基于Apriori算法的云南省雷电活动与地表覆盖类型关联性分析

Analysis on the Correlation Between Lightning Activities and Land Cover Types in Yunnan Province Based on Apriori Algorithm

充分了解不同区域的雷电活动特点是有效开展输电线路建设和差异化防雷改造的前提。基于云南省地表覆盖类型数据以及多年雷电活动监测数据,通过统计方法和Apriori算法分析了地表覆盖类型与正闪比、地闪密度、地闪强度、雷电流幅值累积概率分布等雷电活动参数的相关性。结果表明,地表覆盖类型与雷电活动密切相关,中覆盖度草地和裸岩石质地的地闪强度较大。受城市热岛效应的影响,城镇地区的正、负地闪密度相对较高。林地的正闪比例较高,建议关注林地区域输电线路对正极性地闪的防护。

A full understanding of lightning activitiy characteristics in different regions is a premise of effective transmission line construction and differentiated lightning protection transformation.Based on the land cover type and lightning data of Yunnan Province in the past 10 years,both statistical method and Apriori algorithm are used to analyze the relationship between the land cover types and the positive flash ratio,ground flash density,ground flash intensity,and the cumulative probability distribution of lightning current amplitude.The results show that the type of land cover is closely related to lightning activity.For the bare rock area and grassland with medium coverage,the ground flash intensity is large.Due to the urban heat island effect,the density of positive and negative ground flash in urban areas is higher than that in other areas.The proportion of positive lightning flashes in woodland is relatively high,so it is necessary to pay attention to the protection of the transmission lines in forest areas against positive lightning.