On lightning electromagnetic field propagation along an irregular terrain

Li, Dongshuai (Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, CMA Key Laboratory for Aerosol-Cloud-Precipitation, Nanjing University of Information Science and Technology, Nanjing, China ; Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Azadifar, Mohammad (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rachidi, Farhad (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Rubinstein, Marcos (School of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland) ; Paolone, Mario (Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland) ; Pavanello, Davide (School of Engineering, HES-SO Valais-Wallis, HEI, HES-SO // University of Applied Sciences Western Switzerland) ; Metz, Stefan (Huber+Suhner AG, Herisau, Switzerland) ; Zhang, Qilin (Nanjing University of Information Science and Technology, Nanjing, China) ; Wang, Zhenhui (Nanjing University of Information Science and Technology, Nanjing, China)

In this paper, we present a theoretical analysis of the propagation effects of lightning electromagnetic fields over a mountainous terrain. The analysis is supported by experimental observations consisting of simultaneous records of lightning currents and electric fields associated with upward negative lightning flashes to the instrumented Säntis tower in Switzerland. The propagation of lightning electromagnetic fields along the mountainous region around the Säntis tower is simulated using a full-wave approach based on the finite-difference time-domain method and using the two-dimensional topographic map along the direct path between the tower and the field measurement station located at about 15 km from the tower. We show that, considering the real irregular terrain between the Säntis tower and the field measurement station, both the waveshape and amplitude of the simulated electric fields associated with return strokes and fast initial continuous current pulses are in excellent agreement with the measured waveforms. On the other hand, the assumption of a flat ground results in a significant underestimation of the peak electric field. Finally, we discuss the sensitivity of the obtained results to the assumed values for the return stroke speed and the ground conductivity, the adopted return stroke model, as well as the presence of the building on which the sensors were located.


Keywords:
Article Type:
scientifique
Faculty:
Ingénierie et Architecture
School:
HEI-VS
HEIG-VD
Institute:
IICT - Institut des Technologies de l'Information et de la Communication
Date:
2016-02
Published in:
IEEE Transactions on Electromagnetic Compatibility
Numeration (vol. no.):
2016, vol. 58, no. 1, pp
DOI:
ISSN:
0018-9375
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-10-20, last modified 2020-10-27

Fulltext:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)