9711号台风暴雨的诊断分析与数值试验

Diagnostic Analysis and Numerical Experiments of No.9711 Typhoon with Its Torrential Rainfall

采用诊断分析和数值试验的方法 ,分析了 971 1号台风登陆后的演变过程 ,讨论了水汽、地形等因子对台风及其降水的影响。诊断分析表明 ,理查逊数对降水落区具有一定的指示性 ,- 1 <Ri<0的强对流和湍流发展区与降水分布区域较一致。数值试验表明 ,水汽是台风及其降水加强和减弱的一个制约因子 ,水汽含量减少到一定程度的台风过程可视为干台风过程 ;

Diagnostic analysis and numerical experiments were performed in this paper for the evolution of No.9711 Typhoon landed at Zhejiang province,and the forming cause of its torrential rainfall was analyzed.The results show that water vapor is a decisive factor of typhoons rainfall.Topography acts an important role in the development of typhoon process and its rainfall.Moreover,the R i number could show the potential area of the torrential rainfall to a certain degree.