Contribution of electrical resistivity tomography to the study of detrital aquifers affected by seawater intrusion–extrusion effects: The river Vélez delta (Vélez-Málaga, southern Spain)

Martínez, Julián; Benavente, J.; Aróstegui, J.L. García; Hidalgo, M. Carmen; Rey, J.

doi:10.1016/j.enggeo.2009.07.004

Cited by 96 publications

(41 citation statements)

References 16 publications

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“…Among them, the geophysical methods present significant advantages over the geochemical ones, since they involve lower cost and less time in their application (Maillet et al, 2005). Another critical advantage is that they are non-destructive and that they incorporate the ability to produce continuous datasets over large areas, while geochemical analyses are limited only to points of interest where boreholes exist (Martínez et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…In certain occasions (Wilson et al, 2006), the ERT technique was used in order to supplement and clarify the results of initially executed one dimensional VES in the same region. The efficiency of the ERT technique in a variety of inshore geological settings is demonstrated by various researchers, including coastal alluvial aquifers (Abdul Nassir et al, 2000;Morrow et al, 2010;Ebraheem et al, 2012;Mas-Pla et al, 2012), coastal deltaic deposits (Maillet et al, 2005;Martínez et al, 2009;Gurunadha Rao et al, 2011), or inland saline environments, e.g., in the Okavango Delta, Botswana (Bauer et al, 2006), in the Dead Sea, Jordan aquifer (Batayneh, 2006), and in Querenca-Silves, south Portugal (Leitão et al, 2014). These authors have utilized various array configurations and electrode spacing intervals, and showed that the method is able to provide a good correlation between specific resistivity values and hydrogeological properties, and thus, to calculate formation factors (Archie, 1942) for the separate aquifer units, by combining groundwater electrical resistivity measurements and bulk formation resistivity distribution.…”

Section: Introductionmentioning

confidence: 99%

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Large Scale Electrical Resistivity Tomography Survey Correlated to Hydrogeological Data for Mapping Groundwater Salinization: A Case Study from a Multilayered Coastal Aquifer in Rhodope, Northeastern Greece

et al. 2015

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A large scale two dimensional electrical resistivity survey was carried out to investigate groundwater salinization phenomena of a multilayered coastal aquifer in south Rhodope area, northeastern Greece. The electrical resistivity tomography (ERT) profiles, calibrated with lithological, physicochemical and geophysical log data, were used to demarcate the geometry of the aquifer system and characterize the extent of the interface between saline and freshwater in a coastal groundwater system, which has been subject to overexploitation for the last 35 years. In total, 12 deep high resolution ERT profile lines, covering a distance of approximately 15 km were carried out at key locations across the downgraded part of the aquifer system. The resistivity sections were calibrated using a reference dataset of 45 information wells incorporating 28 lithological logs, 31 groundwater quality samples from a variety of screen placements and five gamma ray logs. Results revealed the presence of four major resistivity zones ranging in values between 0.1 and 150 Ωm at various depths and locations. A very low resistivity zone (0.1-5 Ωm) correlated with saline water saturated layers, a medium resistivity zone (5-15 Ωm) attributed to clays and silts, and two high resistivity zones generally representing freshwater saturated sediments of coarse grain size (15-40 Ωm) or alterations of thin marl and fine sand layers (40-150 Ωm). It is demonstrated that extensive use of high resolution deep geoelectrical sections, calibrated with a large number of hydrogeological data can successfully delineate aquifer geometry dimensions, identify hydraulic boundaries and clarify ambiguous field measurements, thus allowing the development of a thorough hydrogeological conceptual model.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large Scale Electrical Resistivity Tomography Survey Correlated to Hydrogeological Data for Mapping Groundwater Salinization: A Case Study from a Multilayered Coastal Aquifer in Rhodope, Northeastern Greece

et al. 2015

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“…This technique has numerous possible applications when one is faced with various problems in different geological settings (Caputo et al, 2003;Colella et al, 2004). It is increasingly used in environmental studies, hydrogeology (Maillet et al 2005;Š umanovac, 2006;Martínez et al, 2009), and geotechnics (Naudet et al, 2008), among other fields. This technique has also been used for detection of natural crevice-type caves (van Schoor, 2002;Gutiérrez et al, 2009;Pá nek et al, 2010;Gambetta et al, 2011) and in some cases, to locate manmade mining cavities (Maillol et al, 1999;Martínez-Ló pez et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Electrical Tomography Applied to the Detection of Subsurface Cavities

