2008-01-112024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/681742摘要：本研究目的在探討颱風通過台灣地形與通過前後，其路徑及通過時間長短所產生的變化，利用目前所擁有的傳統和非傳統觀測資料，同時針對颱風本身的條件因子及環境因素，整合過去侵台颱風現有資料，希望了解颱風在經過台灣地形時所產生的動力機制及其物理特性，並建立概念模式，作為改進並提供颱風預報作業人員在實際作業的參考。在上年度已經完成近30年侵台颱風資料初步的整理與分析，並得到颱風通過台灣時，移行速度的特徵，本年度主要將依照去年度所得之成果進一步檢驗整理資料並設計數值實驗，進而建立概念模式。<br> Abstract: This proposal investigates the problem of typhoon landfall in Taiwan. Specifically, the weather characteristics in the period from 6 to 12 hour before the typhoon made landfall till typhoon leave Taiwan are to be studied. We will explore how the typhoon structure, size, strength, and the synoptic background may cause the variation in the wind and rainfall pattern and the length of duration period of typhoon landfall at Taiwan. We will use the meteorological data available to construct the climatology and use the shallow water model to explore the dynamics of track diffraction during the landfall. We hope to establish a conceptual model for the typhoon landfall forecast purpose. We have found, from the observations in the last 30 years, that the typhoon vortex drift speed increases as it approach the island of Taiwan. Moreover, there is a tendency of the typhoon track turned southward at some 50 -100 km before the landfall. If the landfall location is in the southern part of the east coast, the duration time of the typhoon in Taiwan is often in the time scale of 0-5 hr, which is with sharp contrast with that of 5-10 hr when the landfall location in the northern part of the east coast. A tentative explanation is that it is induced by the topographic beta effect (the topography induced stretching effect). In addition to the mean state discussed above, we have also found that the duration time of typhoon possessed great variability which required further study.侵台颱風颱風路徑偏折地形效應颱風移速typhoon translation speeddeflection of typhoon tracktopography effect