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专家分析湖南6月雨量为何破历史极值

2017-07-02 11:42:33   

来源:湖南日报

6月以来,大范围的暴雨袭击三湘大地。据省气候中心统计,6月全省平均降雨量破历史极值,位居1951年有气象记录以来历史同期第一高位,其中6月22日以来的当月最强降雨过程仍在持续,强度指数为历史第一高值。

专家分析,此轮最强降雨过程,是由北方冷涡与副热带高压持续作用所致。

7月伊始,三湘大地继续“泡”在大雨中。省气象台专家预计,未来一周湖南雨日仍然较多,雨势整体呈走弱趋势,不过,由于目前土壤水分已经饱和、多条河流超警戒水位,未来防汛形势依然紧张,发生地质灾害风险高。

  6月全省平均下了20.5天雨,为1951年以来同期第一高位

6月,暴雨连连,洪水泛滥。省气候中心数据统计显示,2017年6月1日至30日,全省平均降水量达397.4毫米,较常年(210.13毫米)偏多89.1%,为1951年有气象记录以来历史同期第一高位(1954年396.5毫米,1998年342.5毫米)。

省气候中心主任廖玉芳介绍,6月全省平均降水量最高为辰溪710.2毫米,23县市6月累积降水量突破同期历史极值,即:泸溪、辰溪、吉首、湘阴、汨罗、平江、长沙、芷江、怀化、溆浦、麻阳、冷水江、新化、湘乡、湘潭、株洲、醴陵、武冈、城步、通道、绥宁、耒阳、双牌。

在空间分布上,湘西、湘中、湘西南、湘东北等局部地区偏多1倍以上,其中辰溪、泸溪2县偏多2倍以上。

6月,175县次出现暴雨,37县次出现大暴雨、6县次出现特大暴雨。其中暴雨县次较常年同期偏多95.1次,为1951年以来同期第一高位;大暴雨县次较常年同期偏多22.9次,为1951年以来同期第三高位;特大暴雨发生次数为1951年以来同期第一高位。

此外,全省平均降水日数为20.5天,较常年同期偏多5.5天,为1951年以来同期第一高位。

北方冷涡与副热带高压互相作用致暴雨持续,6月最强降水过程为历史最强暴雨,60个县市出现极端降水事件

6月22日,当月最强降水过程来袭,洪涝泛滥,多条河流超警。根据区域暴雨过程监测规范,此次区域暴雨过程强度指数为历史第一高值,区域暴雨过程持续时间位居历史第二高值,仅次于2002年7月17日至26日的降水过程。

此次最强降水过程已造成62个县市出现气象洪涝,其中辰溪、泸溪、安化、平江等34个县市达重度气象洪涝,城步、湘乡、隆回等13个县市达中度气象洪涝,双峰、茶陵、汉寿等15个县市达轻度气象洪涝。

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