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A framework combining geophysical and hydrogeological data for protecting groundwater sources in Nigeria

Doro, Kennedy O. and Obakhume, K. A. A. and Adelakun, C. O. and Aizebeokhai, A. P. and Oladunjoye, M.A (2019) A framework combining geophysical and hydrogeological data for protecting groundwater sources in Nigeria. In: American Geophysical Union, Fall Meeting 2019, December 2019.

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Groundwater is preferred to surface water as a drinking water source because it is less vulnerable to contamination from pathogens and chemical compounds. However, there is an increasing threat to groundwater health globally and in Nigeria resulting from sources such as uncontrolled use of fertilizers, chemicals and saltwater intrusion along coastal aquifers. To avoid high remediation costs and the health hazards associated with contaminated groundwater, it is preferable to protect groundwater sources. Groundwater source protection approaches include imaging aquifer structure, mapping source catchment area, estimating travel time distribution and parameters controlling groundwater flow and solute transport as well as investigating the mechanisms controlling saltwater intrusion. These studies require the use of numerical models parameterized by field parameter estimates. Field estimates of aquifer parameters at high resolution remains a challenge globally and in Nigeria, the quantification of spatially varying hydraulic parameters necessary to reduce uncertainties in groundwater source protection and assess vulnerability has received minimal attention. This research therefore takes a first step in exploring the use of predictive numerical models and field parameter estimates integrating geophysical and hydrogeological methods for protecting groundwater sources from anthropogenic contamination and seawater intrusion. We utilized refraction seismic and electrical resistivity for delineating the aquifer architecture while resistivity provided a proxy for imaging saltwater intrusion and transient groundwater flow. The multi-geophysical data sets aided high resolution estimates of hydrodynamic and hydrodispersive parameters used for calibrating the groundwater flow and solute transport models using MODFLOW, MT3DMS and SEAWAT. In addition to extending the global state of the art on characterizing aquifer heterogeneity at high resolution, this research produces a framework that can aid policy formulation for protecting groundwater resources in Nigeria.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: 0920 Gravity methods;  EXPLORATION GEOPHYSICS;  0925 Magnetic and electrical methods;  EXPLORATION GEOPHYSICS;  0935 Seismic methods;  EXPLORATION GEOPHYSICS;  0999 General or miscellaneous;  EXPLORATION GEOPHYSICS
Subjects: Q Science > QC Physics
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 27 Nov 2020 12:34
Last Modified: 27 Nov 2020 12:34

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