衡阳市闪电时空分布特征分析

Spatial and Temporal Distribution Characteristics of Lightning in Hengyang City

衡阳市位于湖南省中南部,湘江中游,衡山之南,属亚热带季风气候,丘陵盆地地形.本文根据2010-2016年衡阳市正负地闪统计数据,分析衡阳市闪电时空和强度分布特征.结果表明衡阳市负地闪高达96.3%,正闪只占3.7%左右,闪电月分布发生集中在6-8月,占全年发生次数的78.28%,闪电时分布主要集中15-19时,占总闪电数的55.39%,闪电密度大的区域主要分布山地、河谷区域,闪电强度闪电发生集中10-50kA强度区间,占总闪电次数的78.01%.

Hengyang City is located in the south-central part of Hunan Province,the middle reaches of Xiangjiang River and the south of Hengshan Mountain. It is a subtropical monsoon climate with Hilly Basin topography.Based on the data of positive and negative ground lightning in Hengyang City from 2010 to 2016,the temporal and spatial distribution characteristics of lightning intensity in Hengyang City are analyzed.The results show that negative lightning reaches 96.3% and positive lightning only accounts for 3.7% in Hengyang City.The monthly distribution of lightning is concentrated in June-August, accounting for 78.28% of the total number of lightning occurrences in the whole year. The distribution of lightning mainly concentrates in 15-19 hours,accounting for 55.39% of the total number of lightning.The areas with high lightning density mainly distribute in mountains and valleys.The intensity of lightning occurs in 10-50 kA range,accounting for 78.01% of the total number of lightning occurrences.