Practical investigations of the earth resistivity method of geophysical surveying

The four electrode earth‐resistivity method is applied to the search for sand and gravel deposits in the glaciated areas of the United States. This technique differentiates between clays and granular materials enabling the prospector to outline and roughly estimate the quantities of each without test pits or bore holes. Several examples of field surveys are given.

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INVESTIGATION OF GROUNDWATER POTENTIALS IN IMAKUN OMI COMMUNITY USING ELECTRICAL RESISTIVITY METHOD

African Journal of Science and Nature ◽

10.46881/ajsn.v7i0.153 ◽

2020 ◽

Vol 7 ◽

pp. 19

Author(s):

Joseph Olakunle Coker ◽

Akindamola Julius Agbelemoge ◽

Stephen Oluwafemi Ariyo ◽

Victor Makinde ◽

Aderemi Amidu Alabi ◽

...

Keyword(s):

Electrical Resistivity ◽

Groundwater Potential ◽

High Yield ◽

Current Electrode ◽

Ogun State ◽

Resistivity Method ◽

The Earth ◽

Maximum Current ◽

Electrical Soundings ◽

Electrical Resistivity Method

Groundwater is described as the water found beneath the surface of the earth in underground streams and aquifers and has become popular as a source of drinking potable water in Nigeria due to its quality when compared to other water sources. The Electrical resistivity method was employed in Imakun Omi Community, a coastal town in Ogun Waterside Local government area of Ogun State with the aim of determining the groundwater potential of the area. A total of twenty (20) Vertical Electrical Soundings (VES) points were carried out in the area using the Schlumberger configuration with maximum current electrode separation (AB) of 300m using the ABEM SAS 1000 Terrameter. The results obtained were interpreted quantitatively and qualitatively using partial curve matching and computer iteration programs WINRESIST and SURFER 11 for the interpretation from which the reflection coefficient was computed. The groundwater potential of the rock units were evaluated and 40% of the stations show high yield, 50% of the stations show medium yield and 10% of the stations was observed to have low yield. The aquifer thicknesses are very thick with values ranging from 6.9 m to 79.3 m, hence an average of 43.1mand overburden thicknesses ranging from 9.7m to 96.5 m, with an average of 53.1m

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PEMETAAN AKUIFER AIR TANAH DI JALAN RINGROAD KELURAHAN MALENDENG DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENIS

JURNAL ILMIAH SAINS ◽

10.35799/jis.15.1.2015.6778 ◽

2015 ◽

Vol 15 (1) ◽

pp. 33 ◽

Cited By ~ 1

Author(s):

Dewi Sedana ◽

As’ari As’ari ◽

Adey Tanauma

Keyword(s):

