Assessing the effects of 1D assumption violation in vertical electrical sounding (VES) data processing and interpretation

Abstract. The absence of outcrops in the field will make it difficult to interpret geoelectric data. To be able to determine the lithological limit below the surface, a geoelectric resistivity method with a Schlumberger (Vertical Electrical Sounding) configuration with different iteration and Root Mean Square (RMS) is used. Measurements were made with 4 geoelectric points and at the first point 2 intersections were intersected with each stretch length of 50 meters. Data processing is done manually and continued using the PROGRESS software to interpret the data and adjust the iteration and Root Mean Square (RMS). Based on the results of the interpretation of the intersection between stretch 1 and stretch 2 depict the inside of the Top Soil and the iteration obtained will be a reference to interpret the next geoelectric data. Keywords: geoelectrical method, schlumberger configuration, iteration, RMS Abstrak. Tidak terdapatnya singkapan dilapangan akan membuat kesulitan dalam menginterpretasi data geolistrik. Untuk dapat mengetahui batas litologi dibawah permukaan digunakan metode geolistrik tahanan jenis dengan konfigurasi schlumberger (Vertical Electrical Sounding) dengan perbedaan iterasi dan Root Mean Square (RMS). Pengukuran dilakukan dengan 4 titik geolistrik dan pada titik pertama dilakukan 2 bentangan secara berpotongan dengan masing – masing panjang bentangannya 50 meter. Pengolahan data dilakukan secara manual dan dilanjutkan menggunakan perangkat lunak PROGRESS untuk menginterpretasi data dan menyesuaikan iterasi dan Root Mean Square (RMS). Berdasarkan hasil interpretasi perpotongan antara bentangan 1 dan bentangan 2 menggambarkan kedalam dari Top Soil dan iterasi yang didapatkan akan menjadi acuan untuk menginterpretasi data geolistrik selanjutnya. Kata Kunci : metode geolistrik, konfigurasi schlumberger, Iterasi, RMS

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Pendugaan Potensi Volume Akuifer Menggunakan Metode Geolistrik di Pulau Gili Ketapang, Probolinggo, Jawa Timur

EKSPLORIUM ◽

10.17146/eksplorium.2019.40.1.5415 ◽

2019 ◽

Vol 40 (1) ◽

pp. 53

Author(s):

Dino Gunawan Pryambodo ◽

Joko Prihantono

Keyword(s):

Population Density ◽

Data Processing ◽

Vertical Electrical Sounding ◽

Population Increase ◽

Small Island ◽

Water Addition ◽

Groundwater Aquifer ◽

Sandy Limestone ◽

Electrical Sounding ◽

Geoelectric Data

ABSTRAKPengukuran geolistrik dengan menggunakan konfigurasi schlumberger telah dilakukan di Pulau Gili Ketapang, sebuah pulau kecil yang memiliki kepadatan penduduk mencapai 12.356 jiwa/km2. Pengukuran dilakukan di 8 lokasi menggunakan metode pada 8 titik Vertical Electrical Sounding (VES). Hasil pengolahan data geolistrik menunjukkan nilai tahanan jenis akuifer berkisar antara 2,71–206 Ωm pada litologi batugamping pasiran. Potensi volume akuifer terbesar berdasarkan model 2D akuifer air tanah berada di lokasi K-03 dan K-17. Model 3D akuifer air tanah menunjukkan bahwa volume akuifer sebesar 27.689.400 m3 atau sekitar 27.689.400.000 liter. Air tanah di dalam akuifer dapat bertahan selama 68 tahun jika tidak terjadi kenaikan populasi. Selain itu, air tanah juga akan bertahan meskipun tidak terjadi penambahan air di dalam akuifer, baik secara alami ataupun buatan.ABSTRACTGeoelectric measurement using Schlumberger configuration was carried out in Gili Ketapang Island, a small island with a population density of 12,356 people/km2. The measurement conducted at 8 locations using a vertical electrical sounding (VES) method. The result of geoelectric data processing shows aquifer resistivity value ranging from 2.71–206 Ωm at the sandy limestone lithology. The largest aquifer volume potency based on the 2D groundwater aquifer model is in the K-03 and K-17 location. The 3D groundwater aquifer model shows that the aquifer volume is 27,689,400 m3 or about 27.689.400.000 liters. The groundwater inside the aquifer will last within 68 years in a condition where there is no population increase. Besides, the groundwater also lasts even there is no water addition inside the aquifer, by natural or artificial

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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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