梅州雷电危险性分布特征分析

Analysis of Lightning Hazard Distribution Characteristics in Meizhou

  • 摘要: 利用梅州市近60年的年雷暴日、2002—2013年地闪资料及历史天气图,对梅州市雷电活动规律及雷电发生的天气学成因进行了分析。分析表明,梅州市近60年雷电活动大致呈现周期性变化,近几年雷电活动频繁度略有减少,空间分布特征呈明显的“中部高,南至北递减的趋势”,其中,梅江区最高,蕉岭最低。雷暴日季节性变化较明显,一年四季均有发生,属于多雷区,各年的雷电活动的月分布曲线、时分布曲线呈明显的“单峰”特性,主要集中分布在4—9月,尤其是8月。雷电活动日变化峰值区为14—19时(北京时),其中16时段雷电活动最为强烈。危险区划结果表明,梅州地区雷暴活动的高危险性区域位于梅州中部、五华中部以及丰顺中南部地区,低危险性区域位于北部地区,南部地区风险明显强于北部地区。雷电活动规律与天气系统密切相关,因而,利用雷电活动规律及雷电发生的天气学成因,可以合理安排日常生产生活,减少雷电灾害的发生。

     

    Abstract: Using the thunderstorm days, 2002-2013 yearly lightningflashes and historical weather maps from Meizhou during the past 60 years, the lightning activity patterns, and the synoptic causes of lightning occurrence in Meizhou were analyzed. The analyses showed that there were periodic changes in lightning activity in Meizhou city in the last 60 years. The frequency of lightning activity has slightly reduced during recent years. The spatial distribution characteristics showed lightening activity was high in the middle with a south to north decreasing trend. The Meijiang area had the highest occurrences of lightening and Jiaoling has the lowest. There was evidence of seasonal variation in thunderstorm days. Each year, the lightning activity distribution curve showed a single peak characteristic, mainly concentrated in April to September, especially in August. The daily lightning activity usually peaked between 2 and 7 p.m., being most frequently at 4 p.m. Risk zoning results showed that the high-risk areas of thunderstorm activity in Meizhou were located in central Meizhou, central Wuhua, and central and southern Fengshun. The low risk areas were located in the northern region, and the risk in the southern region was significantly stronger than that in the northern region. The law of lightning activity was closely related to the weather system. Using the information from this study, daily life can be planned to reduce lightening-related hazards.

     

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