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中文摘要：
利用中尺度数值模式,WRF对2005年7月19—20日台风＂海棠＂登陆前后具有非对称性结构的螺旋雨带的结构特征进行数值模拟和分析。结果表明,降水中心所处的两条雨带位于台风中心东北象限,其南雨带的移动和强度变化与850 hPa正的涡度带在19日02—18时（世界时,下同）都有较好的对应关系。台风流场的逆时针旋转作用将海上850 hPa正的涡量大值带逐渐与南雨带合并,造成南部雨量中心的雨量增幅。南雨带北移逐渐与北雨带合并,造成北部雨量中心的雨量增幅。另外,分析暴雨的发展与高低层垂直切变风的高层辐散流场有关;最后讨论了雨量中心附近区域低层对流涡度矢量（CVV）垂直分量的发展条件及其与降水的关系。
英文摘要：
In this paper,a numerical simulation and diagnostic analysis of the structure and characteristics of asymmetrical spiral rain bands around Typhoon Haitang during the period of 19 to 20 July are carried out by using the WRF mesoscale model.The result indicates as follows.The rainbands associated with the two centers of precipitation are mainly located in the northeast of the typhoon center.The movement intensity of the southern rain band is well related to a 850 hPa positive vorticity band during 0200—1800 UTC 19 July 2005.The combination of the positive vorticity band at 850hPa and the southern rain band with the aid of cyclonic circulation leads to the growth of rainfall at the southern center of precipitation.The mergence of the southern and northern rain bands gradually increases the strength of rainfall near the northern center.In addition,we analyze the relationship between the heavy rainfall and the divergence field of vertical shear wind.Finally,the relationship is revealed between the development of convective vorticity vector（CVV） and rainfall near the two centers of precipitation.
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