雷州半岛夏季闪电特征分析

根据雷州半岛夏季雷暴的气候特征,利用布设在雷州半岛徐闻、遂溪两点的LD型闪电定位系统对雷州半岛的闪电进行观测,对雷州半岛7月份的逐日闪电总次数、正闪比、幅值均值、幅值分布、闪电波前陡度、闪电累积概率分布等观测值进行分析,得出了雷州半岛夏季闪电活动的部分规律。分析表明:雷州半岛夏季最大闪电电流峰值为-153 kA;负闪明显多于正闪,占闪电总数的71.71%;电流峰值都主要集中在10 kA～40 kA;闪电波前上升陡度相对集中在1μs～20μs,占观测总闪击的91.5%,3μs～10μs达到峰值。分析所得结论对本地区防雷减灾工作有一定的实际指导意义。

A Study on the Lightning Characteristics of Leizhou Peninsula in Summer

This article analyzes the lightning climate characteristics of Leizhou Peninsula by using the data obtained by two set LD lightning positioning systems in Leizhou Peninsula.The values observed include the total number of lightning,positive lightning ratio,average lightning current amplitude value,peak lightning current value,lightning current amplitude distribution,wavefront steepness,lightning cumulative probability distribution and so on.The analysis has shown some rules of lightning activity in summer in this region as follows: the biggest lightning current peak value is – 153 kA,negative lightning is more than positive lightning accounting for the total lightning 71.71%,the lightning current peak value mainly concentrates in 10 kA-40 kA,lightning wavefront steepness concentrates relatively in 1μs-20μs accounting for 91.5% and achieves the peak value in 3μs-10μs.The results obtained have certain practical instruction to local lightning protection and disaster reduction.