- Ghana
VICTOR OFORI AGYEMANG
University Of Ghana, Accra,Legon, Department of Earth Science, Graduate Student
Research Interests:
Research Interests:
Research Interests:
Research Interests: Geology and Geophysics
Hydrogeophysical assessment of aquifers in the Upper Denkyira East and West Districts of Ghana has been carried out for groundwater potential and protective capacity of the overburden rocks determination. The data for the study were... more
Hydrogeophysical assessment of aquifers in the Upper Denkyira East and West Districts of Ghana has been carried out for groundwater potential and protective capacity of the overburden rocks determination. The data for the study were obtained from the Regional office of Community Water and Sanitation Agency (CWSA), Cape Coast. A total of thirty-seven VES probed using a Schlumberger array with maximum current electrode spacing (AB/2) of 100 m at each point using the Abeam Terameter was used. The data were interpreted using the partial curve matching and WINRESIST computer iteration program techniques. The thickness and resistivities of the various overburden layers, basement resistivity, reflection coefficient and longitudinal conductance were used for the assessment of the groundwater potential and the protective capability of the overburden layers. The study revealed three-to-six layers with an average of four (4) layers including laterite (0.34–3.57 m); clay (0.64–8.84 m); sandy-cl...
Research Interests:
Research Interests:
Geostatistical techniques have been applied to successfully assess the groundwater quality in the Afigya Kwabre District of Ghana. Forty boreholes were sampled for physicochemical and bacteriological characteristics of the groundwater.... more
Geostatistical techniques have been applied to successfully assess the groundwater quality in the Afigya Kwabre District of Ghana. Forty boreholes were sampled for physicochemical and bacteriological characteristics of the groundwater. Principal component analysis revealed that seven components contain 81.01% of the variation of the original variables. Factor 1 accounted for 31.34% of the total variance, factor 2 accounted for 10.97%, third and fourth factors explained 8.41% and 8.19%, the fifth factor showed 8.13% while the sixth and seventh components showed 7.76% and 6.21% variances, respectively. R-mode cluster analysis showed five clusters. Cluster 1 was made of Na+, Cl−, TH, SiO2, HCO3− and TDS. Cluster 2 and cluster 3 contained dissolved oxygen (DO), pH, K+ and F−, Br, respectively. Cluster 4 was made of PO43− and NO3−and Cluster 5 had Ca2+, Mg2+, Total. coli, Fecal. coli, SO42−, and salinity. Correlation analysis revealed a strong positive correlation between EC and TDS, Mg2...
Research Interests:
The Magnetotelluric (MT) geophysical method has successfully been applied in groundwater exploration within the Birimian rocks of Mankessim. The technique has provided information on the rocks and structural relationships within the... more
The Magnetotelluric (MT) geophysical method has successfully been applied in groundwater exploration within the Birimian rocks of Mankessim. The technique has provided information on the rocks and structural relationships within the investigative depth of up to 300 m for hydrogeological purposes. The method provides information on the aquiferous zone and the general depth of burial. The study revealed that the resistivity of the subsurface materials within the study area ranges from 0.1 Ωm to 4.0 Ωm. The study shows that the groundwater occurrence in the area is mainly controlled by fractured and weathered zones. It is highly possible to encounter groundwater at the saprock zone. This zone is fractured and weathered zones sandwiched by the overburden and the bedrock. The static water level of the study area is about 25 m. This shallow depth makes the groundwater resource prone to contamination through anthropogenic activities such as the application of agrochemicals and the use of p...
Research Interests:
One hundred and twenty (120) groundwater samples were taken from forty (40) boreholes from Afigya Kwabre District of Ghana to study the Hydrochemical characteristics to know the current state of the groundwater quality, the natural... more
One hundred and twenty (120) groundwater samples were taken from forty (40) boreholes from Afigya Kwabre District of Ghana to study the Hydrochemical characteristics to know the current state of the groundwater quality, the natural processes and anthropogenic activities that affects the groundwater quality as well as the suitability of the groundwater for drinking, domestic and agricultural purposes. The objective was to contribute to and improve the understanding of the hydrochemistry of the groundwater in aquifers in the study area and also to understand the suitability of the groundwater for drinking, domestic and irrigation purposes. Although a lot of works on the groundwater hydrochemistry and quality assessment have been done in Ashanti region of Ghana very little detail work has been conducted with regard to the quality of the groundwater delivered by the aquifers within the Districts on smaller scale. Methods used in this work include groundwater sampling, laboratory analysi...
