2010—2018年辽宁省雷电流幅值特征分析

基于辽宁省2010—2018年闪电定位(ADTD)资料,运用统计学方法分析了雷电流幅值时间变化特征;运用规程计算公式和IEEE推荐公式分别计算了雷电流幅值累积概率密度,并和实际地闪雷电流幅值累积概率密度曲线做了对比分析;运用最小二乘法拟合了IEEE推荐公式.结果表明:2010—2018年辽宁省地闪以负闪为主,占比高达8...

Analysis of characteristics of lightning current amplitude in Liaoning province from 2010 to 2018

The temporal variation characteristics of lightning current amplitude were analyzed using a statistical method based on the lightning data (ADTD) from 2010 to 2018 in Liaoning province. The cumulative probability densities of lightning current amplitude, calculated using the specification calculation formula and the formula recommended by IEEE, were compared with the real data curve to analyze the error. The formula recommended by IEEE was fitted with the least square method. The results show that the major CG lightning with a proportion of 89% are negative in Liaoning province from 2010 to 2018, and their current amplitudes are mainly concentrated between -50~-20 kA. The frequency of CG lightning increases year by year from 2011 to 2013 and then decreases year by year. The average lightning current amplitudes of total and negative CG lightning decreases from 2010 to 2013 year by year and then increases year by year. The CG lightning mainly occurs in the flood season from July to August, and the average lightning current amplitude is the highest in winter with a stable diurnal variation. The probability density curves of the total and negative CG lightning with the lightning current amplitude between 20-50 kA experience the fastest decrease, while those whose lightning current amplitudes are about 20 kA begin to decline slowly. The cumulative probability density curves of lightning current amplitude fitted with the formula recommended by IEEE are closer to the actual situation now than before.