1887
Special Issue: Advances in forward modeling and inversion of geophysical electromagnetic data
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

The semi-airborne transient electromagnetic method using short-offset has the characteristics of high signal-to-noise ratio and large detection depth, which can adapt to environmental monitoring, groundwater mapping and metal survey in complex terrain. The terrain effects will modulate semi-airborne transient electromagnetic method response. Most terrains effects studies assume that the anomalous body is located below the centre of topography or under the slope, however, in the direction of electromagnetic propagation, several scenarios exist regarding the position of an anomalous body relative to a topography, and different situations will have different anomalous characteristics. In this study, the time-domain finite-element modelling using unstructured mesh is used to investigate the distribution of the electromagnetic response of different time channels of different anomalous bodies in different positions relative to a topography under two conditions: mountains and valleys. The results show that (1) The influence of the relative position of the anomalous body and the topography is similar in the mountain and valley. When the anomalous body is located on the side of the topography far from the transmitter, it is more affected by the topography than when the anomalous body is located on the side of the topography near the transmitter, and (2) in the early stage, the distribution of the electromagnetic response is primarily determined by the topography, in the middle stage, the coupling between anomalous bodies at different locations and the topography results in an extremely complex response distribution, in the late stage, the response distribution primarily originates from the eddy current of the anomalous body, and the effect of the topography is moderate. When using semi-airborne transient electromagnetic method for environmental monitoring and shallow resources survey in complex terrain, data processing and interpretation should be performed based on the position of the anomalous body relative to the topography.

© 2023 Australian Society of Exploration Geophysicists
Loading

Article metrics loading...

