Coupled thermo-geophysical inversion for permafrost monitoring
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 o...
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ftdtupubl:oai:pure.atira.dk:publications/3fffdcb5-529d-4e97-a050-e6edf1a911f7 2023-05-15T15:04:20+02:00 Coupled thermo-geophysical inversion for permafrost monitoring Tomaskovicova, Sona Ingeman-Nielsen, Thomas 2018 https://orbit.dtu.dk/en/publications/3fffdcb5-529d-4e97-a050-e6edf1a911f7 eng eng info:eu-repo/semantics/closedAccess 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 . Geoelectrical monitoring Coupled inversion Permafrost Time-lapse ERT Heat transfer conferenceObject 2018 ftdtupubl 2022-08-14T08:33:59Z 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. Conference Object Arctic Greenland Ilulissat permafrost Technical University of Denmark: DTU Orbit Arctic Greenland Ilulissat ENVELOPE(-51.099,-51.099,69.220,69.220) |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Geoelectrical monitoring Coupled inversion Permafrost Time-lapse ERT Heat transfer |
spellingShingle |
Geoelectrical monitoring Coupled inversion Permafrost Time-lapse ERT Heat transfer Tomaskovicova, Sona Ingeman-Nielsen, Thomas Coupled thermo-geophysical inversion for permafrost monitoring |
topic_facet |
Geoelectrical monitoring Coupled inversion Permafrost Time-lapse ERT Heat transfer |
description |
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. |
format |
Conference Object |
author |
Tomaskovicova, Sona Ingeman-Nielsen, Thomas |
author_facet |
Tomaskovicova, Sona Ingeman-Nielsen, Thomas |
author_sort |
Tomaskovicova, Sona |
title |
Coupled thermo-geophysical inversion for permafrost monitoring |
title_short |
Coupled thermo-geophysical inversion for permafrost monitoring |
title_full |
Coupled thermo-geophysical inversion for permafrost monitoring |
title_fullStr |
Coupled thermo-geophysical inversion for permafrost monitoring |
title_full_unstemmed |
Coupled thermo-geophysical inversion for permafrost monitoring |
title_sort |
coupled thermo-geophysical inversion for permafrost monitoring |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/3fffdcb5-529d-4e97-a050-e6edf1a911f7 |
long_lat |
ENVELOPE(-51.099,-51.099,69.220,69.220) |
geographic |
Arctic Greenland Ilulissat |
geographic_facet |
Arctic Greenland Ilulissat |
genre |
Arctic Greenland Ilulissat permafrost |
genre_facet |
Arctic Greenland Ilulissat permafrost |
op_source |
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 . |
op_rights |
info:eu-repo/semantics/closedAccess |
_version_ |
1766336129954480128 |