湖北省高速公路雷电活动特征及风险区划研究

Characteristics of Lightning Activity and Risk Zoning for the Expressway Network in Hubei Province

为揭示湖北省高速公路沿线雷电参数分布特征及其区域差异,利用湖北省2007年～2017年闪电监测数据,采用线路走廊网格、层次模型等数理统计方法,分析研究湖北省主要高速公路沿线雷电活动特征,提出了基于雷电参数的风险区划方法。结果表明:湖北东线高速公路百公里闪电频数最多,且明显高于西线高速公路,南、北两条高速公路闪电频数差异较小;湖北高速公路地闪密度总体呈现东多西少、南多北少的区域分布特征;东线高速公路沿线发生雷电绕击和反击的概率高于西线高速公路,北线高速公路沿线发生雷电绕击和反击的概率高于南线高速公路;北线高速公路沿线雷电感应危害最大,东线高速公路次之,南线高速公路沿线雷电感应危害最小。以0.3、0.4、0.6、0.8为阈值分割点,将湖北高速公路划分为极强、强、中等、弱和极弱等5个雷电灾害风险等级,其结果可为防雷工程设计、雷击风险评估、雷电预警预报信息发布等提供参考依据。

In order to reveal the distribution characteristics and regional differences of lightning parameters along expressways in Hubei Province,based on the lightning detection data from 2007 to 2017,by means of mathematical statistics,such as line corridor grid and hierarchical model,the characteristics of lightning activity along the main highways in Hubei Province are analyzed and studied,and the method of risk zoning based on lightning parameters is proposed.The results indicate that:the lightning frequency of 100 kilometers along east line is the largest,and is obviously higher than that of the west line;the difference of lightning frequency between the two highways in north and south is smaller;the lightning density among Hubei expressways has regional distribution characteristics,the west is less than the east,and the north is less than the south;the probability of shielding failure and back striking along the east line is higher than that of the west line,and the probability shielding failure and back striking along the north line is higher than that of the south line;the lightning induced hazard is the most dangerous along the north line,and the second is the east line,and the least is the south line.With 0.3,0.4,0.6,0.8 as threshold segmentation points,the expressways in Hubei Province is divided into five risk grades of very strong,strong,medium,weak and extremely weak.The results can provide reference for lightning protection engineering design,lightning risk assessment,and lightning early warning information release.