合作市近50年暴雨时空分布特征及影响系统研究

Analysis and Study on Temporal and Spatial Distribution Characteristics and Impact System of Heavy Rainfall in Hezuo City in Recent 50 Years

利用甘肃省合作市气象局1971—2020年的逐日降水资料及区域站降水资料,共筛选出了13次暴雨过程,出现23站次。统计分析合作市暴雨时空分布特征和发生发展规律,结果表明:合作市暴雨发生的概率比较小,一般出现在6月中旬—9月上旬,具有明显的午后—前半夜型。近10年暴雨出现的次数明显增多,造成的经济损失也增加显著。分析总结了合作市暴雨出现的主要环流类型大致分为4种类型:副高边缘型、低槽型、低涡型和副高内部型。以副高边缘型为主。

Based on the daily precipitation data of the station and the regional precipitation data from 1971 to 2020 of the Meteorological Bureau of Hezuo City,Gansu Province,a total of 13 rainstorm processes were screened,with 23 stations.The statistical analysis of the spatiotemporal distribution characteristics and occurrence and development rules of heavy rain in Hezuo City shows that the probability of heavy rain in Hezuo City was relatively small,generally occurring in the middle of June to the first ten days of September,with an obvious afternoon-early midnight pattern.In the past 10 years,the number of rainstorms has increased significantly,and the economic losses have also increased significantly.The main circulation types of heavy rain in Hezuo City are roughly divided into four types:subtropical high edge type,low trough type,low vortex type and subtropical high internal type.It is dominated by the marginal type of subtropical high.