宿州市埇桥区一次龙卷灾害调查分析

Investigation and Analysis of A Tornado Disaster in Yongqiao District,Suzhou City

对2020年7月22日宿州市埇桥区龙卷致灾强对流天气进行现场调查,直接利用实地走访、新一代天气雷达以及无人机航拍资料,综合分析了龙卷的实况。结果表明:(1)此次龙卷灾害是从埇桥区西南部祁县双堆附近出现,途经埇桥南部大泽乡镇、芦岭镇和大店镇等地后减弱,并在进入灵璧境内后禅堂镇附近彻底消失,路径长约70km、宽约200~300m。龙卷强度整体为EF1级,最强达到EF2级。(2)灾害导致的受损树木和玉米田地均呈现出明显的龙卷受灾特征。(3)雷达回波图上,龙卷发生在降水回波带前沿的块状强回波处,具有明显的中气旋和龙卷式涡旋(TVS)回波特征。(4)龙卷灾害发生地是安徽省龙卷灾害发生最多的区域,同时龙卷移动路径与安徽省冰雹龙卷灾害1号移动路径相重合。

The severe convective weather inYongqiao District,Suzhou City on July 22,2020 caused by a tornado was Investigated and was made by using.The field investigation of On-site investigation date as well as the doppler weather radar date and unmanned drone date.The results show that(1)The main impact of tornado started from sh⁃uangdui,Qixian County,southwest of Yongqiao District,and weakened after daze township,Loling Town and Dadian Town in the south of Yongqiao,and completely disappeared near Zentang Town.The disaster affected the area length of 70km and width of 200-300m and the tornado with strength to Grade EFl and Grade EF2 when strongest.(2)The damaged trees and corn fields caused by disasters all showed obvious characteristics of tornado disaster.(3)on the radar echo maps,the tornado occurred at the massive echo area on the front of the rain echo band.It has consid⁃erable mesocyclone characteristics of the tornado and tornado vortex(TVS)echo characteristics.(4)According to sta⁃tistics,the occurrence area of tornado disasters is the area where most tornado disasters occur in our province.Mean⁃while,the moving path of tornado coincides with the moving path of Hail Tornado Disaster No.1 in our province.