Geophysical mapping of groundwater aquifers beneath the Central Region of Ghana

Year 2021, Volume: 16 Issue: 3, 113 - 122, 30.09.2021

Hafiz Mohammed Nazıfı Salamatu Bannib Lambon

Abstract

Geophysical data were used to map groundwater aquifers beneath two towns in Central Region of Ghana. The geophysical data include electromagnetic, electrical resistivity profiling and vertical electrical sounding. The results revealed that, the surveyed areas are underlain by three to four layers. The resistivity values of the first layer ranges between 71.93 to 2399.70 Ωm and the average value of 617.46 Ωm. The layer thickness ranges between 0.48 – 7.42 m with an average value of 1.73 m. The second layer has the resistivity values between 41.96 to 1996.12 Ωm with an average value of 678.19 Ωm. The thickness of the second layer is 1.77 – 20.87 m with an average thickness of 9.26 m. The third layer which in some towns served as the bed rock has resistivity values between 298.91 to 861250.57 Ωm and an average value of 87473.04 Ωm. The layer thickness ranges between 6.00 to 18.39 m with an average value of 13.89 m. The fourth layer has the resistivity values between 915.78 to 2066.15 Ωm with an average value of 1647.44 Ωm. The depth to aquifer within the study area is between 0.48 to 7.42 m. The average aquifer thickness within the study area is 14.78 m. The results of this study were used to determine the drilling locations for groundwater in the region.

Keywords

Groundwater Aquifers, Central Region (Ghana), Electromagnetic data, Electrical Resistivity Data, Geophysical Mapping

References

• Binley, A. (2003). ProfileR. Lancaster, England: Lancaster Environment Centre, Lancaster University.
• Ehinola, O. A., Opoola, A. O., & Adesokan, H. A. (2006). Empirical analysis of electromagnetic profiles for groundwater prospecting in rural areas of Ibadan, southwestern Nigeria. Hydrogeology Journal, 14(4), 613–624. https://doi.org/10.1007/s10040-005-0468-z
• Ewusi, A., & Kuma, J. S. (2011). Calibration of Shallow Borehole Drilling Sites Using the Electrical Resistivity Imaging Technique in the Granitoids of Central Region, Ghana. Natural Resources Research, 20(1), 57–63.
• Gyamera, E. A., & Kuma, J. S. (2014). Hydrogeological studies on soils developed over granitic deposits. 2, 29–40.
• Kesse, G. O. (1985). The mineral and rock resources of Ghana. Rotterdam, Netherlands: A. A. Balkema.
• Mohammed Nazifi, H. & Gülen, L. (2019). The use of electromagnetic and vertical electrical sounding methods in groundwater exploration, Bulletin of the Mineral Research and Exploration, 158, 327–344. https://doi.org/10.19111/bulletinofmre.451557
• Pirttijärvi, M. (2014). AEMINV, Laterally constrained 1-D inversion of EM profile data. Oulu, Finland.