Development of geophysical test sites and its impacts on the research and education activities

Alao, Joseph Omeiza; Lawal, K. M.; Dewu, B. B. M.; Raimi, Jimoh

doi:10.1007/s10064-023-03076-9

Cited by 10 publications

(5 citation statements)

References 54 publications

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“…The investigation of the earth's subsurface to a large extent; can only be done through drilling before the coming of geophysics. The drilling process is time-consuming, highly expensive, tedious, and destructive [1,2,3]. However, geophysics investigation by drilling appears more certain and accurate, but it is highly limited because it can only provide subsurface information at a discrete location, and it is highly restricted to a certain terrain [4,5,6,1].…”

Section: Introductionmentioning

confidence: 99%

“…However, geophysics investigation by drilling appears more certain and accurate, but it is highly limited because it can only provide subsurface information at a discrete location, and it is highly restricted to a certain terrain [4,5,6,1]. Studies have shown that all geophysics explorations and theoretical analysis of acquired data are less effective when compared to physical drilling [2,3]. Therefore, the involvement of geophysics in subsurface exploration such as environmental engineering has become a prominent and promising approach [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

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Modification of the Traditional Half Schlumberger Arrays and its Efficiency for Subsurface Exploration

Abdullahi,

Nagoda,

Jaiyeoba

et al. 2023

Preprint

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Geophysical investigation of the earth’s subsurface is vital for engineering and environmental surveys. Application of the basic methods of geophysics to detect and study subsurface anomalies for engineering and environmental problems. This study modified the existing Half Schlumberger arrays after evaluating the efficiency of the existing Half Schlumberger array. The Modified Half Schlumberger (SMH) relatively produces a better result for a deeper geophysical investigation where there is a limited space than the existing Half Schlumberger (SH). The results of the investigated nine (9) VES stations were presented in tables and graphs, which shows that the two arrays are nearly the same (about 94% in similarity). The SMH array shows an interesting result. It was noted that the S_MH probes were deeper than the usual SF arrays with an average extension of about 2.4 m depth in terms of overburden thickness. In addition, the two arrays produce identical curve types, subsurface parameters, and soil depth section sequences across all the VES stations. The identical results confirmed the efficiency and reliability of the SMH array. Consequently, SMH can be adopted as a practicable alternative array to the traditional SH and the conventional Full Schlumberger (SF) array for any geophysical survey, where the usual SF array is applicable, most especially when deeper subsurface information is required and the available space is highly limited.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modification of the Traditional Half Schlumberger Arrays and its Efficiency for Subsurface Exploration

Abdullahi,

Nagoda,

Jaiyeoba

et al. 2023

Preprint

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“…Recently, several geophysical methods have been employed to identify illegally buried waste, especially in locating underground utilities such as metallic storage tanks [8, 9,10]. These buried targets often exhibit different conductive and non-conductive properties compared to the surrounding soils [1,5,6], which can be detected using VLF-EM. VLF is a non-destructive and non-intrusive geophysical method of surveying the subsurface targets that enables exploration of the earth's subsurface without contact with the ground and is suitable for a wide range area to map regional geology for decades [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…This article aims to examine the responses of a Very Low Frequency Electromagnetic (VLF-EM) on various subsurface targets buried at Ahmadu Bello University Geophysical Test Site (ABUGTS) to simulate scenarios usually encountered in environmental and engineering investigation. A geophysical test site (GTS) also known as a Controlled Geophysical Site (CGS) is a geophysical site where several subsurface targets of known materials, dimensions and geometries have been buried at different orientations and depths to replicate real-life eld investigation scenarios [3,4,5,6]. According to some remarkable studies, GTS is a research platform developed to enhance shallow geophysical investigation, especially for simulating real-life situations in environments and engineering studies [1,5].…”

Section: Introductionmentioning

confidence: 99%

“…A geophysical test site (GTS) also known as a Controlled Geophysical Site (CGS) is a geophysical site where several subsurface targets of known materials, dimensions and geometries have been buried at different orientations and depths to replicate real-life eld investigation scenarios [3,4,5,6]. According to some remarkable studies, GTS is a research platform developed to enhance shallow geophysical investigation, especially for simulating real-life situations in environments and engineering studies [1,5]. Several geophysical methods have been used to identify buried contaminants such as land lls [7].…”

Section: Introductionmentioning

confidence: 99%

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The Effectiveness of Very Low-Frequency Electromagnetics (VLF-EM) Method in Detecting Buried Targets at a Controlled Site

Alao,

Muyideen,

Dewu

et al. 2023

Preprint

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The ever-increasing anthropogenic activities that pose a significant threat to environmental security and sustainability have spurred Geophysicists to enhance geophysical techniques for shallow geophysical investigations, especially in identifying illegal buried materials. This article applied very low-frequency electromagnetic (VLF-EM) at a controlled geophysical site (CGS) where several targets were buried to examine the geophysical response for environmental and engineering simulation. The VLF-EM data obtained on the natural ground (without buried targets) and buried ground along the same profiles demonstrate the nature of the anomalies and the characteristic signals generated by the site's natural ground and after various buried targets are installed. There are clear and significant anomalies source-bodied between the natural and buried ground. The result shows no major high equivalent current density (conductive media) or low equivalent current density (non-conductive media) across the natural ground. Several minors and major conductive and non-conductive zones were encountered after the installations of the buried targets corresponding to conductive and non-conductive buried targets. Some anomalies become stronger over the large conductivity and non-conductive buried targets. A reasonable position of the buried targets was determined by the VLF-EM method with positive matches and few significant mismatches in the actual depths of buried targets. However, there are some unexpected emergencies, where some non-conductive buried target generates high equivalent current density values indicating conductive media, while some conductive buried target produces low equivalent current density values indicating non-conductive body, especially for large spacing. Major and minor characteristic VLF-EM anomalies were obtained across all the survey profiles. The VLF-EM method is more consistent at small spacing and it can be very useful for identifying underground metallic and non-metallic targets.

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The evolving roles of geophysical test sites in engineering, science and technology

Alao¹,

Lawal

Dewu

et al. 2023

Acta Geophys.

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Development of geophysical test sites and its impacts on the research and education activities

Cited by 10 publications

References 54 publications

Modification of the Traditional Half Schlumberger Arrays and its Efficiency for Subsurface Exploration

Modification of the Traditional Half Schlumberger Arrays and its Efficiency for Subsurface Exploration

The Effectiveness of Very Low-Frequency Electromagnetics (VLF-EM) Method in Detecting Buried Targets at a Controlled Site

The evolving roles of geophysical test sites in engineering, science and technology

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