At the Physics department office
Appointment on Visitation important
Topic: Environmental Geophysics
Application of Electrical Impedance Tomography (EIT) in the investigation of subsurface, with emphasis on underground contaminants in landfill sites. It is a technique that allows estimation of the spatial distribution of the electrical conductivity within an object from voltage measurements at its boundary, using non-invasive imaging technique. The internal conductivity distribution of the object is reconstructed based on electrical measurements from electrodes attached around the boundary of the object or body under investigation.
Research interest is also in the application of electrical resistivity tomography to study runoffs from highways or roads which can be a significant non-point source of pollutants. These arise from the release of a range of toxic contaminants such as heavy metals, polycyclic aromatic hydrocarbons (PAH) from vehicles, road wear and road maintenance activities. Heavy metals are produced from vehicular corrosion, tire treads, brake linings, and pavement abrasion. The incessant incidence of pavement failure of road structure is becoming alarming and has become a common phenomenon in many parts of Nigeria. These failures have been attributed to a number of factors such as inadequate information about the soil and the incompetence of these subsurface geologic materials. This research will therefore try to use electrical resistivity imaging surveying method to study the causes of consistent failure of some roads in Lagos, Southwest, Nigeria. It will involve a longitudinal probe of the failed, fairly stable, and stable portions of the roads as well as perpendicular probe using a two dimensional (2D) imaging profile.
My research interest is also open to other areas in Geophysics.
|Department of Physics, Federal University of Agriculture, Abeokuta
Geophysical Assessment of Vertical Leachate Migration and Aquifer Protective Capacity of Cassidy Dumpsite, Ojo, Lagos State, Nigeria
The disposal of wastes generated by human activities within a municipality is generally an urban problem. Municipal solid waste disposal is a global concern, most especially in developing countries across the world; as poverty, population growth and high urbanization rates combine with ineffectual and underfunding by governments to prevent efficient management
The aim is to assessing the vertical extent of leachate migration and aquifer protective capacity of Cassidy Dumpsite, Ojo, Lagos State, Nigeria
i. To identify the presence of any possible contaminants at the study area
ii. To ascertain the depths and thicknesses of aquifer units.
iii. Determine the aquifer protective capacity.
Materials and Methods
The delineation of subsurface structures was carried out using vertical electrical sounding (VES) and two-dimensional (2D) resistivity imaging. A total of 25 VES and four 2D resistivity profiles were acquired in the study area using Schlumberger and Wenner configurations respectively. Leachate contamination was tested using longitudinal unit conductance (S) parameter, derived from the apparent resistivity and thickness values. Analysis of VES and 2D resistivity data was done using WinResist and DIPROFWIN Software respectively.
i. Establishment of leachate contaminant plume in the study area
ii. Determination of different resistivity, depth and thickness of layers in the study area
iii. Determination of different aquifer protective capacity of the study area
Contribution to knowledge
i. The protective capacity should not be ignored at planning stages of groundwater exploration. The zones indicating good/moderate aquifer protective capacity which depict low vulnerability should be optimally utilized
ii. Integrated approach in characterizing surbsurface using 1D and 2D electrical resistivity methods for the purpose of assessing vertical leachate migration and aquifer protective capacity has been established
OGUNGBE ABIOLA is a Professor at the Department of Physics
OGUNGBE has a Ph.D in Geophysics from Department of Physics, Federal University of Agriculture, Abeokuta