江西瑞金核电厂厂址区域龙卷风分布特征

Distribution Characteristics of the Tornadoes Around the Nuclear Power Plant in Ruijin,Jiangxi

收集了江西瑞金核电厂厂址周边300 km×300 km的范围内1970-2013年的龙卷风资料,采用富士达-皮尔森强度分类法对龙卷风进行了等级评定,对龙卷风的时空分布和灾害特征进了分析。结果表明:调查区域44年间共记录龙卷风126次,平均每年出现2.9次;记录的龙卷风以F0级和F1级为主,F2级出现的几率较小。龙卷风主要集中在春、夏两季(3-8月),其中春季最为频发,约占全年总数的69%;一天当中,龙卷风主要集中在午后至傍晚的14:00-18:00,占龙卷风发生总次数的60%。武夷山脉东南、东北两侧和吉泰盆地为龙卷风的高发区,而赣南山区发生的次数则较少;吉安市的新干县、峡江县和永丰县及抚州市东南大部有一个相对空白的区域,这些区域较少出现龙卷风与地势高、地形起伏大有关。

The tornado data from 1970 to 2013 of the area of 300 km × 300 km surrounding Jiangxi Ruijin nuclear power plant is collected. The Tornado events are classified by a Fujitec-Pearson method and their characteristics of disasters and temporal-spatial distribution are analyzed. The results show that there are total 126 tornadoes recorded in the survey area during the 44 year period from1970 to 2013,with average 2. 9 tornadoes each year. The recorded tornadoes are mainly F0 and F1,F2 tornadoes are rarely occurred. Tornado mainly happens in spring and summer（ from March to August）,especially most frequently in spring which accounting for about 69% of the yearly total events. The peak frequency of tornado genesis in the diurnal variation is from 14： 00 to 18： 00 local time,accounted for 60% of total events during the day. The southeast and northeast of the Wuyi Mountain and Jitai Basin are the places where tornado occurs more frequently,While tornado occurs less in mountain areas of South Jiangxi. Xin＇gan County,Xiajiang County,Yongfeng County and most of the southeast of Fuzhou city are relatively empty areas that tornado takes place,which relate to their high and undulating terrain.