台风“飞燕”登陆前后的运动特征

Analysis of Movement Characteristic for Typhoon ″Chebi″ Approaching and Landing

通过对 2 0 0 1年台风“飞燕”登陆前的雷达回波和地面加密观测资料的分析表明 :兴化湾地形作用使微型小台风近海突然加速折向兴化湾移动 ,微型小台风在临近登陆时风速将出现跳跃突变 ,其隐蔽性的灾害特征突出。指出制作微型小台风登陆前风速的定时定量预报的必要性。

With the help of radar data and surface intensive observations before typhoon Chebi landed over Fuqing,Fujian,in June of 2001,the movement features of a tiny typhoon Chebi are investigated.It is shown that the topographic forcing of the Xinghua Bay made typhoon Chebi suddenly move to the Xinghua Bay at great speed when it was approaching and landing. It is found that its potential disaster characteristic is significant,as a result of the wind speed jumply changes.Consequently,it is very necessary to make quantitively the wind speed forecast in time when a tiny typhoon is approaching and landing.