颱風侵襲時臺灣海島對風場分析與預報之影響

王時鼎 林則銘 俞家忠

空軍氣象中心

ABSTRACT

　　The problem of wind field of Typhoons affecting Taiwan may be considered and treated as one of the viscous rotating fluid past an immersed body-the Central Mountain Range. It is noted that the phenomena occurred in the boundary layer of a viscous fluid, such as flow separation, vortex, and wake zone are all acturally to be found in Taiwan during Typhoon invasions. Besides, the Proudman-Taylor theorem for the rotating fluid and the dynamic effects of large-scale flow passing over a barrier can also be applied to these situations. Generally, the features of flow field in this region can be well explained by the theories mentioned above. Some observational evidences are presented and the applications in wind forecasting are discussed.