Scholarly works
Permanent URI for this collectionhttps://repository.ui.edu.ng/handle/123456789/420
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Item Groundwater abstraction: a model for saltwater intrusion of coastal fresh water(2017) Adebo, B.; Adetoyinbo, A.The knowledge of salinity level and intrusion of saltwater into freshwater aquifer is necessary for groundwater monitoring and prediction in the coastal areas. In this work, an advection-dispersion saltwater intrusion model is used to study and simulate saltwater intrusion in a typical coastal aquifer. The aquifer portion was divided into grid with elements and nodes. Map of the study area indicating well locations was overlain on the grid system such that these locations coincide with the nodes. Chlorides at these wells were considered as initial nodal salinities. Results showed a highest and lowest increase in simulated chloride of 37.89 mg/L and 0.8 mg/L respectively. It also revealed that the chloride concentration of most of the considered well may climb unacceptable level in the next few years, if the current abstraction rate continues unabatedItem Hydrochemical investigation of groundwater quality in selected locations in Uyo, Akwa-Ibom state of Nigeria(2010) Adetoyinbo, A.; Adebo, B.; Alabi, A.Water is a vital component to the development of an area. Human settlement is to a large extent dependent on the availability of reliable sources of water preferably in close proximity to the settled localities. This paper examines the hydrochemical facies of groundwater present in the Uyo. Akwa Ibom of Nigeria. 40 Borehole water samples were carefully collected in ten different locations in Uyo for various physico - chemical analyses. Calcium, magnesium, iron, zinc, copper, manganese, aluminium, and silver, Nitrate, phosphate, fluoride, chloride, pH, conductivity, total dissolved solid, total suspended solid, hardness, summation of ions as well as the temperature and colour were assessed among the entire samples collected. The results shows that: temperature ranges from 26.3 - 28.3, pH range is 3.19 - 5.18 . This means the borehole water samples fall within the highly acidic range. Conductivity ranges between 10.85 and 181.60 ps/cm. TDS range is 4.7 - 86.8mg/l, TSS is between 1.0 and 12.0 mg/1, Total hardness (2.61 - 31.29 mg/1) and Chloride concentration (5.0 - 9.36mg/l). Results show that some of the water samples considered in this work do compare favourably with WHO (1984) water standard for drinking and domestic usages while some other samples of boreholes water fall short of this standard.Item Quality of hand-dug wells in selected locations in Lagos coastal aquifer, Nigeria(2010) Adetoyinbo, A.; Adebo, B.Thirty water samples were collected from hand dug wells in Six different locations in the study areas. These include: Ikeja, Lagos Island, Ajah, Victoria Island, Eti- Osa and Yaba. The chloride concentrations of all the samples were acquired and then compared with the World Health Organisation (WHO) standards for chloride content in drinking water. We selected hand dug well because it is a common source of drinking water in the area under consideration. Results show that the average chloride concentrations in all the samples collected in all the six locations are above the WHO value of 250mg/l (value recommended for safe drinking water) with Ajah having the highest Chloride concentration of 606.68mg/l and Ikeja with the least value of 255.37mg/l. This indicates that the water in the considered areas is not safe for drinking. Chloride concentration in the Lagos coastal aquifer may become equal to that at the source at some infinitestimal time and this portends a great danger to the use of groundwater for domestic purposes.