莫蘭蒂(Meranti)颱風於2016年9月13日至15日影響臺灣，雖並未登陸臺灣，但其行經巴士海峽期間，於臺灣東部迎風面與屏東地區降下豪雨，造成嚴重水災與山區道路損毀；且在進入臺灣海峽後，因受到東南方對流雲系影響，仍持續在台東地區造成豪雨。本研究應用Nguyen and Chen (2011) 颱風初始化方法，以WRF模式模擬莫蘭蒂颱風個案，探討東部迎風面的降水機制，並針對後期的台東豪雨事件進行討論。此外，為瞭解臺灣地形與雷伊颱風對莫蘭蒂颱風之影響，以及同化雷達資料可否對模擬之降雨有所改善，本研究也進行敏感度實驗和雷達資料同化實驗。
模擬結果顯示，第一波降雨期間，環流與地形效應在對流發展與降水扮演重要角色；第二波降水期間，東部外海的氣流輻合與傳輸造成台東豪雨事件 。敏感度實驗結果顯示，臺灣地形高度會影響莫蘭蒂環流結構、路徑與迎風面的降水量；而地形阻擋效應、環流結構不對稱以及雷伊颱風皆是影響莫蘭蒂路徑的因素。雷達資料同化實驗使用3DVAR資料同化法，結果顯示同化雷達回波(包含徑向風與回波)或傳統資料因可修正颱風雨帶位置，使同化後0-12h的降雨預報獲得改善，因而對第一波降水有較佳的模擬。

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