摘要:
In order to understand the distribution characteristics of lightning parameters for mountain and plain areas and their difference, and to bring up reference opinions on lightning protection engineering design and lightning risk assessment, the study utilizes the lightning monitoring data from December 2006 to December 2016, by mathematical statistics method, to make a contrastive analysis about the distribution characteristics of the frequency, polarity, peak current, and wave front steepness.The results show that the density of cloud-to-ground (CG) lightning in the mountain area was higher than that in the plain area;the percentage of positive CG lightning in the plain area was higher than that in the mountain area;and the percentage of positive flashes in the past 10 years had an increasing trend.The average intensity of positive CG lightning in the mountain area was 1.16 kA greater than that in the plain area, and the average intensity of negative CG lightning in the mountain area is 3.67 kA smaller than that in plain area, and intensity of total CG lightning in the plain area is 3.46 kA greater than that in the mountain area.The probability of lightning peak current (≥30 kA in the mountain area, 8.9% greater than that in the plain area).As the lightning peak current was greater than 100 kA, the probability in the plain area was 0.6%greater than that in the mountain area.The average steepness of positive CG lightning in the mountain area was 2.44 kA/μs and 2.31 kA/μs greater than that of negative and total CG lightning respectively, and the average steepness of positive, negative, and total CG lightning in the plain area was 3.41 kA/μs, 5.77 kA/μs, and 5.64 kA/μs greater than those in the mountain area, respectively.It shows that the probability of shielding failure in the mountain area is higher than that in the plain area, and the damage of positive CG lightning induction was greater than that of negative and total CG lightning;the occurrence of back flashover in plain is higher than that in the mountain area, and the damage of lightning induction was greater than that in the mountain area.%为进一步了解山区与平原雷电参数分布特征及其差异, 为山区和平原地区雷电防护工程设计和雷击风险评估提供参考, 根据湖北省ADTD地闪定位系统2006年12月至2016年12月监测的资料, 采用数理统计方法, 对山区和平原地区的地闪频次、极性、雷电流幅值和波头陡度等参数分布特征进行了对比研究.结果表明:①山区地闪密度略高于平原地区, 平原正地闪百分比稍高于山区, 近10年的正地闪百分比呈上升趋势.②正地闪平均强度山区比平原大1.16kA, 负地闪平均强度山区比平原小3.67kA, 平原总地闪平均强度比山区大3.46kA.③总地闪小雷电流幅值 (I≤30kA) 概率山区比平原大8.9%, 大雷电流幅值 (I>100kA) 概率平原比山区大0.6%.④山区正地闪平均陡度分别比负、总地闪平均陡度大2.44kA/μs和2.31kA/μs, 平原正、负、总地闪平均陡度分别比山区大3.41kA/μs、5.77kA/μs和5.64kA/μs.可以得出, 山区小雷电流绕击率大于平原, 正地闪雷电感应的危害大于负地闪和总地闪;平原地区大雷电流反击率比山区大, 雷电感应的危害大于山区.