Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR

Mud walls are frequent in many archaeological sites, including sites located in semi-desert regions. In cases with buried walls, the geophysical methods can be useful tools for their investigation, since they provide maps of the subsoil in a non-invasive way and in relatively short times. This artic...

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Autores principales: Bongiovanni, M.V., de la Vega, M., Bonomo, N.
Formato: JOUR
Materias:
3D resistivity modeling
Ground penetrating radar
Mud walls
Palo Blanco site
Resistivity method
archaeological evidence
computer simulation
electrical resistivity
geophysical method
ground penetrating radar
subsoil
three-dimensional modeling
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03054403_v38_n9_p2243_Bongiovanni
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03054403_v38_n9_p2243_Bongiovanni
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spelling todo:paper_03054403_v38_n9_p2243_Bongiovanni2023-10-03T15:21:43Z Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR Bongiovanni, M.V. de la Vega, M. Bonomo, N. 3D resistivity modeling Ground penetrating radar Mud walls Palo Blanco site Resistivity method archaeological evidence computer simulation electrical resistivity geophysical method ground penetrating radar subsoil three-dimensional modeling Mud walls are frequent in many archaeological sites, including sites located in semi-desert regions. In cases with buried walls, the geophysical methods can be useful tools for their investigation, since they provide maps of the subsoil in a non-invasive way and in relatively short times. This article deals with the characterization of mud walls in very dry soils through the resistivity method, discussing a methodology to satisfactorily apply the method in this kind of adverse environment and how to interpret the results. The case of the Palo Blanco archaeological site, a pre-Incaic village located in the NW region of Argentina, is analyzed.In very dry soils, it is frequent that the electrical current cannot be injected due to the high values of electrical resistivity at the shallowest portions of soil, which makes the resistivity method useless. Here we show how this problem can be systematically overcome by wetting a shallow thread between each pair of injection electrodes, and the manner in which the resulting profiles can be analyzed. We perform numerical simulations of the resistivity profiles considering 3D models of mud walls and wetted threads that reproduce experimental situations, and compare them to 2D field data. The resistivity profiles are analyzed for different orientations and distances between the wall and profile, and fluctuations of the soil parameters. The experimental profiles are interpreted from these simulations and compared to ground penetrating radar (GPR) profiles. The resistivity methodology shows effective for characterizing the size and depth of the mud walls, even in cases with collapsed or much eroded walls, for which GPR often fails. © 2011 Elsevier Ltd. Fil:Bongiovanni, M.V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:de la Vega, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bonomo, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03054403_v38_n9_p2243_Bongiovanni
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 3D resistivity modeling
Ground penetrating radar
Mud walls
Palo Blanco site
Resistivity method
archaeological evidence
computer simulation
electrical resistivity
geophysical method
ground penetrating radar
subsoil
three-dimensional modeling
spellingShingle 3D resistivity modeling
Ground penetrating radar
Mud walls
Palo Blanco site
Resistivity method
archaeological evidence
computer simulation
electrical resistivity
geophysical method
ground penetrating radar
subsoil
three-dimensional modeling
Bongiovanni, M.V.
de la Vega, M.
Bonomo, N.
Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
topic_facet 3D resistivity modeling
Ground penetrating radar
Mud walls
Palo Blanco site
Resistivity method
archaeological evidence
computer simulation
electrical resistivity
geophysical method
ground penetrating radar
subsoil
three-dimensional modeling
description Mud walls are frequent in many archaeological sites, including sites located in semi-desert regions. In cases with buried walls, the geophysical methods can be useful tools for their investigation, since they provide maps of the subsoil in a non-invasive way and in relatively short times. This article deals with the characterization of mud walls in very dry soils through the resistivity method, discussing a methodology to satisfactorily apply the method in this kind of adverse environment and how to interpret the results. The case of the Palo Blanco archaeological site, a pre-Incaic village located in the NW region of Argentina, is analyzed.In very dry soils, it is frequent that the electrical current cannot be injected due to the high values of electrical resistivity at the shallowest portions of soil, which makes the resistivity method useless. Here we show how this problem can be systematically overcome by wetting a shallow thread between each pair of injection electrodes, and the manner in which the resulting profiles can be analyzed. We perform numerical simulations of the resistivity profiles considering 3D models of mud walls and wetted threads that reproduce experimental situations, and compare them to 2D field data. The resistivity profiles are analyzed for different orientations and distances between the wall and profile, and fluctuations of the soil parameters. The experimental profiles are interpreted from these simulations and compared to ground penetrating radar (GPR) profiles. The resistivity methodology shows effective for characterizing the size and depth of the mud walls, even in cases with collapsed or much eroded walls, for which GPR often fails. © 2011 Elsevier Ltd.
format JOUR
author Bongiovanni, M.V.
de la Vega, M.
Bonomo, N.
author_facet Bongiovanni, M.V.
de la Vega, M.
Bonomo, N.
author_sort Bongiovanni, M.V.
title Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
title_short Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
title_full Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
title_fullStr Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
title_full_unstemmed Contribution of the resistivity method to characterize mud walls in a very dry region and comparison with GPR
title_sort contribution of the resistivity method to characterize mud walls in a very dry region and comparison with gpr
url http://hdl.handle.net/20.500.12110/paper_03054403_v38_n9_p2243_Bongiovanni
work_keys_str_mv AT bongiovannimv contributionoftheresistivitymethodtocharacterizemudwallsinaverydryregionandcomparisonwithgpr
AT delavegam contributionoftheresistivitymethodtocharacterizemudwallsinaverydryregionandcomparisonwithgpr
AT bonomon contributionoftheresistivitymethodtocharacterizemudwallsinaverydryregionandcomparisonwithgpr
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