New prospects in shallow depth electrical surveying for archaeological and pedological applications

Hesse, Albert; Jolivet, Alain; Tabbagh, Alain

doi:10.1190/1.1442113

Cited by 71 publications

(50 citation statements)

References 4 publications

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“…A hybrid technique involves the use of high-pressure jets of conductive liquid injected continuously into the ground to provide galvanic coupling (Hesse et al, 1986). The major disadvantage of towed-array DC resistivity measurements is that data tend to be affected by high levels of motion-induced noise due to temporary variations in galvanic contact (Munkholm, 1996;Sørensen, 1996).…”

Section: Dynamic Measurements With Towed Arraysmentioning

confidence: 99%

“…In the case of DC resistivity, low-frequency AC or switched DC signals are commonly employed to avoid compensation for electrode self-potential (Hesse et al, 1986). For switched DC, measured voltage waveforms are then evaluated after a delay time following each flank when the potential is assumed to have reached a plateau.…”

Section: Time Scale Of the Measurement And Implications For Towing Speedmentioning

confidence: 99%

“…For dynamic DC measurements, spatial sampling at the centimeter scale therefore requires cycle times as short as 8 ms (corresponding to a frequency of 125 Hz) and the construction of resistivity meters that can make a single measurement per cycle (Hesse et al, 1986).…”

Section: Time Scale Of the Measurement And Implications For Towing Speedmentioning

confidence: 99%

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Capacitive Resistivity Imaging with Towed Arrays

Kuras

Meldrum

Beamish

et al. 2007

JEEG

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The capacitive resistivity (CR) technique is a generalization of the conventional DC resistivity method that facilitates measurements of electrical resistivity on engineered surfaces and highly resistive ground. The CR methodology allows the use of towed sensor arrays, thus enabling the rapid collection of high-resolution resistivity data. Under quasi-static conditions CR data are equivalent to galvanic DC measurements so that CR datasets can be interpreted with conventional DC inversion algorithms. In this study, we demonstrate that the methodology and fundamental parameters of the CR technique facilitate spatial sampling at the centimeter scale for towing speeds of the order of 2.5 km/h. We argue that the dipole-dipole array is the most suitable geometry for dynamic CR measurements and present example data acquired with a prototype instrument using plate-wire combinations arranged in an equatorial geometry. The information content of raw CR data is found to be dominant over towing-induced noise and a direct comparison with DC profile data shows good agreement between both techniques. Based on these findings, we show that tomographic imaging is possible using datasets acquired with moving arrays. Closer investigation of the practical aspects of towed-array capacitive resistivity imaging (CRI) highlights the similarities with galvanic multi-electrode surveys, but the different geometric constraints and sampling regime of CRI give rise to advantages (high lateral resolution) as well as disadvantages (limitations in vertical resolution). We conclude our study with recommendations for practical CRI survey procedures and present a field example where we have successfully imaged a subsurface target in 3D. Towed-array CRI is found to provide equivalent (and in some ways superior) information about the shallow subsurface when compared to DC ERT; it therefore widens the scope of electrical 4 imaging surveys to environments where the conventional methodology would be impractical.

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Section: Dynamic Measurements With Towed Arraysmentioning

confidence: 99%

Section: Time Scale Of the Measurement And Implications For Towing Speedmentioning

confidence: 99%

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Capacitive Resistivity Imaging with Towed Arrays

Kuras

Meldrum

Beamish

et al. 2007

JEEG

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“…Fast mobile devices for measuring soil electrical resistivity from the soil surface (Hesse et al, 1986;Panissod et al, 1998Panissod et al, , 1997aPanissod et al, , 1997b) allow a high spatial density of measurements to be taken with various depths of investigation (DOI). These devices proved very effective in giving geometrical soil information such as depth to the substratum (Chaplot et al, 2001;Moeys et al, 2006) or horizon thickness (Chaplot et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Multi-depth electrical resistivity survey for mapping soil units within two 3ha plots