Research Interests:
Hydrogeophysical assessment of aquifers in the Upper Denkyira East and West Districts of Ghana has been carried out for groundwater potential and protective capacity of the overburden rocks determination. The data for the study were... more
Hydrogeophysical assessment of aquifers in the Upper Denkyira East and West Districts of Ghana has been carried out for groundwater potential and protective capacity of the overburden rocks determination. The data for the study were obtained from the Regional office of Community Water and Sanitation Agency (CWSA), Cape Coast. A total of thirty-seven VES probed using a Schlumberger array with maximum current electrode spacing (AB/2) of 100 m at each point using the Abeam Terameter was used. The data were interpreted using the partial curve matching and WINRESIST computer iteration program techniques. The thickness and resistivities of the various overburden layers, basement resistivity, reflection coefficient and longitudinal conductance were used for the assessment of the groundwater potential and the protective capability of the overburden layers. The study revealed three-to-six layers with an average of four (4) layers including laterite (0.34–3.57 m); clay (0.64–8.84 m); sandy-cl...
Forty (40) boreholes in the study area were sampled to study the heavy metals contamination in groundwater. The purpose of this study was to understand the impact of heavy metals on groundwater quality in the study area. Sampling of... more
Forty (40) boreholes in the study area were sampled to study the heavy metals contamination in groundwater. The purpose of this study was to understand the impact of heavy metals on groundwater quality in the study area. Sampling of groundwater, samples analysis in the laboratory, Heavy metal pollution index, pollution evaluation index and statistical techniques were methods applied in the study. The study revealed that Fe > Mn > Pb = Cu > Cd is the order in which the concentrations of the heavy metals in the groundwater decreases. Lead and and iron show high mean concentration values as compare to the WHO (2012) recommended values. Assessment of human health risk by hazard quotient (HQ) and Hazard index revealed no alarm for non-carcinogenic adverse risk except three communities namely Nkukua Buoho (HQ = 2.5194, HI = 2.2251), Denase (HQ = 1.3856, HI = 2.5583) and Nkwantakesse 2 (HQ = 3.1994, HI = 3.2203). Again, in some of the samples, the cancer risk values were greater than 1.0 × 10−6, which shows the possibility of cancer risk occurrence after a longer period of using the groundwater for drinking without prior treatment. The study identified both geogenic and anthropogenic activities as the sources of heavy metal concentration in the groundwater. The correlation analysis showed that there are no strong correlations among the heavy metal pairs, suggesting different sources, independence and different behaviors during transport. The Cd, HPI, and HEI concentrations show that 10%, 17.5%, and 7.5% respectively as highly polluted due to the public sewage which is the main possible source in the study area.
Research Interests:
The groundwater quality in the Agona East District has been evaluated for drinking and irrigation uses. Fourteen boreholes from the district were sampled and analyzed to study the groundwater hydro chemical characterization. The objective... more
The groundwater quality in the Agona East District has been evaluated for drinking and irrigation uses. Fourteen boreholes from the district were sampled and analyzed to study the groundwater hydro chemical characterization. The objective was to characterized groundwater chemistry on a small scale to understand the processes that influence the hydro chemistry of the groundwater, the possible source of contaminates and the groundwater suitability for drinking and agricultural purposes. Previous studies have reported on the hydro chemical characterization of groundwater on a large scale. However, the detail work with regard to groundwater characterization as well as the quality of the groundwater in the locality is lacking. The study involves taken of groundwater samples, analysis of the samples in the laboratory and analysis of the data generated. The order of the cation in the water samples is Na+> Ca2+> Mg2+ > K+ while that of the anions is HCO3-> SO42-> Cl-> NO3-. The study revealed that the major groundwater types in the study area are CaMgCHO3, mixed water and NaCl in decreasing order. The study identified carbonates weathering, silicate weathering, ion exchange together with improper waste disposal as factors influencing the hydrochemistry of the area. The high correlation between groundwater parameters indicates that similar processes influence the concentrations of the parameters. The groundwater is considered suitable for drinking and domestic purposes because almost all the parameters such as Na+, K+, HCO3-, Cl-are within the permissible limits prescribed by WHO (2012), and calculation of WQI shows that it is good for drinking purpose. However, low pH is the health-based concern observed in the groundwater use for drinking and domestic purposes. The groundwater is generally good for irrigation; however, the high sodium percent (%Na > 60%), high Kelly Index (KI > 1) and High Magnesium Ratio (MR > 50%) in some samples are the concern observed for the groundwater use for irrigation.