Audiomagnetotelluric prospecting for groundwater in the Baril coastal area, Piton de la Fournaise Volcano, Reunion Island

Geophysics ◽  
1997 ◽  
Vol 62 (3) ◽  
pp. 758-762 ◽  
Author(s):  
Michel Ritz ◽  
Marc Descloitres ◽  
Bernard Robineau ◽  
Michel Courteaud
Keyword(s):  
Salt Water ◽  
Groundwater Exploration ◽  
Degree Of Saturation ◽  
Near Surface ◽  
Vertical Electrical Soundings ◽  
Electromagnetic Soundings ◽  
Time Domain Electromagnetic ◽  
Water Salt ◽  
Electrical Soundings ◽  
Electrical Methods

Surface geophysics has been used for a number of years to solve a variety of major groundwater exploration problems in coastal and island regions. The electrical properties of near‐surface rocks are highly dependent on porosity, degree of saturation, and pore fluid resistivity (Keller and Frischknecht, 1966). Because the resistivity of the formations decreases with increasing salinity of the water content, electrical methods, such as vertical electrical soundings, time‐domain electromagnetic soundings, and audiomagnetotellurics (AMT), are well‐suited for mapping changes in groundwater salinity and, in particular, for detecting a fresh water‐salt water interface.

THE USE OF SCHLUMBERGER AND EQUATORIAL SOUNDINGS IN GROUNDWATER INVESTIGATIONS NEAR EL PASO, TEXAS

Geophysics ◽  
1969 ◽  
Vol 34 (5) ◽  
pp. 713-728 ◽  
Author(s):  
Adel A. R. Zohdy
Keyword(s):  
Salt Water ◽  
El Paso ◽  
Seismic Refraction ◽  
Careful Analysis ◽  
Groundwater Exploration ◽  
Electrical Sounding ◽  
Water Salt ◽  
Electrical Prospecting ◽  
Schlumberger Sounding ◽  
Seismic Refraction Data

Electrical soundings using the symmetric AMNB Schlumberger and the bipole‐dipole equatorial arrays were made along two profiles near El Paso, Texas, in support of a groundwater exploration program which included seismic refraction and gravity surveys. Electrode spacings ([Formula: see text] or R) reaching 12,000 ft allowed exploration to depths of about 7000 ft. Geoelectrical information on the subsurface materials was augmented by sounding with the bilateral equatorial configuration and by transforming Schlumberger curves into dipole‐polar sounding curves with formulas developed by Al’pin and by Tsekov. The bilateral equatorial sounding curves were found useful for detecting the direction of dip of highly resistive bedrocks whereas transformed sounding curves were used to evaluate the average longitudinal resistivity, and hence the depth, to the “electric basement.” A few of the Schlumberger sounding curves were either clearly or subtly distorted by nonhorizontal geologic structures. The interpretation of these sounding curves illustrates the requirement for careful analysis in processing electrical prospecting data obtained over complex geologic conditions. The interpretation of a combined Schlumberger‐equatorial sounding curve, which did not agree with the preliminary interpretation of seismic refraction data, was confirmed to be correct by data from a test well drilled to a depth of 4363 ft. The application of electrical sounding data in the El Paso area furnished valuable information on the depth to fresh‐water‐salt‐water interfaces and on the depth to highly resistive impervious bedrocks.

Salt water intrussion assessment using vertical electrical soundings, global optimisation methods and support vector machines

2009 ◽  
Author(s):  
J.L. Fernández Martínez ◽  
H.A. Kuzma ◽  
E. Garcia Gonzalo ◽  
J. Manuel Fernández Díaz ◽  
J. Paulino Fernández Alvarez ◽  
...  
Keyword(s):  
Support Vector Machines ◽  
Salt Water ◽  
Global Optimisation ◽  
Support Vector ◽  
Vertical Electrical Soundings ◽  
Vector Machines ◽  
Electrical Soundings ◽  
Optimisation Methods