Martines-López¹,

Rey²,

Dueñas³

et al. 2013

JCKS

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Abstract:We have analyzed the geoelectric response produced by three cavities cut into different geological substrata of granite, phyllite, and sandstone that had previously been characterized by direct methods. We also examined a mining void excavated in granite. In each case, we applied three different geoelectric arrays (Wenner-Schlumberger, Wenner and dipole-dipole) and several inter-electrode spacings. The survey results suggest that electrical resistivity tomography is a viable geophysical tool for the detection and monitoring of mining voids and other subsurface cavities. The results vary depending on a wide range of factors, such as the depth and diameter of the cavity, the multi-electrode array used, the inter-electrode spacing, the geological model, and the density of the data. The resolution capacity of the Wenner-Schlumberger array for the detection of these cavities was greater than that of the Wenner array and slightly better than the dipole-dipole. There is a direct relationship between inter-electrode spacing and diameter of the cavity. In general, we observed a loss of resolution as the distance between the electrodes increased. The most efficient detection was achieved when the inter-electrodes distance was less than or equal to the diameter of the cavity itself. In addition, cavity detection became increasingly less precise with its depth beneath the surface. Cavities with a radius of about 1.5 m were located by both the WennerSchlumberger method and the dipole-dipole at depths of more than 4.6 m, which means that prospecting can be carried out at depths 3 times the radius of the cavity.

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“…Information from the local geology, drilling reports, and pumping tests are the most common methods for determining these physical properties. However, these techniques are time demanding and provide punctual data, therefore they could be used in combination with geophysical methods to save time and generate continuous data along a profile [6,7].…”

Section: Introductionmentioning

confidence: 99%

Electrical Resistivity Tomography and Induced Polarization for Mapping the Subsurface of Alluvial Fans: A Case Study in Punata (Bolivia)

et al. 2016

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Conceptual models of aquifer systems can be refined and complemented with geophysical data, and they can assist in understanding hydrogeological properties such as groundwater storage capacity. This research attempts to use geoelectrical methods, Electrical Resistivity Tomography and Induced Polarization parameters, for mapping the subsurface in alluvial fans and to demonstrate its applicability; the Punata alluvial fan was used as a case study. The resistivity measurements proved to be a good tool for mapping the subsurface in the fan, especially when used in combination with Induced Polarization parameters (i.e., Normalized Chargeability). The Punata alluvial fan characterization indicated that the top part of the subsurface is composed of boulders in a matrix of finer particles and that the grain size decreases with depth; the electrical resistivity of these deposits ranged from 200 to 1000 Ωm, while the values of normalized chargeability were lower than 0.05 mS/m. The bottom of the aquifer system consisted of a layer with high clay content, and the resistivity ranged from 10 to 100 Ωm, while the normalized chargeability is higher than 0.07 mS/m. With the integration of these results and lithological information, a refined conceptual model is proposed; this model gives a more detailed description of the local aquifer system. It can be concluded that geoelectrical methods are useful for mapping aquifer systems in alluvial fans.

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Contribution of electrical resistivity tomography to the study of detrital aquifers affected by seawater intrusion–extrusion effects: The river Vélez delta (Vélez-Málaga, southern Spain)

Cited by 96 publications

References 16 publications

Large Scale Electrical Resistivity Tomography Survey Correlated to Hydrogeological Data for Mapping Groundwater Salinization: A Case Study from a Multilayered Coastal Aquifer in Rhodope, Northeastern Greece

Large Scale Electrical Resistivity Tomography Survey Correlated to Hydrogeological Data for Mapping Groundwater Salinization: A Case Study from a Multilayered Coastal Aquifer in Rhodope, Northeastern Greece

Electrical Tomography Applied to the Detection of Subsurface Cavities

Electrical Resistivity Tomography and Induced Polarization for Mapping the Subsurface of Alluvial Fans: A Case Study in Punata (Bolivia)

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