Preliminary non-intrusive geophysical electrical resistivity tomography surveys of a mock-up scale monitoring of EBS at URL Tournemire

Research output: Contribution to journalArticle

Abstract

Geophysical Electrical Resistivity Tomography (ERT) is a promising measurement
technique for non-intrusive monitoring of Engineered Barrier System (EBS) during the operational phase of geological disposal of high-level radioactive waste. Electrical resistivity is sensitive to water content and temperature, which are the key variables characterising the response of the EBS. In order to assess the technology readiness level of the ERT technique for EBS operational monitoring, a field demonstrator has been developed at the URL in Tournemire (France) within the project 'Modern 2020'.
Preliminary ERT surveys were carried out in January and November 2017 to establish the background resistivity of the experimental area and assess the quality of electrode installation and survey protocols. Results of the surveys confirmed that the resistivity of the host rock in the demonstrator area is quite homogeneous and lower than 100Ωm in accordance with independent measurements carried out in previous campaigns. In addition, the lesson learned from the blank tests allowed identifying key requirements for effective ERT measurements. These include the need for a 3D electrode configuration, bespoke measurement protocols designed on the basis of sensitivity
analysis of geometric factors, and collection of reciprocal data for enhanced data
quality control.
LanguageEnglish
Number of pages37
JournalGeological Society Special Publications
StateAccepted/In press - 28 Jul 2018

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tomography
Tomography
Websites
electrical resistivity
Monitoring
monitoring
Network protocols
Electrodes
Radioactive wastes
Waste disposal
electrode
Water content
Sensitivity analysis
Quality control
Rocks
data quality
quality control
radioactive waste
host rock
sensitivity analysis

Keywords

  • electrical resistivity tomography
  • engineered barrier system
  • monitoring
  • non-instrusive
  • geological disposal

Cite this

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title = "Preliminary non-intrusive geophysical electrical resistivity tomography surveys of a mock-up scale monitoring of EBS at URL Tournemire",
abstract = "Geophysical Electrical Resistivity Tomography (ERT) is a promising measurementtechnique for non-intrusive monitoring of Engineered Barrier System (EBS) during the operational phase of geological disposal of high-level radioactive waste. Electrical resistivity is sensitive to water content and temperature, which are the key variables characterising the response of the EBS. In order to assess the technology readiness level of the ERT technique for EBS operational monitoring, a field demonstrator has been developed at the URL in Tournemire (France) within the project 'Modern 2020'.Preliminary ERT surveys were carried out in January and November 2017 to establish the background resistivity of the experimental area and assess the quality of electrode installation and survey protocols. Results of the surveys confirmed that the resistivity of the host rock in the demonstrator area is quite homogeneous and lower than 100Ωm in accordance with independent measurements carried out in previous campaigns. In addition, the lesson learned from the blank tests allowed identifying key requirements for effective ERT measurements. These include the need for a 3D electrode configuration, bespoke measurement protocols designed on the basis of sensitivityanalysis of geometric factors, and collection of reciprocal data for enhanced dataquality control.",
keywords = "electrical resistivity tomography, engineered barrier system, monitoring, non-instrusive, geological disposal",
author = "Lopes, {Bruna de Carvalho Faria Lima} and C{\'e}dric Sachet and Phillippe Sentenac and Vojtěch Beneš and Pierre Dick and Johan Bertrand and Alessandro Tarantino",
year = "2018",
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language = "English",
journal = "Geological Society Special Publications",
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AU - Lopes,Bruna de Carvalho Faria Lima

AU - Sachet,Cédric

AU - Sentenac,Phillippe

AU - Beneš,Vojtěch

AU - Dick,Pierre

AU - Bertrand,Johan

AU - Tarantino,Alessandro

PY - 2018/7/28

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N2 - Geophysical Electrical Resistivity Tomography (ERT) is a promising measurementtechnique for non-intrusive monitoring of Engineered Barrier System (EBS) during the operational phase of geological disposal of high-level radioactive waste. Electrical resistivity is sensitive to water content and temperature, which are the key variables characterising the response of the EBS. In order to assess the technology readiness level of the ERT technique for EBS operational monitoring, a field demonstrator has been developed at the URL in Tournemire (France) within the project 'Modern 2020'.Preliminary ERT surveys were carried out in January and November 2017 to establish the background resistivity of the experimental area and assess the quality of electrode installation and survey protocols. Results of the surveys confirmed that the resistivity of the host rock in the demonstrator area is quite homogeneous and lower than 100Ωm in accordance with independent measurements carried out in previous campaigns. In addition, the lesson learned from the blank tests allowed identifying key requirements for effective ERT measurements. These include the need for a 3D electrode configuration, bespoke measurement protocols designed on the basis of sensitivityanalysis of geometric factors, and collection of reciprocal data for enhanced dataquality control.

AB - Geophysical Electrical Resistivity Tomography (ERT) is a promising measurementtechnique for non-intrusive monitoring of Engineered Barrier System (EBS) during the operational phase of geological disposal of high-level radioactive waste. Electrical resistivity is sensitive to water content and temperature, which are the key variables characterising the response of the EBS. In order to assess the technology readiness level of the ERT technique for EBS operational monitoring, a field demonstrator has been developed at the URL in Tournemire (France) within the project 'Modern 2020'.Preliminary ERT surveys were carried out in January and November 2017 to establish the background resistivity of the experimental area and assess the quality of electrode installation and survey protocols. Results of the surveys confirmed that the resistivity of the host rock in the demonstrator area is quite homogeneous and lower than 100Ωm in accordance with independent measurements carried out in previous campaigns. In addition, the lesson learned from the blank tests allowed identifying key requirements for effective ERT measurements. These include the need for a 3D electrode configuration, bespoke measurement protocols designed on the basis of sensitivityanalysis of geometric factors, and collection of reciprocal data for enhanced dataquality control.

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KW - engineered barrier system

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KW - geological disposal

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