Buvat

Thiesson²,

Michelin

et al. 2014

Geoderma

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Spatial information on soils generally results from local observations that are destructive and time consuming especially in the case of heterogeneous soils. Geophysical technics can be a great help for soil mapping since they are non-destructive and fast. Large areas can be surveyed with a high density of measurements. Electrical resistivity is particularly interesting for soil study because it covers a wide range of values (several decades) and depends on many characteristics of the soil.The main objective of this paper was to study soil spatial variability using an original approach to electrical data processing. Electrical data from a 3-depths survey, usually treated as three apparent resistivity maps, were considered as many electrical soundings each with three apparent resistivity values. The study of the vertical succession of these values led to define nine reference geophysical taxa. This taxonomy relies on a parameter which discriminates soil layers and is defined as the interval (in Ωm beyond which two successive apparent resistivity values on a sounding are considered different. Geophysical taxa mapping highlighted their spatial coherence, which was related to pedological characteristics such as the presence of a clay layer or the depth of the soil profile. The comparison between the spatial distribution of 2 geophysical taxa and a pre-existing soil map showed that the delineations of taxa clusters closely matched soil units boundaries but were much less smooth. This method allowed the assignment to each soil type of a specific apparent electrical resistivity profile which was consistent with soil profile description. The method is straightly applicable to data from other surveys, and opens the way to the development of semi-automatic soil mapping from electrical resistivity data.

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“…Today, the magnetic and electrical methods are the most used in archaeology (Hesse et al, 1986;Tabbagh, 1992;Dabas et al, 1998). Nevertheless, other geophysical methods like the electromagnetic ones, have shown very satisfactory results (Imai et al, 1987;Scollar et al, 1990;Sambuelli et al, 1999;Persson & Olofsson, 2004;Evangelista & Wedepohl, 2004).…”

Section: Introductionmentioning

confidence: 99%

Geophysical Investigations in the Old Panama Archaeological Site

Mojica

Acosta

Guérin

et al. 2007

Rev. Geol. Amér. Central

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ABSTRACT:The results of geophysical prospections in an archaeological site of hispanic type in Panama (Central America) are presented in this article. The archaeological site of Old Panama has been intensively investigated with the objective to know the space -time organization of man in the past. A magnetic prospection was developed in the central sector of the site; the rank of magnitude of the magnetic anomalies allowed the identification of certain characteristics of hispanic type and in addition, the presence of metallic devices, typical of more recent occupation times. On the other hand, the results of three electrical tomographies are presented. From these results it was possible to identify the depth of the metallic objects detected by magnetic prospection. Key words: Magnetic prospection, electrical prospection, apparent resistivity, electrical anomaly, magnetic anomaly, electrical tomography, Old Panama archaeological site. RESUMEN:En este artículo se presentan los resultados de una prospección geofísica en un sitio arqueológico de tipo hispánico en Panamá (América Central). Este lugar, conocido como sitio arqueológico de Panamá Viejo, ha sido objeto de intensivas investigaciones con el objetivo de conocer la organización espacio-temporal de su ocupación. Una prospección magnética fue desarrollada en el sector central del sitio. Los rangos de magnitud de las anomalías magnéticas facilitaron la identificación de ciertos rasgos de tipo hispánico y además, la presencia de artefactos metálicos propios de una época de ocupación más reciente. Por otro lado, se presentan los resultados de tres tomografías eléc-tricas. Con dichos resultados se logró identificar la profundidad de los objetos metálicos detectados en la prospección magnética. Palabras clave: Prospección magnética, prospección eléctrica, resistividad aparente, anomalía eléctrica, anomalía magnética, tomografía eléctrica, sitio arqueológico de Panamá Viejo.

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New prospects in shallow depth electrical surveying for archaeological and pedological applications

Cited by 71 publications

References 4 publications

Capacitive Resistivity Imaging with Towed Arrays

Capacitive Resistivity Imaging with Towed Arrays

Multi-depth electrical resistivity survey for mapping soil units within two 3ha plots

Geophysical Investigations in the Old Panama Archaeological Site

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