納莉颱風登陸時的結構演化; Typhoon Nari's structure changs durung landing.

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题名:	納莉颱風登陸時的結構演化;Typhoon Nari's structure changs durung landing.
作者:	蔡雅婷;Ya-Ting Tsai
贡献者:	大氣物理研究所
关键词:	切向風;徑向風;tangential wind;radial wind
日期:	2006-06-02
上传时间:	2009-09-22 09:42:51 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究利用雙雷達風場合成和反演擾動壓力場，進而分析颱風風場在登陸期間結構的變化，瞭解颱風和地形間的交互作用，再藉由動量方程式的診斷分析，進一步了解颱風在登陸期間，造成颱風結構產生變化的原因。分析結果為：登陸時颱風風場具有不對稱的特徵，切向風場受到地形影響，會使原本傾斜的垂直結構變的較為直立，徑向風低層徑向入流會沿著地形增厚。中高層切向風場在雪山山脈附近，強風速區會有變寬的現象，由剖面得知此現象和垂直傳送有關，也造成切向風的非軸對稱特徵。中層徑向風場在山脈的附近有徑向外流極大值產生，中高層之徑向風場，在分析範圍北面風速值有隨時間增加而產生氣旋式平移的現象，由徑向風場弧狀剖面發現，徑向風低層為入流、中層為外流，而高層為入流和外流，低層徑向入流隨地形增加而明顯變厚。由動量方程收支發現，切向風風速值隨時間遞減，其中由近地層向上傳送因地面摩擦之較低切向風的垂直傳送十分重要；垂直傳送項對低層入流增厚有相當程度的貢獻。 In order to understand the relationship between the typhoon and topography this study utilize dual-doppler radar synthesis to compose three-dimensional wind and retrieval the perturbation pressure field, mechanisms of the structures change during typhoon landing. The analysis results are typhoon wind field was asymmetric during landfall. Influenced by the topography the titled maximum tangential wind over the ocean side becomes more vertically over the terrain. Low level inflow also becomes thicker over land. Near the Snow Mountains the tangential wind strong wind speed district becomes wider on the middle and high level. This phenomenon is caused by the vertical transport and subsequently induces tangential wind asymmetry. The outflow maximum appears near the mountain on the middle level. From analysis the momentum budget equation, we found the tangential wind decrease with time, is major due to the low level upwards transport of the smaller tangential wind. And the vertical transport term also is important to the low level radial inflow becomes thicker over the terrain.
显示于类别:	[大氣物理研究所 ] 博碩士論文

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