Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger
International audience We use a basket geothermal heat exchanger during 518 hr to freeze a portion of soil. This field experiment is monitored using time lapse electrical conductivity tomography and a set of 47 in situ temperature sensors. A frozen soil core characterized by negative temperatures an...
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ftunivsavoie:oai:HAL:hal-03005869v1 2024-09-15T18:11:40+00:00 Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger Coperey, A Revil, A Stutz, B Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2019-12-17 https://hal.science/hal-03005869 https://hal.science/hal-03005869/document https://hal.science/hal-03005869/file/2019-GRL-Basket%20heat%20exchanger.pdf https://doi.org/10.1029/2019gl084962 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2019gl084962 hal-03005869 https://hal.science/hal-03005869 https://hal.science/hal-03005869/document https://hal.science/hal-03005869/file/2019-GRL-Basket%20heat%20exchanger.pdf doi:10.1029/2019gl084962 info:eu-repo/semantics/OpenAccess ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03005869 Geophysical Research Letters, 2019, 46, pp.14531 - 14538. ⟨10.1029/2019gl084962⟩ [SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftunivsavoie https://doi.org/10.1029/2019gl084962 2024-07-08T23:40:26Z International audience We use a basket geothermal heat exchanger during 518 hr to freeze a portion of soil. This field experiment is monitored using time lapse electrical conductivity tomography and a set of 47 in situ temperature sensors. A frozen soil core characterized by negative temperatures and low conductivity values (<10 −3 S/m) develops over time. A petrophysical model describing the temperature dependence of the electrical conductivity in freezing conditions is applied to the field data and compared to two laboratory experiments performed with two core samples from the test site. The results show that this petrophysical model can be used to interpret field measurements bridging electrical conductivity to temperature and liquid water content. Plain Language Summary In order to better understand the evolution of permafrost (spatial extent, temperature, and liquid water content distributions), we can use time lapse electrical conductivity tomography. The electrical conductivity of a soil is influenced by water and ice contents, temperature, salinity of the pore water, and the cation exchange capacity of the material. We test a physics-based relationship connecting temperature, ice content, and electrical conductivity. This relationship is tested on two core samples and compared with field observations during a in-situ test experiment. In this experiment, we generated a frozen soil core using a geothermal heat exchanger, and at the same time, we recorded the temperature and electrical conductivity distributions. We found a good consistency between the field data and the model, which means that from the distribution of the electrical conductivity of the frozen soil, we are able to recover its temperature. Article in Journal/Newspaper Ice permafrost Université Savoie Mont Blanc: HAL Geophysical Research Letters 46 24 14531 14538 |
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Université Savoie Mont Blanc: HAL |
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English |
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[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
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[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] Coperey, A Revil, A Stutz, B Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
topic_facet |
[SDE]Environmental Sciences [SDU]Sciences of the Universe [physics] |
description |
International audience We use a basket geothermal heat exchanger during 518 hr to freeze a portion of soil. This field experiment is monitored using time lapse electrical conductivity tomography and a set of 47 in situ temperature sensors. A frozen soil core characterized by negative temperatures and low conductivity values (<10 −3 S/m) develops over time. A petrophysical model describing the temperature dependence of the electrical conductivity in freezing conditions is applied to the field data and compared to two laboratory experiments performed with two core samples from the test site. The results show that this petrophysical model can be used to interpret field measurements bridging electrical conductivity to temperature and liquid water content. Plain Language Summary In order to better understand the evolution of permafrost (spatial extent, temperature, and liquid water content distributions), we can use time lapse electrical conductivity tomography. The electrical conductivity of a soil is influenced by water and ice contents, temperature, salinity of the pore water, and the cation exchange capacity of the material. We test a physics-based relationship connecting temperature, ice content, and electrical conductivity. This relationship is tested on two core samples and compared with field observations during a in-situ test experiment. In this experiment, we generated a frozen soil core using a geothermal heat exchanger, and at the same time, we recorded the temperature and electrical conductivity distributions. We found a good consistency between the field data and the model, which means that from the distribution of the electrical conductivity of the frozen soil, we are able to recover its temperature. |
author2 |
Environnements, Dynamiques et Territoires de Montagne (EDYTEM) Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Coperey, A Revil, A Stutz, B |
author_facet |
Coperey, A Revil, A Stutz, B |
author_sort |
Coperey, A |
title |
Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
title_short |
Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
title_full |
Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
title_fullStr |
Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
title_full_unstemmed |
Electrical Conductivity Versus Temperature in Freezing Conditions: A Field Experiment Using a Basket Geothermal Heat Exchanger |
title_sort |
electrical conductivity versus temperature in freezing conditions: a field experiment using a basket geothermal heat exchanger |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.science/hal-03005869 https://hal.science/hal-03005869/document https://hal.science/hal-03005869/file/2019-GRL-Basket%20heat%20exchanger.pdf https://doi.org/10.1029/2019gl084962 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
ISSN: 0094-8276 EISSN: 1944-8007 Geophysical Research Letters https://hal.science/hal-03005869 Geophysical Research Letters, 2019, 46, pp.14531 - 14538. ⟨10.1029/2019gl084962⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2019gl084962 hal-03005869 https://hal.science/hal-03005869 https://hal.science/hal-03005869/document https://hal.science/hal-03005869/file/2019-GRL-Basket%20heat%20exchanger.pdf doi:10.1029/2019gl084962 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2019gl084962 |
container_title |
Geophysical Research Letters |
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46 |
container_issue |
24 |
container_start_page |
14531 |
op_container_end_page |
14538 |
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1810449255446347776 |