武汉二七长江大桥雷暴电场仿真模拟研究  

Simulation study on electric field of thunderstorm of Erqi Yangtze river bridge in Wuhan

作　　者：范旻琪 李政[1] 陈仁君 冯又华 FAN Min-qi;LI Zheng;CHEN Ren-jun;FENG You-hua(Hubei Provincial Lightning Protection Center,Wuhan 430074,China)

机构地区：[1]湖北省防雷中心,武汉430074

出　　处：《湖北农业科学》2020年第12期45-50,共6页Hubei Agricultural Sciences

基　　金：湖北省气象局科技发展基金项目(2019Q2)。

摘　　要：为研究武汉二七长江大桥建设前后对雷暴大气电场的影响,利用IES电磁场仿真软件,采用BEM(边界元)方法模拟分析了二七长江大桥建设前后周围空间电场的变化,进一步细化分析了不同负电荷中心高度对大桥主塔及地面场强的影响。设定了8种不同位置的雷电先导,随先导的逐级递进模拟了主塔电场的变化,同时给出了电场空间分布图,分析了电场变化的特征,进而分析雷击点的可能性。结果表明,大桥建立以后,大桥塔顶部的电场强度明显增大;雷云中负电荷区的高度逐步降低,地面电场强度逐步增大;雷电先导与大桥主塔的相对位置决定了最可能的雷击点。In order to study the effect of the construction of Erqi Yangtze river bridge on electric field of thunderstorm,the BEM(Boundary Element)method,based on the IES electromagnetic field simulation software,which is used to simulate and analyze the change of the electric field before and after the construction.The influence of the height of different negative charge centers on the main tower and the ground electric field strength is further analyzed.The electric field variation of the main tower is simulated with the lightning leader step by step,which is assumed eight different locations of lightning leader.The spatial distribution of the electric field is given,the characteristics of the electric field variation are analyzed,and then the possibility of lightning strike point is analyzed.The results show that after the bridge is built,the electric field intensity on the top of the bridge tower increases obviously;The height of the negative charge area in the thundercloud decreases gradually,and the electric field intensity on the ground increases gradually;The relative position of the lightning leader and the main tower of the bridge determines the most likely lightning strike point.

关 键 词：二七长江大桥 雷暴电场 IES仿真 

分 类 号：P427.32[天文地球—大气科学及气象学] P46