A Study of the 3D Wind of Heavy Rain with Dual\|Doppler Radar

The dynamic structural features of the heavy rain are investigated. The three\|dimensional fields of a meso\|β heavy rain weare retrieved from the dual\|Doppler radar data located on Hefei and Maanshan cities by using a multiple\|Doppler synthesis and continuity adjustment technique (MUSCAT) from 1900 BT (Beijing Time) to 2200 BT on 13 July 2001. Due to the effect of wind\|shift line and convection system, it produced a heavy precipitation in the dual\|Doppler coverage area, up to 104.4 mm of rainfall in 24 hours occurred in Quanjiao area. The dynamic properties of the 3D wind fields in this meso\|β heavy rain are: horizontal shear and small\|scale vortices exist at the low level and there are several vertical circulations. There are strong divergence at the upper level and convergence at the lower level. The small\|scale vortices at 35 km level, the shear line and convergence line at the low and middle level play an important role in the heavy rain. Mergence of the south and north band echo is the initiation and maintain mechanism of this rain. The rainfall after mergence accounts for a high proportion. The results of 3D wind are also in good agreement with the environment analysis and reasonable.