Articles | Volume 20, issue 7
Ann. Geophys., 20, 1063–1072, 2002
https://doi.org/10.5194/angeo-20-1063-2002

Special issue: SPACE WEATHER

Ann. Geophys., 20, 1063–1072, 2002
https://doi.org/10.5194/angeo-20-1063-2002

  31 Jul 2002

31 Jul 2002

Modelling of geomagnetic induction in pipelines

L. Trichtchenko and D. H. Boteler L. Trichtchenko and D. H. Boteler
  • Geomagnetic Laboratory, Geological Survey of Canada, 7 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada
  • Correspondence to: L. Trichtchenko
  • (ltrichtc@NRCan.gc.ca)

Abstract. Geomagnetic field variations induce telluric currents in pipelines, which modify the electrochemical conditions at the pipe/soil interface, possibly contributing to corrosion of the pipeline steel. Modelling of geomagnetic induction in pipelines can be accomplished by combining several techniques. Starting with geomagnetic field data, the geoelectric fields in the absence of the pipeline were calculated using the surface impedance derived from a layered-Earth conductivity model. The influence of the pipeline on the electric fields was then examined using an infinitely long cylinder (ILC) model. Pipe-to-soil potentials produced by the electric field induced in the pipeline were calculated using a distributed source transmission line (DSTL) model. The geomagnetic induction process is frequency dependent; therefore, the calculations are best performed in the frequency domain, using a Fourier transform to go from the original time domain magnetic data, and an inverse Fourier transform at the end of the process, to obtain the pipe-to-soil potential variation in the time domain. Examples of the model calculations are presented and compared to observations made on a long pipeline in the auroral zone.

Key words. Geomagnetism and paleomagnetism (geo-magnetic induction)

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