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《Meteorology and Disaster Reduction Research》 2018-02
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Numerical Simulation and Comparison of Two Rainstorms in the Middle and Lower Reaches of the Yangtze River during Meiyu Period in 2011

Liang Wei;Wu Junjie;Duan Lian;Meteorological observatory Jiangxi Air Traffic Management Bureau;Civil Aviation Flight University of China;  
Based on WRF numerical model,two rainstorms occurred during 2011 Meiyu period were simulated.Comparative analysis of their circulation and physical fields showed that:1)The movement of southwest vortex and the coupling of two jets at upper and lower levels were closely related to the rainstorms,which mainly caused the differences between two rainfalls.2)For the process of"6·10",a flimsy southwest vortex system moved towards northeast as the weakened trough of Plateau moved eastward,and both of the southwest jet stream at lower level and the rainfall occurred at north;for the process of"6·14",a deep southwest vortex moved slowly along the Yangtze river valley as the enhanced trough moved eastward,and both of the jet stream at lower level and the rainfall were located in the south.3)The strong precipitation centers of two proces-ses were in the coupling areas of jet streams at upper and lower levels.The range and intensity of the coupling area of"6·10"was smaller and weaker,thus the convergence ascending motion was also weaker,which could not cause heavy rain.On the contrary,during the process of"6·14",the coupling area coverage of jet streams along the Yangtze River valley was larger,and the strong convergence ascending motion provided plenty of moisture,leading to the wide range and heavy rain.
【Fund】: 中国民用航空飞行学院重点项目(编号:ZJ2014-02);; 民航空管科技项目(编号:0121702)
【CateGory Index】: P458.121.1
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