湖北省雷暴日数与云地闪电密度关系研究

为了研究年雷暴日数与雷击大地年平均密度关系，以满足雷电防护工程设计、雷击风险评估和雷电灾害防御工作需要，采用湖北省ADTD雷电监测定位系统探测的2007--2010年云地闪电资料和雷电监测理论探测效率在95％以上的28个气象台站的年雷暴日数，对台站周围不同半径距离范围内年平均云地闪电次数与年平均雷暴日数进行统计分析。结果表明：在台站周围18～20km范围内，相关系数明显增大，其中18km范围内相关系数最大为0．8521。由此可以认为，观测人员一般只能听到观测站点周围18～20km左右的雷声。经统计计算，拟合年平均雷暴日数与雷击大地年平均密度关系式为：Nc=0．029Td^1.5。通过2011年检验表明，采用拟合方程：Nc=0．029Td^1.5计算各台站雷击大地年平均密度明显优于规范方程：Nc=0．024Td^1.3计算的效果。

Study on the Relation of Thunderstorm Days and Lightning Density in Hubei Province

The relation of annual thunderstorm days and annual mean lightning density is researched by statistical analysis in different radius areas from the meteorological stations,based on the cloud-ground lightning data detected by the Hubei ADTD lightning position determination and monitoring system from 2007 to 2010 and the thunderstorm days of the 28 meteorological stations where lightning monitoring detection efficiency is above 95%.The results have indicated that,in the 18-20 km radius region,the correlation coefficient is obviously increased.When the radius is 18 km,the correlation coefficient reaches a maximum value of 0.8521.Thus we can consider that generally observers only can hear thunderclap in the 18-20 km radius region.The relations of annual thunderstorm days and annual mean lightning density is formulated by statistical fitting:N_G=0.0297T_d^1.5,and this equation even surpasses the standard equation(N_K= 0.024 T_d^1.3)obviously through the verification of the data in 2011.