Geophysical Method ◽

Low Resistivity ◽

Resistivity Method ◽

The Earth ◽

Groundwater Aquifers ◽

Working Principle ◽

Geoelectric Resistivity ◽

Subsurface Exploration

PEMETAAN AKUIFER AIR TANAH DI JALAN RINGROAD KELURAHAN MALENDENG DENGAN MENGGUNAKAN METODE GEOLISTRIK TAHANAN JENIS ABSTRAK Geolistrik merupakan salah satu metode geofisika yang dimanfaatkan dalam eksplorasi alam bawah permukaan. Prinsip kerja metode geolistrik adalah mempelajari aliran listrik di dalam bumi dan cara mendeteksinya di permukaan bumi. Penelitian ini bertujuan untuk memetakan akuifer Airtanah di Jalan Ringroad Kelurahan Malendeng berdasarkan resistivitas batuan bawah permukaan. Penelitian terdiri dari 4 titik sounding pada 1 lintasan dengan jarak setiap titik 40 meter. Hasil eksplorasi diolah dengan menggunakan software IP2WIN untuk melihat data perlapisan di bawah permukaan tanah berdasarkan nilai resistivitasnya (2D) dan pesebaran titik – titik terdapatnya akuifer Airtanah. Hasil penelitian menunjukkan bahwa akuifer Airtanah berada pada daerah yang dekat sungai yaitu pada titik 4 yang memiliki nilai resistivitas rendah kurang dari 123 Ωm. Kata kunci : Geolistrik tahanan jenis, akuifer Airtanah, software IP2WIN. THE MAPPING OF GROUNDWATER AQUIFERS AT THE RINGROAD MALENDENG VILLAGE BY USING GEOELECTRIC RESISTIVITY METHOD ABSTRACT Geoelectric is a geophysical method that is utilized in natural subsurface exploration. The working principle of geoelectric method is to study the flow of electricity in the earth and how to detect them in the earth's surface. This study aims to map the aquifer Groundwater at the Ringroad Malendeng village based resistivity of the subsurface rocks. The study consisted of four points on 1-sounding track with the distance of each point 40 meters. Exploration results were processed using software IP2WIN to view data subsurface layering based on the value of the resistivity (2D) and point - the point of the presence of Groundwater aquifers. The results showed that the aquifer Groundwater is the area near the river is at point 4 which has a low resistivity value of less than 123 Ωm. Keywords: Geolistrik resistivity, Groundwater aquifers, IP2WIN software.

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GEOPHYSICAL METHODS ADAPTED TO HIGHWAY ENGINEERING PROBLEMS

Geophysics ◽

10.1190/1.1437779 ◽

1952 ◽

Vol 17 (3) ◽

pp. 505-530 ◽

Cited By ~ 8

Author(s):

R. Woodward Moore

Keyword(s):

Seismic Refraction ◽

Geophysical Methods ◽

Engineering Structures ◽

Highway Engineering ◽

Earth Resistivity ◽

The Earth ◽

Ore Bodies ◽

Geophysical Surveys ◽

Engineering Problems ◽

Test Use

Of the several geophysical methods used in exploration for oil and useful ore bodies, the earth‐resistivity and seismic‐refraction tests have been found to be the most adaptable to the shallow tests generally required in highway construction work. Of these, the earth‐resistivity test is the faster and has a wider range of application to highway problems than does the seismic test. Use of both methods of tests in subsurface explorations for engineering structures is expanding. The paper cites a growing need for a more thorough subsurface investigation of all engineering structure sites and gives examples of field data obtained by the Bureau of Public Roads when making preliminary geophysical surveys of proposed highway locations or structure sites. The economic aspects and the advantages and limitations of the two methods of test are discussed with particular reference to their application to highway engineering problems.

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THE USE OF CUMULATIVE RESISTANCE IN EARTH-RESISTIVITY SURVEYS

Canadian Journal of Research ◽

10.1139/cjr45a-007 ◽

1945 ◽

Vol 23a (4) ◽

pp. 57-72 ◽

Cited By ~ 1

Author(s):

R. Ruedy

Keyword(s):

Apparent Resistivity ◽

Middle Layer ◽

The Other ◽

Electrode Spacing ◽

Line Graphs ◽

Earth Resistivity ◽

The Earth ◽

Straight Line ◽

The Individual

When the soil is assumed to consist of two layers—the upper of resistivity ρ1 and the lower of resistivity ρ2—and cumulative resistances are calculated by adding or integrating the earth-resistivity functions for intervals that are a fraction of the thickness of the upper layer, a practically linear relation is obtained between the cumulative resistance and the electrode spacing until the distance between the electrodes is equal to the thickness of the upper material. Should one of the materials be at least twice as conducting as the other, the extent of the deviation from the linear law enables the determination of the depth of the upper stratum and of the ratio between the resistivities of the two layers. When three layers are present and the middle layer is at least twice as thick as the top stratum, the thicknesses may be deduced from the two departures of the cumulative resistances from the linear law. Since these conclusions are based on the theory of the individual apparent resistivity of stratified ground at various electrode spacings, they have the same range of application as the earth-resistivity curves, but the occurrence of straight line graphs facilitates the plotting and the interpretation of results based on a necessarily limited number of measurements.

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