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Student Number 986201013
Author I-Hsin Wu(吳乙昕)
Author's Email Address No Public.
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Department Graduate Institute of Atmospheric Physics
Year 2011
Semester 1
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Typhoon Fanapi (2010) Investigate mechanism of rainfall
Date of Defense 2011-12-28
Page Count 89
Keyword
  • ocean mixed-layer model
  • tropical cyclone bogus scheme
  • Abstract This study used the Weather Research and Forecasting (WRF) Model to simulate Typhoon Fanapi (2010), and investigated the mechanisms of the torrential rainfall in south Taiwan and near the coastal Kaohsiung. In this study, FORMOSAT-3/COSMIC GPS RO、GTS and DOTSTAR dropsonde data were assimilated to improve the model initial conditions. An ocean mixed layer was also employed during the model integration to allow the ocean mixed-layer feedback to modulate sea surface temperature.
     By using a tropical-cyclone bogus method, the model results show that the simulated typhoon’s intensity is closer to the observations. However, the track becomes deflected somewhat northward after landfall in Taiwan causing degraded rainfall prediction as compared to the control experiment which matches the observed quite well. Assimilation with the above observational data appears to have no major impact on track prediction. When the typhoon is approaching and passing over Taiwan, its intense circulation interacts with the Central Mountain Range (CMR), leading to the major rainfall production right over the steep slopes. As the typhoon is moving away from south Taiwan, the vigorous rainband is produced near the coastal plains of Kaohsiung, thus appearing as a separation of intense rainfall. It was found that reducing the environmental moisture southwest of Taiwan doesn’t contribute to a noticeable impact on the above rainfall rate, while the rainfall intensity becomes significantly weakened as the environmental moisture southeast of Taiwan has been cut down by half. Finally, the terrain sensitivity experiments indicate that Taiwan terrain height plays an important role in intensity as well as distribution of the rainfall in Taiwan. The double rain bands are no longer existent and become united as the CMR height is reduced by 75%.
    Table of Content 中文摘要.....................................I
    英文摘要.....................................II
    致謝 .....................................III
    目錄 .....................................IV
    圖表目錄.....................................IV
    第一章 緒論 .....................................1
    1-1前言 .....................................1
    1-2文獻回顧 .....................................1
    1-3研究動機.....................................3
    第二章 個案介紹 .....................................5
    第三章 研究工具與方法 .....................................7
    3-1 模式介紹 .....................................7
    3-1-1 WRF 模式介紹 .....................................7
    3-1-2 WRF TC-bogus方法 .....................................8
    3-1-3 WRF海洋混和層模式 .....................................9
    3-2 資料來源 .....................................10
    3-3 模式設定 .....................................12
    3-4 實驗設計 .....................................13
    3-4-1 WRF TC bogus實驗 .....................................13
    3-4-2水氣敏感度測試 .....................................13
    3-4-3 地形敏感度測試 .....................................14
    3-5 公正預兆得分 .....................................14
    第四章 模擬實驗結果分析 .....................................15
    4-1 控制實驗 .....................................15
    4-2 TC bogus實驗.....................................18
    第五章 敏感度實驗 .....................................19
    5-1 水氣敏感度實驗結果與分析.....................................20
    5-2 地形敏感度實驗結果與分析.....................................21
    第六章 結論與未來工作 .....................................24
    參考文獻.....................................26
    附表與附圖 .....................................28
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    李志昕,2009:西北向侵台颱風登陸前中心路徑打轉之模擬研究。國立中央大學,大氣物理研究所,碩士論文,82頁。
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    Willoughby, H. E., F. D. Marks, Jr., and R. J. Feinberg, 1984:Stationary and moving convective bands in hurricanes. J. Atoms Sci. ,41 ,3189-3211.
    Chien, F. -C., and H. -C. Kuo, 2011:On the extreme rainfall of Typhoon Morakot (2009), J. Geophys. Res., 166, D05104, doi:10.1029/2010JD015092.
    Jain, G. –J., and C. –C., Wu, 2008:A Numerical study of the track deflection of super-typhoon Haitang(2005) prior to its landfall in Taiwan. Mon. Wea. Rev., 136 598-615.
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    of landfalling hurricanes with the Advanced Hurricane WRF model. Mon. Wea. Rev., 136
    , 1990-2005.
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    Advisor
  • Ching-Yuang Huang(黃清勇)
  • Files
  • 986201013.pdf
  • approve immediately
    Date of Submission 2012-01-19

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