Geophysical appraisal of groundwater potential in the crystalline rock of Kishi area, Southwestern Nigeria

Oladunjoye, Michael A.; Adefehinti, A.; Ganiyu, K. A. O.

doi:10.1016/j.jafrearsci.2018.11.017

Cited by 18 publications

(3 citation statements)

References 12 publications

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“…The aquifer layer had a range of resistivity values that vary from 682 to 1347 Ωm, where the aquifer was found in the fissure and fracture of schist and sandstone rocks as revealed by Sukrisna (2004). High aquifer values are common in aged rocks such as schist and sandstone [21,39]. Apart from being a limited aquifer, schist can also act as an aquifuge layer, that is, a layer that cannot hold or drain water [28,40].…”

Section: Resultsmentioning

confidence: 99%

Aquifer Vulnerability: Its Protection and Management—A Case Study in Pangkalpinang City, Indonesia

Nugraha

Gaol

Hartanto

et al. 2020

International Journal of Geophysics

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Increased anthropogenic activity in urban areas has exacerbated the vulnerability of groundwater resources. The AVI, GOD, SINTACS, and DRASTIC methods were used to analyze groundwater vulnerability in Pangkalpinang City. Schlumberger vertical electrical sounding was used to determine the lithology and aquifer configuration in the study area. There are three vulnerability index areas in the city of Pangkalpinang. Low levels of aquifer vulnerability were generally found in the southeastern and northwestern parts of the study area, whereas high levels of aquifer vulnerability were discovered in the northern and southern parts of the study area. Areas with low aquifer vulnerability levels generally have low hydraulic conductivity values on the protective layer. In these areas, groundwater extraction is possible with a reasonable extraction pattern. Industrial areas can also be built by considering environmental aspects. In an area with high-level aquifer vulnerability, groundwater pollution must be considerably managed. The areas should not be designated for industrial areas and excess groundwater extraction.

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Section: Resultsmentioning

confidence: 99%

Aquifer Vulnerability: Its Protection and Management—A Case Study in Pangkalpinang City, Indonesia

Nugraha

Gaol

Hartanto

et al. 2020

International Journal of Geophysics

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“…Such a complexity naturally associates a rapid decrease in groundwater yield and storage with depth [11] [12]. Many studies have investigated fractured basement aquifers to appraise groundwater structure and functionality [13] [14] [15] [16], understand groundwater recharge [17] [18], evaluate the hydrogeochemical evolution of groundwater [19] [20], and place production water wells [21]. Regional scale hydraulic properties are preferably interpreted using numerical simulation of long-term groundwater fluxes and records of hydraulic heads distributed throughout the aquifer [22] [23].…”

Section: Introductionmentioning

confidence: 99%

Subsurface Characterization for Groundwater Management nearby the Unfinished Obelisk Archeological Site, Aswan Governorate, Egypt

Abdulaziz¹

2019

OJG

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Recently, the area located within the Unfinished Obelisk (UO) archeological site showed numerous seepages and accumulations of groundwater in a small pond located a few meters from the Unfinished Obelisk. The Supreme Council of Antiques sponsored integrated geological, geophysical, and hydrogeological studies to identify the possible sources of groundwater and the optimum technique to manage the groundwater flow system that may jeopardize this invaluable sculpture. The geological units and the prevailing structure have been studied in detail using Landsat imagery and field work over two consecutive seasons. The field studies indicated the development of several fault/joint systems oriented mainly ENE-WSW with clear indications of mineralization and intensive weathering effects along these fabrics. Several resistivity (vertical seismic profile and resistivity imaging) measurements extending down to at least 20 m depth and Radar imaging down to 10 m depth are gathered to investigate the extension of outcrop units and the dominant structures prevailing the near subsurface. Geophysical data indicated the development of at least three hydrostratigraphic units arranged from top to bottom as valley fill, fractured/weathered granite, and slightly fractured to massive granitic unit. In addition, the major faults mapped by resistivity images helped to locate several observation wells and a production well to test the transmissivity across the groundwater system. The results of a pumping test indicated very low aquifer conductivity and the development of an aquitard with preferential vertical flow at the study area. This enforces a local interference through a shallow underground drainage system with sump and pump to maintain low groundwater level at the UO-archeological site.

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“…The applications of geoelectric have been widely used in various fields of science. Some of the examples for the application of geoelectric on civil engineering field are to find out the soil and rock stratigraphy [8], groundwater position [9], position of the aquifer [10], soil and rock permeability and porosity [11], location of the bedrock [10], and to determine dimension and depth of foundation and other buried structures [12].…”

Section: Introductionmentioning

confidence: 99%

Application of Digital Image Technology for Determining Geometry, Stratigraphy, and Position of Cracks Inside Earth Slope

Amalia¹

2019

GEOMATE

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In the concept of cracked soils, one of the important factors for determining slope stability is the position of cracks. The position of cracks has been successfully obtained by other study using geoelectric testing. The geoelectric data produces several colors that describe the conditions of the slope geometry, soil stratigraphy, and the position of the cracks inside the slope. In order to improve the accuracy of reading geoelectric data for slope stability analysis, a digital image processing technique is proposed here. This digital image technology is applied by means of an auxiliary program based on the graphical user interface (GUI) that exists inside the MATLAB m-files and utilizing the option of RGB (Red, Green, Blue) color formats. With this technique, geoelectric data retrieval will take place automatically, thus it can be directly used as input for the slope stability analysis program to determine the value of the slope safety factor. The image processing technique in this study is based on using a straight-line equation to detect slope geometry, soil stratigraphy, and the position of cracks on slopes based on the geoelectric data. The simulation results in this study provide sufficiently accurate values of geoelectric data retrieval, which is to reach 5.78 cm/pixel. The larger the pixel size of the processed slope image, the higher the accuracy of the program outcomes. The results of this study will be later used for input in the new slope stability analysis based on cracked soil approaches utilizing digital image technology.

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Geophysical appraisal of groundwater potential in the crystalline rock of Kishi area, Southwestern Nigeria

Cited by 18 publications

References 12 publications

Aquifer Vulnerability: Its Protection and Management—A Case Study in Pangkalpinang City, Indonesia

Aquifer Vulnerability: Its Protection and Management—A Case Study in Pangkalpinang City, Indonesia

Subsurface Characterization for Groundwater Management nearby the Unfinished Obelisk Archeological Site, Aswan Governorate, Egypt

Application of Digital Image Technology for Determining Geometry, Stratigraphy, and Position of Cracks Inside Earth Slope

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