Effect of the Real Irregular Terrain on the Lightning-radiated Electromagnetic Field Propagation  

作　　者：Fangrong ZHOU Yi MA Hao PAN Bin ZOU Jing YANG 

机构地区：[1]Electric Power Research Institute,Yunnan Power Grid Company Ltd.,Kunming 650217,China [2]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 Disaster(CICFEMD)/Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology,Nanjing 210044,China

出　　处：《Meteorological and Environmental Research》2021年第3期55-61,共7页气象与环境研究（英文版）

基　　金：Supported by the Application of the Forecasting Warning System for Lightning Disaster in Yunan Plateau(YNKJXM20190733);National Natural Science Foundation of China(41775006,41575004).

摘　　要：The propagation of the lightning-radiated electromagnetic field along the real irregular terrain around Yangzhou Direction Finder(DF)site(119°42′E,32°39′N)and Nanjing DF site(118°46′E,32°03′N)of Jiangsu Province in China is estimated.The results show that the rough irregular terrain results in the rapid magnitude attenuation and the increase of the rise-time of the field waveform.For example,for the Yangzhou DF site as the circumference of a radius of 45 km,the root-mean-squared height(RMSH)of the real irregular terrain varies from 7 to 33 m;the extra field attenuation relative to the ideal ground surface ranges from 1%to 11%,and the extra rise-time increment varies from 0.1 to 0.6μs.Therefore,the extracted current peak of lightning return stroke may be underestimated from the remotely measured electromagnetic field,and the error varies along with different azimuths.

关 键 词：Global Digital Elevation Model(GDEM) Irregular terrain Lightning electromagnetic fields Effective impedance Attenuation function 

分 类 号：P427.3[天文地球—大气科学及气象学]