Browsing by Author "Adetoyinbo, A."

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Detection of decay and hollows in living almond trees (terminalia catappa L. roxb.) using electrical resistivity method
(Springer, 2018-10) Soge, A.; Popoola, O.; Adetoyinbo, A.
A precise and cost-efficient diagnostic technique for detecting decay and other structural defects in living trees is indispensable for the risk assessment and conservation of urban and forest trees. A study was carried out to detect the location and extent of decay and hollows (or cavities) in almond trees (Terminalia catappa L. Roxb.) using the four-point electrical resistivity method. Electrical resistivity measurements (ERm) of randomly selected living almond trees were taken using an earth resistivity meter, four probes and a modified form of Schlumberger electrode configuration. The ERm were used to obtain resistivity profiles (RP) of the trees. The RP of freshly cut healthy, decayed and hollowed trees were also obtained. A laboratory experiment was set up to replicate the RP of healthy, decayed and hollowed trees. Wood decay and cavities in trees were detected through RP matching. In comparison to healthy trees, wood decay and cavities in tree stems were detected with relatively sharp decrease and increase in electrical resistivity values, respectively. The extent of the resistivity anomalies corresponds to the extent of wood decay and cavities in trees. This method is applicable to early detection of decay and cavities in hardwood trees.
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 unabated
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.
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.