/content/journals/10.1080/08123985.2023.2190017
2024-07-03
2026-01-19

  • From This Site

    /content/journals/10.1080/08123985.2023.2190017
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. Cai, J., P.Yogeshwar, W.Mörbe, M.Smirnova, A.Haroon, M.Becken, and B.Tezkan. 2022. 2-D joint inversion of semi-airborne CSEM and LOTEM data in eastern thuringia, Germany. Geophysical Journal International229, no. 3: 1475–1489.
     [Google Scholar]
  2. Chang, J., and G.Xue. 2020. Three⁃dimensional numerical simulation of diffusion law of short⁃ offset grounded⁃ wire transient electromagnetic field. Journal of Earth Sciences and Environment42, no. 6: 711–721.
     [Google Scholar]
  3. Chen, T., and D.Yang. 2022. Modeling and inversion of airborne and semi-airborne transient electromagnetic data with inexact transmitter and receiver geometries. Remote Sensing14, no. 4: 915–928.
     [Google Scholar]
  4. Franke, A., R. U.Borner, and K.Spitzer. 2007. Adaptive unstructured grid finite element simulation of two-dimensional magnetotelluric fields for arbitrary surface and seafloor topography. Geophysical Journal International171, no. 1: 71–86.
     [Google Scholar]
  5. Gunderson, B. M.1986. Three-dimensional transient electromagnetic responses for a grounded source.Geophysics51, no. 11: 2117–2130.
     [Google Scholar]
  6. Guo, Z., G.Xue, J.Liu, and X.Wu.2020. Electromagnetic methods for mineral exploration in China: A review. Ore Geology Reviews 118: 103357.
     [Google Scholar]
  7. Haber, E., S.Heldmann, and U.Ascher. 2007. Adaptive finite volume method for distributed non-smooth parameter identification. Inverse Problems23, no. 4: 1659–1676.
     [Google Scholar]
  8. Yang, H., H.Cai, M.Liu, Y.Xiong, Z.Long, J.Li, and X.Hu. 2022. Three-dimensional inversion of semi-airborne transient electromagnetic data based on a particle swarm optimization-gradient descent algorithm. Applied Sciences-Basel12, no.6 : 3042.
     [Google Scholar]
  9. Ito, H., H.Kaieda, T.Mogi, A.Jomori, and Y.Yuuki. 2014. Grounded electrical-source airborne transient electromagnetics (GREATEM) survey of Aso volcano, Japan. Exploration Geophysics45, no. 1: 43–48.
     [Google Scholar]
  10. Ji, Y. J., Y.Wang, J.Xu, F. D.Zhou, S. Y.Li, Y. P.Zhao, and J.Lin. 2013. Development and application of the grounded long wire source airborne electromagnetic exploration system based on an unmanned airship. Chinese Journal of Geophysics(in chinese)56, no.11 : 3640–3650.
     [Google Scholar]
  11. Jing, X., X.Li, H.Cao, J.Zhou, and W.Liu. 2022. The processing workflow of semi-airborne transient electromagnetic data using geological modeling and three-dimensional numerical simulation – A case history in yunnan, China.Journal of Applied Geophysics203: 104667.
     [Google Scholar]
  12. Liu, F., L.Huang, L.Liu, J.Li, Z.Geng, Q.Zhang, and G.Fang. (2016). A new semi-airborne transient electromagnetic system and application of detecting underground conductor in east ujimqin banner, China. 7th International Conference on Environmental and Engineering Geophysics (ICEEG)/Summit Forum of Chinese-Academy-of-Engineering-on-Engineering-Science-and-Technology, Beijing, Peoples Republic of China.
  13. Liu, F., Q.Zhang, Z.Geng, Y.Pang, Y.Li, and G.Fang. 2018. Application of grounded electrical source airborne TEM system in changyi BIF deposit, Jiaodong Peninsula of Eastern China. Annals of Geophysics61, no. 4: PA448.
     [Google Scholar]
  14. Liu, Y., C.Qiu, Z.Hui, B.Zhang, X.Ren, and A.Weng. 2019. 3-D inversion of transient EM data with topography using unstructured tetrahedral grids. Geophysical Journal International217, no. 1: 301–318.
     [Google Scholar]
  15. Liu, C., M.Zhang, J.Ma, H.Zhou, J.Liang, and J.Lin. 2020. Divergence of tipper vector imaging for ground–airborne frequency-domain electromagnetic method with orthogonal sources. Journal of Electromagnetic Waves and Applications34, no. 3: 316–329.
     [Google Scholar]
  16. Liu, G., and A.Becker. 1992. Evaluation of terrain effects in AEM surveys using the boundary element method. Geophysics57 no. 2: 272–278.
     [Google Scholar]
  17. Lu-Yuan, W., Y.Chang-Chun, L.Yun-He, S.Yang, R.Xiu-Yan, H.Zhe-Jian, Z.Bo, and X.Bin. 2021. Three-dimensional forward modeling for the SBTEM method using an unstructured finite-element method. Applied Geophysics18, no. 1: 101–116.
     [Google Scholar]
  18. Lu, K., X.Li, Y.Fan, J.Zhou, Z.Qi, W.Li, and H.Li. 2021. The application of multi-grounded source transient electromagnetic method in the detections of coal seam goafs in Gansu Province, China. Journal of Geophysics and Engineering18, no. 4: 515–528.
     [Google Scholar]
  19. Meng, X., S.Qiu, and Y.Ji. 2020. Grounded electrical source ground-airborne transient electromagnetic modelling with fictitious wave field methods. Journal of Earth System Science129, no. 1: 130.
     [Google Scholar]
  20. Mogi, T., A.Jomori, N.Jomori, Y.Azuma, and E.Fomenko. 1998. Development of grounded electrical source airborne transient EM (GREATEM). Exploration Geophysics29, no. 1-2: 61–64.
     [Google Scholar]
  21. Mogi, T., K.Kusunoki, H.Kaieda, H.Ito, A.Jomori, N.Jomori, and Y.Yuuki. 2009. Grounded electrical-source airborne transient electromagnetic (GREATEM) survey of Mount Bandai,, north-eastern Japan. Exploration Geophysics40, no. 1: 1–7.
     [Google Scholar]
