typhoon tracks used in meteorology was mainly based on continental disasters. This might not be suitable for coastal disasters since typhoons passing by near shore of Taiwan could cause disasters on the northeast, east, or southwest coasts although they never land. We analyze 18 typhoons warned by the Central Weather Bureau in the past 4 years which affected the Taiwan coast more apparently, and then present a classification method based on the formation location and track of typhoon to study the phenomena and characteristics of the typhoon surge. The typhoon surge is related to the size, intensity, track and moving speed of a typhoon, the local coastal shape, water depth, and the astronomical tide, the inverted barometer effect, onshore wind setup, and the breaking wave setup. Because the tide difference is significant in Taiwan coast, the seriousness of damage is closely related to the astronomical tide level at that time. The results of this study will be helpful for the routine work of typhoon surge prediction, and for the evaluation of numerical simulation. |
本系統中英文摘要資訊取自各篇刊載內容。