Three-Dimensional Transient Electromagnetic Forward Modeling In Direct Time-Domain by Vector Finite Element

DOI

10.2991/iceeg-16.2016.18How to use a DOI?

Keywords

transient electromagnetic method, three-dimensional forward modeling, direct time-domain by vector finite element mothed, ramp time

Abstract

In this paper, the direct time domain vector finite element method was used to forward three-dimensional transient electromagnetic fields excited by loop source. From Maxwell's equations met by time domain electromagnetic field we can directly export the double curl equations met by electric field, and then get the variation of electric field equations. Take backward difference to discrete the time item, after the element analysis for all units in the calculation area, and synthesize all units to get the stiffness matrix. The sparse matrix is stored by the CSR format. This work introduces the source current density into the double curl equations met by electric field. We use a trapezoidal waveform in the excitation source and taking the switch on-time, on-time and switch off-time into consideration. A loop source is added in modeling. In fact, this method makes the models arbitrarily complex in resistivity distribution. In the process of solving the equations, take the whole time zone segmentation process strategy, to take a unified iterative steps within the section to improve the computational efficiency. Then we use the direct time-domain vector finite element mothed to calculate and verify the uniform half-space model, shallow water undulating terrain model and the marine low resistance model

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - He Li
AU  - Xiu Li
AU  - Weihua Yao
PY  - 2016/06
DA  - 2016/06
TI  - Three-Dimensional Transient Electromagnetic Forward Modeling In Direct Time-Domain by Vector Finite Element
BT  - Proceedings of the 7th International Conference on Environment and Engineering Geophysics & Summit Forum of Chinese Academy of Engineering on Engineering Science and Technology
PB  - Atlantis Press
SP  - 62
EP  - 65
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceeg-16.2016.18
DO  - 10.2991/iceeg-16.2016.18
ID  - Li2016/06
ER  -