颱風環流結構對於颱風路徑與強度的模擬十分重要，同時對於風雨分佈診斷亦有絕佳的助益，在臺灣都卜勒雷達網連架設後，使用單都卜勒雷達反演颱風環流十分值得探討。本文首先利用不同理想風場測試以單都卜勒雷達資料估算颱風環流之GBVTD (Ground-Based Velocity Track Display)方法，藉以瞭解GBVTD反演颱風環流的準確性及誤差來源，此結果顯示若忽略掉颱風徑向風非軸對稱項的值越高，反演出的結果越失真。本文亦使用中正機場雷達與五分山氣象雷達資料，運用RASTA (Radar Analysis System for Taiwan Area)技術對登陸的納莉颱風做雙雷達風場之合成分析，並加以驗證GBVTD方法在颱風登陸後反演之適用性與準確性。 為了瞭解納莉颱風在登陸前及登陸後的結構，本文使用五分山氣氣雷達資料，在納莉颱風登陸前，運用GBVTD方法反演納莉颱風之水平分層的軸對稱切向風與徑向風，以及非軸對稱切向風，可由結果分析納莉颱風登陸前的回波風場三維結構之隨時間變化；納莉風登陸後，藉由雙雷達合成後所得之水平分層的風場，分析納莉颱風登陸後風場的垂直結構與特性。 研究結果顯示，在網莉颱風登陸前GBVTD反演的颱風軸對稱最強切向風，隨高度向外傾斜，且包含非軸對稱項之最大切向風亦出現在強回波附近，最強切向風半徑收縮時，風速亦有增強的情形，顯示GBVTD在外海可以反演出成熟颱風的結構；登陸後，雙雷達合成風場顯示有較強非軸對稱徑向風分量，GBVTD反演結果較難得到正確的風場結構。

The typhoon circulation structure is very important in simulation of typhoon track and intensity. The more realistic structure can also improve the diagnosis of the distribution of wind and rainfall. Since the installation of Doppler Radar Observation network in Taiwan, it is very necessary to retrieve typhoon circulation by using single Doopler radar. This research used different ideal wind fields to test the Ground-Based Velocity Track Display (GBVTD) technique. At first, the higher value of asymmetric radial wind of typhoon which was neglected in GBVTD method, the more distortion of retrieved wind structure will occur. Before and after the landfall of typhoon Nari, the GBVTD retrieval of wind structures were carried out for five time stages. Before landing, the axisymmetric tangential wind maximum were titled outward, the strongest tangential wind located near the strongest echo area. While the radius of maximum wind was contracting, the maximum tangential wind also increasing. These phenomena were very similar to the documented mature typhoon structure, indicating the GBVTD retrieval was able to reveal the typhoon structure over the open ocean in Nari’s case. After landing, the dual Doppler synthesis 3-D wind fields were carried out by RASTA (Radar analysis System for Taiwan Area) method using CKS and RCWF Doppler radar data. The GBVTD retrieved wind fields were compared to the dual-Doppler wind, we found the higher asymmetric radial wind component did cause some error in GBVTD retrieved wind structure. The high terrain may be the reason of the higher value of asymmetric component.