The development of DC resistivity imaging techniques

Dahlin, Torleif

doi:10.1016/s0098-3004(00)00160-6

Cited by 328 publications

(195 citation statements)

References 31 publications

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“…With this layout, the maximum depth coincides with the depth of the brine layers. Since the accuracy and resolution decrease with depth in ERT (Dahlin 2001;Loke 2010;Loke et al 2003), this might have affected the ability of ERT to resolve the low-resistivity layers. Furthermore, values of normalized chargeability increase with depth.…”

Section: Resultsmentioning

confidence: 99%

Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic: a case study in Punata, Bolivia

2018

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The semiarid Punata alluvial fan is located in the central part of Bolivia. The main activity of this region is the extensive agriculture, and groundwater is the main water supply. Local villagers who use groundwater reported that in some places groundwater has a salty taste. In order to investigate the origin of this problem, several TEM soundings were performed in the study area, and they were complemented with ERT surveys. The results show top layers with resistivity values ranging from 30 to 200 Ωm and a bottom layer with resistivity values ranging from 1 to 20 Ωm, which might be interpreted as the main aquifer and a layer with high clay content, respectively. Between the top and bottom layer, a transition zone with saline water has been identified, with resistivity values ranging from 0.1 to 1 Ωm. The origin of this closed-basin brine might be a product of the evaporation of paleolakes during the lower Pliocene, where saline clays were deposited. This study demonstrated the effectiveness of TEM sounding for mapping very low resistivity zones such as saline water.

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Section: Resultsmentioning

confidence: 99%

Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic: a case study in Punata, Bolivia

2018

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“…Electrical resistivity tomography (ERT) is one of the oldest and most commonly used geophysical methods and measures the variation of electrical resistivity in the subsurface (Dahlin, 2001). The ERT technique has evolved significantly from its basic form as 1D electrical prospecting method that was used to map vertical or horizontal layers or anomalies in the subsurface (Slichter, 1993).…”

Section: Aigbogun Co; Alile Om; Egbai Jcmentioning

confidence: 99%

Geoelectrical imaging for shallow site investigation at Ekiugbo in Uhunmwode Local Government Area of Edo State, Nigeria

Aigbogun¹,

Alile²,

Egbai³

2017

Journal of Applied Sciences and Environmental Management

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“…Extension of the survey can be achieved by a technique called "roll-along", in which a part of the original layout is shifted in the desired direction. Usually, this is a quarter of the total length of the total layout and new measurements are added to the survey (Dahlin 2001).…”

Section: Cves Measurementsmentioning

confidence: 99%

“…The method tries to reduce the differences between the resistivities measured and the calculated response of the estimated model carrying out a number of iteration steps, until satisfactory agreement between model response and field data is reached or no further improvement is possible (Dahlin 2001). The result is a two-dimensional earth profile built from mathematically modeled resistivities (Loke et al 2003).…”

Section: Cves Measurementsmentioning

confidence: 99%

Geophysical characterization of the León-Chinandega aquifer, Nicaragua

Corriols

Dahlin

2008

Hydrogeol J

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Electrical geophysical surveys in the mode of vertical electrical soundings (VES) and continuous vertical electrical soundings (CVES) were conducted in the León-Chinandega plains, northwestern Nicaragua, in order to obtain detailed information about the geometry of the different hydrogeological layers in the aquifer and depth to the basement. A total of 51 VES were carried out within the plains. The results show a complex structure towards the north east of the area, and the southwestern part of the plains presents a smoother stratification. The geoelectrical measurements and borehole information indicate that the basement topography is characterized by hills and deep valleys with highly variable basement depths. Fifty CVES where done in a smaller area in the center of the plain. The resistivity data yielded considerable information revealing the existence of two main geoelectrical units. The combined interpretation of geological and geophysical data shows an environment typical of sedimentary volcanic coastal plains. The information collected during this investigation provides valuable data for estimating the fresh-water resources of the León-Chinandega aquifer system and for development of a groundwater management plan.Résumé Des études géophysiques électriques de types sondages electriques verticaux (VES) et sondages electriques verticaux continus (CVES) ont été réalisées dans les plaines de León-Chinandega, dans le Nord-Ouest du Nicaragua, de manière à obtenir des informations détaill-ées sur la géométrie des différentes couches hydrogéolo-giques de l'aquifère ainsi que la profondeur du socle. Un total de 51 VES a été réalisé dans les plaines. Les résultats montrent une structure complexe vers le Nord-Est de la zone, tandis que la partie Sud-Ouest des plaines présente une stratification plus douce. Les mesures géo-électriques et les informations des forages indiquent que la topographie du socle est caractérisée par des collines et des vallées profondes avec des élévations du socle très variables. Cinquante CVES ont été réalisés dans une zone plus petite au centre de la plaine. Les données de résistivité ont apporté des informations considérables révélant l'existence de deux unités géo-électriques principales. L'interprétation combinée des données géologiques et géophysiques caractérise un environnement typique de plaines côtières sédimentaires volcaniques. L'information collectée lors de cette étude apporte des données qui peuvent servir à l'estimation des ressources en eau douce du système aquifère de León-Chinandega et à l'élabora-tion d'un plan de gestion des eaux souterraines.Resumen Estudios geoelectricos en la modalidad de sondeos eléctricos verticales (SEV) y sondeos eléctricos verticales continuos (SEVC) fueron realizados en la planicie de León-Chinandega, nor-oeste de Nicaragua, para obtener información detallada de la geometría de las diferentes capas hidrogeológicas en el acuífero y la profundidad al basamento. Un total de 51 SEV fueron realizados en la planicie. Los resultados muestran u...

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The development of DC resistivity imaging techniques

Cited by 328 publications

References 31 publications

Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic: a case study in Punata, Bolivia

Delimiting a saline water zone in Quaternary fluvial–alluvial deposits using transient electromagnetic: a case study in Punata, Bolivia

Geoelectrical imaging for shallow site investigation at Ekiugbo in Uhunmwode Local Government Area of Edo State, Nigeria

Geophysical characterization of the León-Chinandega aquifer, Nicaragua

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