Coupled thermo-geophysical inversion for permafrost monitoring

Research output: Contribution to conferencePaperResearchpeer-review

Abstract

We describe an approach to calibrating the thermal parameters of a ground undergoing cycles of freezing and thawing using exclusively time-lapse geoelectrical measurements collected from the ground surface. The method links a heat conduction model with a ground resistivity model in a fully coupled optimization approach. The data used for model calibration come from a high-latitude permafrost monitoring site in Ilulissat, West Greenland. Parameters calibrated on time-lapse geoelectrical data reproduce the calibration dataset with an accuracy comparable to that of a calibration on borehole temperature data, and reproduce the observed borehole temperatures to within ±0.6 °C. Given the underdetermined nature of the inverse problem and the simplicity of the heat model, the parameter values are non-uniquely determined in both calibration approaches. Nevertheless, the method offers the possibility of gaining an outlook of ground thermal conditions over a larger area, at lower cost and with reduced impact on the fragile arctic environment.
Original languageEnglish
Publication date2018
Publication statusPublished - 2018
Event5th European Conference on Permafrost - Chamonix-Mont-Blanc, France
Duration: 23 Jun 20181 Jul 2018
Conference number: 5

Conference

Conference5th European Conference on Permafrost
Number5
CountryFrance
CityChamonix-Mont-Blanc
Period23/06/201801/07/2018

Keywords

  • Geoelectrical monitoring
  • Coupled inversion
  • Permafrost
  • Time-lapse ERT
  • Heat transfer

Cite this

Tomaskovicova, S., & Ingeman-Nielsen, T. (2018). Coupled thermo-geophysical inversion for permafrost monitoring. 910-911. Paper presented at 5th European Conference on Permafrost, Chamonix-Mont-Blanc, France.
Tomaskovicova, Sona ; Ingeman-Nielsen, Thomas. / Coupled thermo-geophysical inversion for permafrost monitoring. Paper presented at 5th European Conference on Permafrost, Chamonix-Mont-Blanc, France.
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title = "Coupled thermo-geophysical inversion for permafrost monitoring",
abstract = "We describe an approach to calibrating the thermal parameters of a ground undergoing cycles of freezing and thawing using exclusively time-lapse geoelectrical measurements collected from the ground surface. The method links a heat conduction model with a ground resistivity model in a fully coupled optimization approach. The data used for model calibration come from a high-latitude permafrost monitoring site in Ilulissat, West Greenland. Parameters calibrated on time-lapse geoelectrical data reproduce the calibration dataset with an accuracy comparable to that of a calibration on borehole temperature data, and reproduce the observed borehole temperatures to within ±0.6 °C. Given the underdetermined nature of the inverse problem and the simplicity of the heat model, the parameter values are non-uniquely determined in both calibration approaches. Nevertheless, the method offers the possibility of gaining an outlook of ground thermal conditions over a larger area, at lower cost and with reduced impact on the fragile arctic environment.",
keywords = "Geoelectrical monitoring, Coupled inversion, Permafrost, Time-lapse ERT, Heat transfer",
author = "Sona Tomaskovicova and Thomas Ingeman-Nielsen",
year = "2018",
language = "English",
pages = "910--911",
note = "5th European Conference on Permafrost, EUCOP5 ; Conference date: 23-06-2018 Through 01-07-2018",

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Tomaskovicova, S & Ingeman-Nielsen, T 2018, 'Coupled thermo-geophysical inversion for permafrost monitoring', Paper presented at 5th European Conference on Permafrost, Chamonix-Mont-Blanc, France, 23/06/2018 - 01/07/2018 pp. 910-911.

Coupled thermo-geophysical inversion for permafrost monitoring. / Tomaskovicova, Sona; Ingeman-Nielsen, Thomas.

2018. 910-911 Paper presented at 5th European Conference on Permafrost, Chamonix-Mont-Blanc, France.

Research output: Contribution to conferencePaperResearchpeer-review

TY - CONF

T1 - Coupled thermo-geophysical inversion for permafrost monitoring

AU - Tomaskovicova, Sona

AU - Ingeman-Nielsen, Thomas

PY - 2018

Y1 - 2018

N2 - We describe an approach to calibrating the thermal parameters of a ground undergoing cycles of freezing and thawing using exclusively time-lapse geoelectrical measurements collected from the ground surface. The method links a heat conduction model with a ground resistivity model in a fully coupled optimization approach. The data used for model calibration come from a high-latitude permafrost monitoring site in Ilulissat, West Greenland. Parameters calibrated on time-lapse geoelectrical data reproduce the calibration dataset with an accuracy comparable to that of a calibration on borehole temperature data, and reproduce the observed borehole temperatures to within ±0.6 °C. Given the underdetermined nature of the inverse problem and the simplicity of the heat model, the parameter values are non-uniquely determined in both calibration approaches. Nevertheless, the method offers the possibility of gaining an outlook of ground thermal conditions over a larger area, at lower cost and with reduced impact on the fragile arctic environment.

AB - We describe an approach to calibrating the thermal parameters of a ground undergoing cycles of freezing and thawing using exclusively time-lapse geoelectrical measurements collected from the ground surface. The method links a heat conduction model with a ground resistivity model in a fully coupled optimization approach. The data used for model calibration come from a high-latitude permafrost monitoring site in Ilulissat, West Greenland. Parameters calibrated on time-lapse geoelectrical data reproduce the calibration dataset with an accuracy comparable to that of a calibration on borehole temperature data, and reproduce the observed borehole temperatures to within ±0.6 °C. Given the underdetermined nature of the inverse problem and the simplicity of the heat model, the parameter values are non-uniquely determined in both calibration approaches. Nevertheless, the method offers the possibility of gaining an outlook of ground thermal conditions over a larger area, at lower cost and with reduced impact on the fragile arctic environment.

KW - Geoelectrical monitoring

KW - Coupled inversion

KW - Permafrost

KW - Time-lapse ERT

KW - Heat transfer

M3 - Paper

SP - 910

EP - 911

ER -

Tomaskovicova S, Ingeman-Nielsen T. Coupled thermo-geophysical inversion for permafrost monitoring. 2018. Paper presented at 5th European Conference on Permafrost, Chamonix-Mont-Blanc, France.