地震学报2011，Vol.33Issue(2)：252-261,10.DOI:10.3969/j.issn.0253-3782.2011.02.012
天津轨道交通对地磁观测干扰的影响研究
Magnetic perturbation to geomagnetic observation caused by Tianjin railway transit
摘要
Abstract
Magnetic field created by DC traction power supply system has become a serious man-made perturbation to the operations of geomagnetic observatories near big cities in China. Leakage current produced by DC traction power supply system is the key factor. Based on vacuum line current magnetic field model in railway transit, this paper presents a more general and simple model for quantitative estimation of the magnetic perturbation. It is effective in fast estimating magnetic perturbation value. Using this model we obtained two numerical example results: distance decay of magnetic perturbation and the amplitude variation at the end of railway line caused by motion of locomotive. In order to verify this model, field measurement was carried out in the vicinity of Jinghai, Tianjin. The ground structure in this area is approximately layered.Theoretical calculation and field measurement show a good agreement, indicating that at the distance of 45 km, the perturbation caused by Tianjin subway can reach to 0.5 nT.关键词
泄露电流/地磁观测/直流牵引轨道交通系统/人工干扰Key words
leakage current/ geomagnetic observatory/ DC traction power supply system/ urban rail transit/ man-made perturbation分类
天文与地球科学引用本文复制引用
谢凡,滕云田,徐学恭,邢西淳,胡星星..天津轨道交通对地磁观测干扰的影响研究[J].地震学报,2011,33(2):252-261,10.基金项目
地震行业科研专项(20070817)资助.中国地震局地球物理研究所论著11AC1004. （20070817）
