Effect of the Orography of Taiwan Island on Typhoon Tracks
台湾岛地形对台风移动路径的作用

In order to investigate the effect of the orography of Taiwan island on typhoon tracks, nine numerical experiments are performed using the barotropical vorticity equation with the orographic term. The grid point values of the initial fields are obtained from the dense data of SPECTRUM and TCM-90 Field Experiment by an interpolation method. Results show that the tracks of the model typhoon deviate towards the polar side because of the effect of the orography and that the asymmetric structure has been changed. The positions of the maximum velocities have been shifted towards the typhoon center after introducing the orography, which may be a possible cause for right deviation of the tracks.