ELECTRICAL RESISTIVITY METHOD APPLIED TO STUDY GROUNDWATER CONTAMINATION AROUND THE ALAGOINHAS CEMETERY, BAHIA, BRAZIL

2016 ◽  
Vol 33 (3) ◽  
Author(s):  
Eduardo M.S. Amarante ◽  
Olivar A.L. de Lima ◽  
Susana S. Cavalcanti
Keyword(s):  
Electrical Resistivity ◽  
Groundwater Contamination ◽  
Electrode Array ◽  
Hydrological Conditions ◽  
Vertical Electrical Soundings ◽  
Resistivity Method ◽  
Electrical Soundings ◽  
Electrical Resistivity Method

ABSTRACT. To investigate the subsurface geological and hydrological conditions around the area of the Alagoinhas county cemetery – Bahia State, Brazil, 38 vertical electrical soundings using Schlumberger electrode array were performed to a maximum AB/2 spacing... RESUMO. Para investigar as condições geológicas e hidrológicas da subsuperfície na área do entorno do Cemitério Municipal de Alagoinhas, Bahia, foram realizadas 38 sondagens elétricas verticais centradas em pontos acessíveis da área. As sondagens foram...

On: “Effect of tropical weathering on electrical and electromagnetic measurements” by G. J. Palacky and K. Kadekaru (GEOPHYSICS, January 1979, p. 69–88).

Geophysics ◽  
1980 ◽  
Vol 45 (7) ◽  
pp. 1205-1208
Author(s):  
B. B. Bhattacharya ◽  
P. K. Hazra
Keyword(s):  
Host Rock ◽  
Vertical Electrical Soundings ◽  
Electromagnetic Measurements ◽  
Tropical Weathering ◽  
Electrical Soundings

In this paper, the authors showed a series of electromagnetic (EM) profiles (Figure 20, p. 86) obtained from the ground follow‐up using a slingram system with a frequency of 1600 Hz and coil separation of 120 m. Measurements along all the profiles (A to E) show considerable in‐phase and quadrature anomaly. The host rock in this case is amphibolite. The vertical electrical soundings over the amphibolite (Figure 16, p. 82) indicate that the weathered amphibolite has mean thickness and resistivity of 8.5 ± 2.1 m and 29.7 ± 6.5 Ω-m, respectively. It would, therefore, be reasonable to assume that the in‐phase and quadrature anomalies have been influenced due to the presence of conducting overburden, and the response of the target in such a situation can be altogether different compared to the anomaly of the target in the presence of an insulating or highly resistive overburden.

GEOPHYSICAL INVESTIGATION OF GROUNDWATER CONTAMINATION USING DC RESISTIVITY TECHNIQUE AT THE MALE HOSTEL OF ISA KAITA COLLEGE OF EDUCATION DUTSIN-MA, KATSINA STATE, NIGERIA

2021 ◽  
Vol 4 (4) ◽  
pp. 547-560
Author(s):  
Aniefiok Akpaneno ◽  
S. Abdulwahab
Keyword(s):  
Groundwater Contamination ◽  
College Of Education ◽  
Signal Averaging ◽  
Geophysical Investigation ◽  
Dumping Site ◽  
Vertical Electrical Soundings ◽  
Electrical Conductivities ◽  
Electrical Sounding ◽  
Electrical Soundings ◽  
Sas Model

A geophysical investigation involving Vertical Electrical Sounding (VES) using the Schlumberger array was carried out at the Isa Kaita College of Education specifically at the Male Hostel. The aim of the investigation is to explore the groundwater contamination of the area with the objectives: to determine the depth to basement of the study area, to determine the aquifer thickness, to determine the depth to aquifer, to determine the conductivity of the aquifer and to determine the thickness of topsoil and its variation in resistivity. A total of four (4) vertical electrical soundings were carried out using Schlumberger configuration. Terrameter signal averaging system (SAS) model 300 was the instrument used. The survey area is dominated by mainly four layers, namely: Topsoil, Weathered basement, fractured basement. The value of VES 03 and VES 04 have high electrical conductivities which likely shows they are contaminated, The topsoil resistivity along the profile ranges from approximately 1 to 154, The depth to basement (basement topography) Varies from 4.94 m to 7.59 m, The thickness of aquifer range from  1 m to 6.8 m.  Therefore VES 02 has high Potential for groundwater because it has retaining capacity and good aquifer thickness and is therefore recommended for borehole establishment. It is recommended that the management of Isa Kaita College of Education should provide a concrete dumping site to avoid leaching of waste in ground thereby contaminating the groundwater.

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