Abstract
Hydrochemical investigation of groundwater was carried out on the coastal aquifers of Ogun Waterside, Southwestern Nigeria. Groundwater samples were collected and assayed for physicochemical parameters during wet season (August, 2016) and dry season (March, 2017). The analysed data were further subjected to correlation analysis (CA), principal component analysis (PCA), hydrochemical facies and descriptive statistics. Results revealed that the groundwater is slightly acidic with fresh to saline character. The CA showed very strong associations between TDS, EC and Cl concentrations in both wet and dry seasons. PCA confirmed the main factor influencing the groundwater chemistry in the study area to be component I (salinity component). Piper plots also revealed that the aquifer is mainly of Na-Cl water type. Schoeller and Stiff diagrams showed that the groundwater comprises relative abundance of major ions in the following order: Na^+>K^+>Mg^(2+)>Ca^(2+) for the cations and Cl^->HCO_3^->SO_4^(2-)for the anions. Thus, the primary process influencing the hydrochemistry of the study area is saltwater invasion while mineral dissolution and rainwater infiltration play less significant roles. Most parameters fall within the permissible limit proposed by the World Health Organization (2011) and Nigerian Standard for Drinking Water Quality (2007). However, higher concentrations of chloride and bicarbonate ions observed towards the southern flank of the study area suggest signs of impairment. Assessment of the sampled water for agricultural purposes with respect to salinity hazard, Total Hardness (TH), percentage sodium (%Na) and Sodium Adsorption Ratio (SAR) revealed that the water is suitable for agricultural activities.
Biography
Dr. Ganiyu Badmus is a lecturer in the Department of Mathematical and Physical Sciences at Afe Babalola University with a specialization in Solid Earth Physics. His research interests include Groundwater Geophysics, Environmental Geophysics and Earthquake Seismology. More specifically, his current research looks at Delineation of suitable zones for artificial recharge of groundwater using integrated GIS-based AHP and CSI techniques in Southwestern Nigeria.
After receiving his Bachelor of Science degree in Physics Science at Lagos State University in 2007, Badmus obtained his Master of Science degree in Physics at the University of Ibadan in 2011 and bagged his Doctoral Degree in Environmental Geophysics at the Centre of Excellence in Agricultural Development and Sustainable Environment (CEADESE), Federal University of Agriculture, Abeokuta, Nigeria in 2019. His doctoral dissertation examines “Assessment of seasonal variation of saltwater intrusion using integrated geophysical, hydrochemical and GIS/remote sensing methods in Ogun Waterside, Ogun State, Nigeria”. He has 17 research articles published in peer reviewed local and international journals.
Dr. Badmus is a member of professional bodies such as the Nigerian Institute of Physics (NIP), Society of Exploration Geophysics (SEG) and African Geophysical Society.
Contact Information:
Phone No: +234 7033509958
Email: ogbadmus@abuad.edu.ng

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