  22. Nabighian, M. N.1988. Electromagnetic methods in applied geophysics: voume 1, theory. Tulsa:Society of Exploration Geophysicists.
  23. Qi, Y.-F., C. C.Yin, Y. H.Liu, and J.Cai. 2017. 3D time-domain airborne EM full-wave forward modeling based on instantaneous current pulse. Chinese Journal of Geophysics60, no. 1: 369–382.
     [Google Scholar]
  24. Qi Yanfu, L. X., Sun Naiquan, Q. Zhipeng, Z. Jianmei, Z. Mingjing, and X. Tao. 2022. Analysis of influence characteristics of topography on grounded-source short-offset transient electromagnetic responses. Journal of Jilin University (Earth Science Edition)52, no. 1: 247–260.
     [Google Scholar]
  25. Sasaki, Y., and H.Nakazato. 2003. Topographic effects in frequency-domain helicopter-borne electromagnetics. Exploration Geophysics34 : 24–28.
     [Google Scholar]
  26. Steuer, A., M.Smirnova, M.Becken, M.Schiffler, T.Günther, R.Rochlitz, P.Yogeshwar et al.2020. Comparison of, novel semi-airborne electromagnetic data with multi-scale geophysical, petrophysical and geological data from Schleiz, Germany. Journal of Applied Geophysics182: 104172.
     [Google Scholar]
  27. Sun, H., S. B.Liu, and Y.Yang. 2021. Crank-Nicolson FDTD 3D forward modeling for the transient electromagnetic field. Chinese Journal of Geophysics64, no. 1: 343–354.
     [Google Scholar]
  28. Tang, X.-G., W.Hu, and L.Yan. 2011. Topographic effects on long offset transient electromagnetic response. Applied Geophysics8, no. 4: 277–284.
     [Google Scholar]
  29. Um, E., J.Harris, and D.Alumbaugh. 2010. 3D time-domain simulation of electromagnetic diffusion phenomena: A finite-element electric-field approach. Geophysics75, no. 4: 115–126.
     [Google Scholar]
  30. Um, E. S., M.Commer, G.Newman, and G.Hoversten. 2015. Finite element modelling of transient electromagnetic fields near steel-cased wells. Geophysical Journal International202, no. 2: 901–913.
     [Google Scholar]
  31. Weiss, C., and S.Constable. 2006. Mapping thin resistors and hydrocarbons with marine EM methods, part II — modeling and analysis in 3DGeophysics71, no. 6: 321–332.
     [Google Scholar]
  32. Wen, L., J.Cheng, S.Huang, J.Zhou, Y.Han, F.Li, and J.Zhao. 2019. Review of geophysical exploration on mined-out areas and water abundance. Journal of Environmental and Engineering Geophysics24, no. 1: 129–143.
     [Google Scholar]
  33. Wu, X., G.Xue, G.Fang, X.Li, and Y.Ji. 2019. The development and applications of the semi-airborne electromagnetic system in China. IEEE Access7: 104956–66.
     [Google Scholar]
  34. Xue, G.-Q., W. Y.Chen, N. N.Zhou, and H.Li. 2013. Short-offset TEM technique with a grounded wire source for deep sounding. Chinese Journal of Geophysics56, no. 1: 255–261.
     [Google Scholar]
  35. Xue, G.-Q., H. Y.Wang, S.Yan, and N. N.Zhou. 2014. Time-domain green function solution for transient electromagnetic field. Chinese Journal of Geophysics57, no. 2: 671–678.
     [Google Scholar]
  36. Xue, G. Q.2018. The development of near-source electromagnetic methods in China. Journal of Environmental and Engineering Geophysics23, no. 1: 115–124.
     [Google Scholar]
  37. Xue, G., W.Chen, J.Cheng, S.Liu, J.Yu, K.Lei, W.Guo, X.Feng. 2019. A review of electrical and electromagnetic methods for coal mine exploration in China. IEEE Access7: 177332–41.
     [Google Scholar]
  38. Xue, G. Q., C.Weiying, and Y.Shu. 2018a. Research study on the short offset time-domain electromagnetic method for deep exploration. Journal of Applied Geophysics155: 131–137.
     [Google Scholar]
  39. Xue, G. Q., X.Li, S.Yu, W.Chen, and Y.Ji. 2018b. The application of ground-airborne TEM systems for underground cavity detection in China. Journal of Environmental and Engineering Geophysics23, no. 1: 103–113.
     [Google Scholar]
  40. Yang, H., H.Cai, M.Liu, Y.Xiong, Z.Long, J.Li, and X.Hu. 2022. Three-dimensional inversion of semi-airborne transient electromagnetic data based on finite element method. Near Surface Geophysics20: 661–678.
     [Google Scholar]
  41. Zhang, H. H., Z.Fan, and R.Chen. 2014. Marching-on-in-degree solver of time-domain finite element-boundary integral method for transient electromagnetic analysis. IEEE Transactions on Antennas and Propagation62, no. 1: 319–326.
     [Google Scholar]
  42. Zhang, B., C. C.Yin, Y. H.Liu, and J.Cai. 2016. 3D modeling on topographic effect for frequency-/time-domain airborne EM systems. Chinese Journal of Geophysics59, no. 4: 1506–1520.
     [Google Scholar]
  43. Zhao, Y., X.Li, Y. P.Wang, J. L.Guo, Y. Q.Zeng. 2017. Characteristics of terrain effect for 3-D ATEM. Chinese Journal of Geophysics60, no. 1: 383–402.
     [Google Scholar]
  44. Zhdanov, M., and K.Yoshioka. 2006. Integral equation method for 3D modeling of electromagnetic fields in complex structures with inhomogeneous background conductivity. Geophysics71, no. 6: 333–345.
     [Google Scholar]
/content/journals/10.1080/08123985.2023.2190017
Loading
The effects of relative position of anomalous body and topography on the semi-airborne transient electromagnetic survey
Exploration Geophysics 55, 392 (2024); https://doi.org/10.1080/08123985.2023.2190017
/content/journals/10.1080/08123985.2023.2190017
/content/journals/10.1080/08123985.2023.2190017
Loading

Data & Media loading...

  • Article Type: Research Article
Keyword(s): electromagnetic response; Semi-airborne EM; topography effect

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error