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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2021.10
- 수록면
- 675 - 684 (10page)
- DOI
- 10.1007/s12303-020-0060-5
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초록· 키워드
오류제보하기
The time-domain/transient electromagnetic (TEM) method employs an alternating magnetic field that is established by passing a bidirectional pulsed current through a transmitter loop. A large wire loop on or above the earth is one of the most widely used sources in TEM survey systems. To simulate TEM responses of the large loop system, the effect of the loop size must be considered in a numerical modeling scheme. We have developed an efficient three-dimensional (3D) TEM modeling algorithm using a staggered-grid finite-difference time-domain (FDTD) method. In this paper, we first derive FDTD TEM equations using fictitious displacement currents based on an explicit mid-point method. Then, we employed a conversion method to efficiently obtain stepoff TEM responses from step-on responses. Further, following the concept of the conversion method, the charging and discharging processes of current waveform in loop does not need to be identical, implying we can apply the simulation scheme for more general source waveforms. The developed algorithm has been verified through comparison of numerical results for a homogeneous halfspace medium. Finally, we analyze TEM responses generated from a large loop source for a 3D conductive body buried in a homogeneous half space.
목차
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참고문헌 (30)
참고문헌 신청
Auken, E. / 2006 / A survey of current trends in near-surface electrical and electromagnetic methods / Geophysics 71:G249~G260
Chongo, M. / 2015 / Airborne and ground‐based transient electromagnetic mapping of groundwater salinity in the Machile-Zambezi Basin, southwestern Zambia / Near Surface Geophysics 13:383~396
Christiansen, A.V. / 2003 / A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM)measurements in Denmark / Geophysics 68:523~534
Cockett, R. / 2015 / SimPEG: an open source framework for simulation and gradient based parameter estimation in geophysical applications / Computers and Geosciences 85:142~154
Commer, M. / 2015 / Transient-electromagnetic finite-difference time-domain earth modeling over steel infrastructure / Geophysics 80:E147~E162
Chongo, M. / 2015 / Airborne and ground‐based transient electromagnetic mapping of groundwater salinity in the Machile-Zambezi Basin, southwestern Zambia / Near Surface Geophysics 13:383~396
Christiansen, A.V. / 2003 / A quantitative appraisal of airborne and ground-based transient electromagnetic (TEM)measurements in Denmark / Geophysics 68:523~534
Cockett, R. / 2015 / SimPEG: an open source framework for simulation and gradient based parameter estimation in geophysical applications / Computers and Geosciences 85:142~154
Commer, M. / 2015 / Transient-electromagnetic finite-difference time-domain earth modeling over steel infrastructure / Geophysics 80:E147~E162
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