Mathematical aspects of polarization tomography

1994 ◽  
pp. 205-234
Author(s):  
V. A. Sharafutdinov
Keyword(s):  
Polarization Tomography

scholarly journals Temperature distribution in a permafrost-affected rock ridge from conductivity and induced polarization tomography

2020 ◽  
Author(s):  
P-A Duvillard ◽  
F Magnin ◽  
A Revil ◽  
A Legay ◽  
L Ravanel ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Temperature Distribution ◽  
Thermal State ◽  
Low Cost ◽  
Freezing Temperature ◽  
Induced Polarization ◽  
Rock Surface ◽  
European Alps ◽  
Limited Information ◽  
Polarization Tomography

Summary Knowledge of the thermal state of steep alpine rock faces is crucial to assess potential geohazards associated with the degradation of permafrost. Temperature measurements at the rock surface or in boreholes are however expensive, invasive, and provide spatially-limited information. Electrical conductivity and induced polarization tomography can detect permafrost. We test here a recently developed petrophysical model based on the use of an exponential freezing curve applied to both electrical conductivity and normalized chargeability to infer the distribution of temperature below the freezing temperature. We then apply this approach to obtain the temperature distribution from electrical conductivity and normalized chargeability field data obtained across a profile extending from the SE to NW faces of the lower Cosmiques ridge (Mont Blanc massif, Western European Alps, 3613 m a.s.l., France). The geophysical datasets were acquired both in 2016 and 2019. The results indicate that the only NW face of the rock ridge is frozen. To evaluate our results, we model the bedrock temperature across this rock ridge using CryoGRID2, a 1D MATLAB diffusive transient thermal model and surface temperature time series. The modelled temperature profile confirms the presence of permafrost in a way that is consistent with that obtained from the geophysical data. Our study offers a promising low-cost approach to monitor temperature distribution in Alpine rock walls and ridges in response to climate change.

scholarly journals Borehole resistivity and induced polarization tomography at the Canadian Shield for Mineral Exploration in north-western Sudbury

2020 ◽  
Vol 168 ◽  
pp. 00002
Author(s):  
Mosaad Ali ◽  
Shulin Sun ◽  
Wei Qian ◽  
Abdou Dodo Bohari ◽  
Dusabemariya Claire ◽  
...  
Keyword(s):  
Mineral Exploration ◽  
Three Dimensional ◽  
Induced Polarization ◽  
Canadian Shield ◽  
High Resolution Data ◽  
Polarization Tomography ◽  
Data Survey ◽  
Thick Overburden ◽  
Complex Geology ◽  
North Western

Mineral exploration in the Canadian shield is a major challenge nowadays. This is because of the thick overburden cover and complex geology. Borehole tomography using resistivity and induced polarization (BHDCIP) method has a big advantage here due to that the data is acquired underneath the cover and data quality, in general, is superior to that acquired at the surface. BHDCIP provides good resistivity and chargeability data, which can identify mineralization easily. In this study, the BHDCIP survey with high-resolution data was carried out to identify mineralization zones in the McCreedy West zone, north-western Sudbury, Ontario, Canada. Two and three-dimensional (2-D and 3-D) inversion results of three boreholes clearly revealed the mineralization zones and that harmonised with previous geological studies in the study area. The BHDCIP method provided insight and developed an informative subsurface map to identify the mineralization zones, thus proving it as a beneficial tool used for mineral exploration in complex geology with a minimal data survey and an irregular geometrical distribution.

scholarly journals Multidisciplinary Characterization of Chlorinated Solvents Contamination and In-Situ Remediation with the Use of the Direct Current Resistivity and Time-Domain Induced Polarization Tomography

Geosciences ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 487 ◽  
Author(s):  
Aristeidis Nivorlis ◽  
Torleif Dahlin ◽  
Matteo Rossi ◽  
Nikolas Höglund ◽  
Charlotte Sparrenbom
Keyword(s):  
Direct Current ◽  
Time Domain ◽  
Chlorinated Solvents ◽  
Induced Polarization ◽  
Contaminated Sites ◽  
In Situ Remediation ◽  
Polarization Tomography ◽  
Refraction Tomography

Soil contamination is a widespread problem and action needs to be taken in order to prevent damage to the groundwater and the life around the contaminated sites. In Sweden, it is estimated that more than 80,000 sites are potentially contaminated, and therefore, there is a demand for investigations and further treatment of the soil. In this paper, we present the results from a methodology applied in a site contaminated with chlorinated solvents, for characterization of the contamination in order to plan the remediation and to follow-up the initial step of in-situ remediation in an efficient way. We utilized the results from three different methods; membrane interface probe for direct measurement of the contaminant concentrations; seismic refraction tomography for investigating the depth to the bedrock interface; and direct current resistivity and time-domain induced polarization tomography to acquire a high-resolution imaging of the electrical properties of the subsurface. The results indicate that our methodology is very promising in terms of site characterization, and furthermore, has great potential for real-time geophysical monitoring of contaminated sites in the future.

scholarly journals Induced polarization tomography applied to the detection and the monitoring of leaks in embankments

2019 ◽  
Vol 254 ◽  
pp. 89-101 ◽  
Author(s):  
F. Abdulsamad ◽  
A. Revil ◽  
A. Soueid Ahmed ◽  
A. Coperey ◽  
M. Karaoulis ◽  
...  
Keyword(s):  
Induced Polarization ◽  
Polarization Tomography

Polarization tomography of tissues in early diagnostics of uterine cervix

2003 ◽  
Author(s):  
A. P. Peresunko ◽  
A. G. Ushenko ◽  
S. M. Michailov ◽  
Yu. A. Ushenko
Keyword(s):  
Uterine Cervix ◽  
Early Diagnostics ◽  
Polarization Tomography

scholarly journals Mapping geological structures in bedrock via large-scale direct current resistivity and time-domain induced polarization tomography

2017 ◽  
Vol 15 (6) ◽  
pp. 657-667 ◽  
Author(s):  
Matteo Rossi ◽  
Per-Ivar Olsson ◽  
Sara Johanson ◽  
Gianluca Fiandaca ◽  
Daniel Preis Bergdahl ◽  
...  
Keyword(s):  
Direct Current ◽  
Time Domain ◽  
Large Scale ◽  
Induced Polarization ◽  
Geological Structures ◽  
Polarization Tomography

scholarly journals Polarization tomography of metallic nanohole arrays

2005 ◽  
Vol 30 (1) ◽  
pp. 90 ◽  
Author(s):  
Erwin Altewischer ◽  
Cyriaque Genet ◽  
Martin P. van Exter ◽  
J. P. Woerdman ◽  
Paul F. A. Alkemade ◽  
...  
Keyword(s):  
Polarization Tomography ◽  
Nanohole Arrays
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