Surface electrical resistivity in coastal groundwater exploration

Urish, Daniel W.; Frohlich, Reinhard K.

doi:10.1016/0016-7142(90)90008-g

Cited by 88 publications

(36 citation statements)

References 14 publications

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“…Various researchers are found in the literature, exploiting direct current geoelectrical methods competence in groundwater salinization investigations around the world. Examples of one dimensional soundings include: Urish and Frohlich (1990);Frohlich et al (1994); Ebraheem et al (1997); Nowroozi et al (1999);Choudhury et al (2001); Edet and Okereke (2001); Sherif et al (2006);and Adepelumi et al (2009). In all the aforementioned studies, the authors were able to successfully distinguish between freshwater and saltwater domains in various geological environments, by combining the results of numerous Vertical Electrical Soundings (VES) across coastal zones.…”

Section: Introductionmentioning

confidence: 95%

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: 95%

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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“…The more conductive zone of the ERT may be evidencing the effect of a salty lagoon water wedge into the alluvial fan (Urish and Frohlich, 1990). The resistivity of the water depends on the concentration and type of dissolved minerals and salts (Lowrie, 2007, pp.…”

Section: Discussionmentioning

confidence: 99%

Local influences of geothermal anomalies on permafrost distribution in an active volcanic island (Deception Island, Antarctica)

et al. 2014

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This study aims at understanding the spatial distribution and characteristics of the frozen and unfrozen terrain in an alluvial fan on Deception Island, which is an active strato-volcano located in the Bransfield Strait (South Shetland Islands) with recent eruptions in 1967, 1969 and 1970. The alluvial fan is dominated by debris-flow, run-off and rock fall processes and permafrost occurs in several parts in the vicinity of anomalous geothermal heat flux. The aim is to assess the ways volcanic activity controls permafrost development and associated geomorphic dynamics using shallow subsurface, surface and air temperature measurements as well as thaw depth and electrical resistivity tomography (ERT) surveys. Results show a temperature increase with depth in the lower part of the fan reaching 13°C at 0.80 m depth, without the presence of permafrost. The shallow borehole located at this site showed a stable thermal stratification all year-round, with only the upper 0.20 m reacting to meteorological forcing. In the upper part of the alluvial fan and debris cones, c. 100 m from the coast, frozen ground is present at c. 0.70 m depth. There, the shallow borehole shows a good coupling with air temperatures and the thermal regime favours the presence of permafrost. ERT shows the lowest resistivity values in the lower part of the alluvial fan and a highly resistivity zone in the upper sector of the fan and in the debris cones. These large variations in resistivity mark the presence of a saline water wedge from the sea into the fan, reaching frozen ground conditions about 100 m inland. It can be shown that the volcano-hydrothermal activity only inhibits frost development very locally, with frozen ground conditions occurring about 100 m away.

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“…The applicability of above mentioned tool for demarcation of the saline water-freshwater interface is due to its capability to discriminate the large resistivity contrast between the salt water and the fresh water. The resistivity tool has been successfully used to demarcate the saltwater-freshwater interface in different coastal settings worldwide (Bugg and Lloyd 1976;Urish and Frohlich 1990;Vandam and Meulankamp 1967;Zohdy 1969;Ginsberg and Levanton 1976;Frohlich et al 1994;Nowroozi et al 1999;Choudhury et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Sea water intrusion studies near Kovaya limestone mine, Saurashtra coast, India

Pujari

Soni

2008

Environ Monit Assess

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The Kovaya Limestone Mine is situated on the Saurashtra coast of India. Though the mine is dependent on the desalination plant installed in the plant for its domestic and industrial water requirements, there is significant withdrawal of groundwater by the large number of bore wells and open wells, which are present in the agricultural fields lying in and around the leased area of the mine. The heavy withdrawal of groundwater has led to intrusion of seawater. The present work entails study of possible seawater intrusion by chemical analysis of major cations and anions in selected groundwater samples. Very high total dissolved solids in the range of >1,000 mg/l and high chloride in the range of 103 mg/l to 3,899 mg/l have been measured in the groundwater samples. 'Resistivity Imaging Survey' has also been carried out on selected profiles in the study area. The Electrical Resistivity Tomography images indicate very low resistivity zones (~0-3 Omega m) in the bottom portion of the resistivity depth section. These low resistivity zones can be interpreted to be due to seawater intrusion. The resistivity sections on the excavated Pits, where mining is going on, indicate possibilities of seawater intrusion. Hence, protection from seawater intrusion is recommended through restriction of mining up to the safe level.

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Surface electrical resistivity in coastal groundwater exploration

Cited by 88 publications

References 14 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

Local influences of geothermal anomalies on permafrost distribution in an active volcanic island (Deception Island, Antarctica)

Sea water intrusion studies near Kovaya limestone mine, Saurashtra coast, India

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