摘要：本研究旨在提高台风强降水预报准确率，以减少台风暴雨造成的农业损失，为防灾减灾工作提供决策依据。本研究利用NCEP 1°×1°再分析资料、区域自动站实况观测资料，并结合浙江省地形特征，主要从台风路径、与降水相关的物理量场、近地层辐合和地形作用等方面分析“苏迪罗”在浙江形成强降水的成因。通过分析发现，台风路径与形势场的相互作用密不可分，“苏迪罗”登陆前长时间维持西北向移动主要是由于副高稳定维持；此外正涡度场轴线也在一定程度上指示台风未来走向。通过分析强降水与各物理量场关系可得出以下结论：（1）台风暴雨多处于东南急流与山地迎风坡相交汇的地区。（2）强降水区与水汽通量辐合区、比湿大值区、正涡度大值区和假相当位温的“双峰结构”有一定的对应关系，此外近地层辐合系统的长时间维持、台州东低西高山脉地形和局地喇叭口状地形是局地产生超强降水的重要条件。

[Abstract]The paper aims to improve typhoon torrential forecast accuracy, reduce agricultural losses caused by typhoon rainstorm,and provide decision basis for disaster prevention and reduction.Using NCEP 6-hourly reanalysis data with resolution 1°×1°, regional automatic weather station live observation data and combined with terrain features ,the authors analyzed the causes of heavy rainfall in Zhejiang by “Soudelor” from typhoon track,physical field which are related to heavy rainfall,near the surface layer of the convergence and the effect of terrain.The results shows that The interaction between the typhoon track and the large scale circulation is closely related.Further,the positive vorticity field axis also indicates the future trend of the typhoon to some extent.In this case,”Soudelor” had a long time maintenance to moving northwest before landing is mainly due to the stability of the subtropical high.By analyzing the relationship between strong precipitation and each physical quantity field, the following conclusions can be drawn:(1)Typhoon torrential rain is always in the junction area of the southeast jet and the mountain wind slope.(2)The heavy rainfall have some correspondences between moisture flux convergence area,high value of specific humidity area,high value of positive vorticity area and the twin peaks of pseudo equivalent temperature.In addition,the long time maintenance of near the surface layer convergence system,the east low west high terrain of Taizhou and the local bell shaped terrain are important conditions for the local production of super precipitation.