基于叫应和预警时长的铜仁市短历时暴雨特征分析

Analysis on Characteristics of Short Duration Rainstorm in Tongren Based on Call Response and Warning Duration

分析铜仁市短历时(3、6、12 h)暴雨频次和暴雨极值的时空分布。结果表明:梵净山东北侧的松桃县是短历时暴雨的高发区。市域内预警发布最优时刻主要在夜间,其中暴雨橙色及以上预警比例为62.5%~100%,暴雨黄色以上比例为53.6%~77.3%。3 h和6 h雨量初始达到暴雨标准的比例分别为达到50%~95.2%和58.8%~77.1%,开展强降水三个叫应十分必要。通过个例分析,县域范围内的短历时暴雨依然具有分散性和跳跃性特点,值班值守和服务时要引起足够重视。

Spatial and temporal distribution of rainstorm frequency and extreme value of short duration(3 h,6 h,12 h)in Tonren city was analyzed.The results show that Songtao county in the northeast of Fanjing Mountain,was the high occurrence area of short duration rainstorm,and the best time of issuing rainstorm orange and above warning was mainly at night,with the proportion of 62.5%(Wanshan)~100%(Sinan).The optimal time for issuing yellow rainstorm warnings or above was mainly at night,with 53.6%(Wanshan)~77.3%(Sinan).Most of the time when 3h and 6h rainfall initially reached the rainstorm standard was also at night,and the proportion was 50%(Wanshan)~95.2%(Yinjiang)and 58.8%(Yuping)~77.1%(Songtao),respectively.Therefore,it is necessary to carry out the"Call Response at 3 levels"of heavy precipitation.Through the case analysis,the short duration rainstorm in the county area still has the characteristics of dispersion and jump,and should be paid enough attention to when on duty and service.