乌鲁木齐地区山体地形对地闪回击定位精度的影响  

Effect of Mountain Terrain on Lightning Return Strokes Location Accuracy in Urumqi

作　　者：杨敢 陈佳雯 戴炳哲 姚年鹏 蒋尧 张其林[1] YANG Gan;CHEN Jiawen;DAI Bingzhe;YAO Nianpeng;JIANG Yao;ZHANG Qilin(Key Laboratory of Meteorological Disaster,Ministry of Education(KLME)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science&Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心/中国气象局气溶胶与云降水重点开放实验室,南京210044

出　　处：《电瓷避雷器》2022年第3期42-48,共7页Insulators and Surge Arresters

基　　金：国家重点研发计划(编号:2017YFC1501505);河北省科技厅重点研发计划项目(编号:19275409D);国家自然科学基金面上项目(编号:41775006)。

摘　　要：利用二维时域有限差分算法(FDTD),构建了真实地形下的雷电电磁波传播模型,研究了乌鲁木齐周边区域山地地形对雷电电磁波传播的影响,然后提出了一种修正闪电定位误差的方法即不同步长的地形包络法。模拟结果表明:1)山地地形会明显改变切向磁场的波形峰值大小和上升沿时间,给闪电定位带来误差,波形峰值变化最大的增加了57%,上升沿时间增加范围在1~5μs,相比平地最大定位误差增加了3 800 m。2)步长为10 km的地形包络法修正效果最好,最大修正了510 m的定位误差。Using the two-dimensional time-domain finite difference algorithm(FDTD), a lightning electromagnetic wave propagation model under real terrain was constructed, the influence of mountain terrain on the electromagnetic wave propagation in the surrounding area of Urumqi was studied, and then a method to correct lightning location error was proposed, that is terrain envelope method with different resolution. The simulation results show that: 1) Mountain terrain will obviously change the peak value of the tangential magnetic field and the rising edge time, which will bring errors to the lightning location. The peak value of the waveform changes by a maximum of 57%, and the rising edge time increases in the range of 1~5 μs. Compared with flat ground, the maximum location error is increased by 3 800 m. 2) The terrain envelope method with a resolution of 10 km has the best correction effect, and the maximum of corrected location error is more than 510 m.

关 键 词：雷电电磁场 时域有限差分 山地地形 闪电定位 地形包络法 

分 类 号：TM86[电气工程—高电压与绝缘技术]