Hydrogeophysical Characteristics of Pan-African Aquifer Specified Through an Alternative Approach Based on the Interpretation of Vertical Electrical Sounding Data in the Adamawa Region, Central Africa

<span style="font-size: 10.5pt; font-family: 'Times New Roman','serif'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA;" lang="EN-US">Vertical electrical sounding was done at 47 points using an ABEM 1000 Terrameter and a set of cables that could probe up to a depth of 500m. Resistivity was determined in two sites located in the district of Douala III (Bomkoul and Ngoma) 6 km west of the main town on the left bank of the Wouri River. The choice of these neighbourhood is as a result on the one hand, the presence of clay deposits from which sections have helped to configure resistivity data with those of geoelectric sections, and on the other hand, by the ability to extend the measuring device over great distances without being hindered by urbanization. The depths of investigation range from a minimum of 30 m and a maximum of 120 m. The results show a wide variability in resistivity values throughout the study area; it may be related to the high variability of facies described on sections by diggers. This variability may be due to the complexity of deposits recorded in the Douala sedimentary basin and also because of the presence of water in both sandy and clay sediments due to climate. The suggested resistivity is between 20 and 600ohm.m for clays and greater than 1000 ohm.m for sand. Given the weak thickness of some layers, the cancellation phenomena that affect very thin layers between two layers of different geoelectric properties of the latter have been observed, thus assigning to clay layers, sand resistivity.</span>

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STUDYING FROZEN CROSS-SECTIONS IN YAKUTIA USING NEAR-FIELD TRANSIENT ELECTROMAGNETIC SOUNDING AND INDUCED POLARIZATION VERTICAL ELECTRICAL SOUNDING

Engineering Geology World ◽

10.25296/1993-5056-2017-2-64-69 ◽

2017 ◽

pp. 64-69 ◽

Cited By ~ 1

Author(s):

V. V. Ageev ◽

D. V. Ageev

Keyword(s):

Cross Sections ◽

Near Field ◽

Induced Polarization ◽

Vertical Electrical Sounding ◽

Electromagnetic Sounding ◽

Transient Electromagnetic ◽

Electrical Sounding

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Ground-water exploration in the South Kohala district, Hawaii County, Hawaii, using vertical electrical sounding

Open-File Report ◽

10.3133/ofr8367 ◽

1983 ◽

Cited By ~ 1

Author(s):

James P. Kauahikaua ◽

Dallas B. Jackson

Keyword(s):

Ground Water ◽

Vertical Electrical Sounding ◽

The South ◽

Electrical Sounding

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A LOW-COST RESISTIVIMETER FOR USE IN PRACTICAL LECTURES OF APPLIED GEOPHYSICS

Brazilian Journal of Geophysics ◽

10.22564/rbgf.v34i1.778 ◽

2016 ◽

Vol 34 (1) ◽

Author(s):

Walter Sydney Dutra Folly ◽

Aracy Sousa Senra

Keyword(s):

Electrical Resistivity ◽

Low Cost ◽

Test Area ◽

Vertical Electrical Sounding ◽

Applied Geophysics ◽

Resistivity Profile ◽

Electrical Sounding ◽

Good Agreement

ABSTRACT. We describe the construction and testing of a simple and efficient low-cost resistivimeter designed for use in practical classes in Applied Geophysics. The equipment was successfully tested in a vertical electrical sounding (VES) performed on sandy terrain within the campus of the Universidade Federal de Sergipe, Brazil. The VES results were in good agreement with the profiles obtained from two boreholes located approximately 500 m from the test area, clearly demonstrating the efficiency of the equipment and the adopted methodology.Keywords: vertical electrical sounding, electrical resistivity, resistivity profile. RESUMO. Neste artigo, descrevemos a construção e o teste de um resistivímetro de baixo custo, simples e eficiente, concebido para ser utilizado em aulas práticas de Geofísica Aplicada. O equipamento foi testado com a realização de uma sondagem elétrica vertical (SEV) em um terreno arenoso localizado no campus da Universidade Federal de Sergipe, Brasil. Os resultados obtidos nesta SEV apresentaram boa concordância com os perfis observados em dois poços de sondagem localizados a 500 m da área de teste, fato que comprovou a eficiência do equipamento e da metodologia adotada.Palavras-chave: sondagem elétrica vertical, resistividade elétrica, perfil de resistividade.

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