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Articles by A.O. Ayeni
Total Records ( 5 ) for A.O. Ayeni
  A.O. Ayeni and I.I. Balogun
  Heavy metals have high significance among the inorganic contaminants of surface water (e.g., ponds and streams) due to their non-degradable nature in heighten injurious biological effect. For this reason, therefore, this study examined the influence of the land-uses on the performance of the selected heavy metals using z-score and coefficient of variation. In order to achieve the aim of this study, thirty surface ponds water were sampled across four land uses in Akoko Northeast LGA of Ondo State, Nigeria. The sampled water were assessed for four heavy metals and evaluated using the Z-score and coefficient of variation. The heavy metals are zinc (Zn), iron (Fe), manganese (Mn) and copper (Cu) while the land uses comprise of built-up areas, cultivated lands, vegetation and crop plantation. Observed heavy metals results were converted to standardized Z-scores (z) to facilitate objective comparisons and enablement of performance among each parameter in the ponds across the land uses. The predefined water quality result variations were objectively subjected to coefficient of variation (CV) to confirm the level of parameters comparability. Thus, the z-score results of heavy metals identified strong remarkable spatial dependency when p>0.01 or weak remarkable spatial dependency when p<0.01 while performance denote homogeneous when CV<50% or heterogeneous when CV>50%. In conclusion, the study exhibited spatial variation in concentrations of the four heavy metals as a result of different land uses characteristic.
  O.O. Fasunwon , A.O. Ayeni and A.O. Lawal
  Analytical study of boreholes water quality in both sedimentary terrain and basement complex were carried out with 16 samples from different boreholes, collected from two different States (regions) representing the lithology in South Western Nigeria. It is in no doubt that the composition of a terrain has influence on the water quality and from both terrains, it was observed that the pH ranges from 5.30 to 7.60, Iron, Nitrite, Nitrate and Manganese contents have maximum values of 2.70, 2.00, 7.30 and 0.10 mg L-1, respectively. Total alkalinity ranges from 12.00-155.0 mg L-1, total hardness ranges from 21.00-275.00 mg L-1, salinity ranges from 15.00-566.00 mg L-1, chloride ranges from 5.50-70.00 mg L-1, but sulphate is absent in all the water samples. The obtained results showed how elemental compositions vary with lithology and how water qualities in the two zones are almost suitable for use/consumption of the populace. Although, some samples from the Sedimentary basin have slight high Iron content, this calls for attention.
  A.O. Ayeni , A.S.O. Soneye , O.O. Fasunwon , R.T. Miteku and L.A. Djiotang-Tchotchou
  Understanding the basin-scale hydrologic potentials in managing water resources require the optimization of relevant model. Therefore, this study described the efficiency of CHyM4 model in optimizing water resource planning in a climate change scenario using daily rainfall and discharge data in Benin/Owena river basin, Nigeria. The model produced daily series rainfall and discharge data at a resolution of 1 km across small catchments. Rainfall and discharge scenarios such as average monthly flow discharge, flow direction, drained surface and accumulated time series (onset, peak and offset of rain) were generated from the observed and simulated for the basin between January and December, 2004. The model simulated results were compared with the basin observed data result. Observations show a wide variation in the monthly simulation in the area with precipitation decreasing slowly Northward over the period. Observed rainfall depths/discharge trends and CHyM4 simulation have similar results as shown from the comparison between the simulated and observed rainfall and discharge output. The observed result was used to examine the optimal efficiency of the basin for water resources planning and management based on the projected result. This is essential in order to sustainably manage available water resources within the basin.
  A.O. Ayeni , I.I. Balogun and A.S.O. Soneye
  This study assessed the seasonal surface water quality of River Ala upstream Akure-Nigeria. This was necessitated by the peoples' consideration of water from rivers as substitute to the reigning incidence of water shortage in the downstream of the river. Six locations were chosen spatially within the urban built-up to reflect a consideration of all possible human activities that are capable of changing the quality of river water. Water samples were collected for a period of 12 months. The water samples collected were analyzed for physico-chemical parameters which include pH, total dissolved solids, dissolved oxygen, biochemical oxygen demand, total hardness, calcium, magnesium, chlorine, nitrate, iron and zinc using standard procedures. For spatial reference the location of sampling points were determined with GPS and interpolated on digitized topographical map sheets of the study area. The observed results of the laboratory analysis were then presented, described and compared descriptively with the international standards for drinking water. It was observed that variation exists in the quality of the sampled waters and impaired to different degrees using WHO drinking water standards for the selected parameters. The results of the correlation coefficient shows that inverse or direct relationship exist between some parameters for instance, there is inverse relationship between pH and DO at 95% confidence level during the rainy season while Ca+ has direct relationship with Mg and Cl¯ 95%. Therefore, considering the level of impairments of Ala River in Akure-Nigeria, water is unsafe for domestic purposes and it continuous use prognosticate health danger to the residents.
  A.O. Ayeni
  Nigeria is located primarily within the lowland humid tropics and generally characterized by a high temperature throughout the year. Record shows that malaria accounted for over 45% of all out-patients and about 50% of the Nigerians suffer from at least one episode of malaria each year. Over the years, the increase in population, rainfall fluctuation and urban heat cum high thermal discomfort that has been experiencing recently and the problem of unhygienic environment are noted to have contributed to the increase in malaria morbidity in Akure. This study based on an evaluation of the existing framework on malaria incidence using meteorology data between 1986 and 2008 and hospital records between 2000 and 2008 as well as relevant field studies. Malaria cases increased from 24,092 (of which male and female accounted for 12,477 and 11,615 respectively) in year 2000 to 62,121 (of which male and female accounted for 30,413 and 31,708, respectively) in year 2008. It was noted over the area that, the rainfall trend has reduced by -0.008 cm annually (the highest and lowest rainfall was received in 1997 and 2003 respectively within the 23 years studied). Temperature shows little deviation but on the average decreases by -0.002°C (the year 1994 and 1995 experienced highest temperature while 2007 recorded the lowest). Also, malaria morbidity index shows an increase of 0.005 annually between 2000 and 2008. The study also discusses various future climate change scenario associated risks in Akure if the issue is not well addressed at appropriate time.
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