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Hydrological Mapping

4507.2 - Modeling Groundwater Flow System of a Drainage Basin in the Basement Complex Environment of Southwestern Nigeria

Tuesday, July 4
1:50 PM - 2:10 PM
Location: Maryland B

This study attempted to model the groundwater flow system of a drainage basin within the Basement Complex environment of Southwestern Nigeria. Four groundwater models were derived from Vertical Electrical Sounding (VES) Data, remotely sensed data, geological information (hydrolineaments and lithology) and borehole data. Subsequently, two sub-surface (local and regional) flow systems were delineated in the study area. While the local flow system is controlled by surface topography, the regional flow system is controlled by the networks of intermediate and deep seated faults/fractures. The local flow system is characterized by convergence, divergence, inflow and outflow in places, while the regional flow system is dominated by NNE-SSW and W-E flow directions. Minor flow directions include NNW-SSE and E-W with possible linkages to the main flow-paths. The NNE-SSW regional flow system is a double open ended flow system with possible linkage to the Niger Trough. The W-E regional flow system is a single open ended system that originates within the study area (with possible linkage to the NNE-SSW regional flow system) and extends to Ikogosi in the adjoining drainage basin. Thus, the groundwater drainage basin of the study area is much larger and extensive than its surface drainage basin. The all year round flowing (perennial) rivers are linked to groundwater outcrops from faults/fractures and contact zones. Consequently, larger percentage of annual rainwater usually leaves the basin in form of runoff and base flow. Therefore, the basin is categorized as a donor basin but with suspected subsurface water input at its northeastern axis.

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Akinola Shola Akinwumiju

Lecturer
Federal University of Technology, Akure, Ondo State, Nigeria

Dr Akinwumiju Akinola Shola graduated from Geography Department of University of Ilorin (Nigeria) in 2003. He has M.Sc. in Geography of University of Ibadan (Nigeria; 2007), M. Sc. in Remote Sensing and GIS of OAU (Nigeria; 2011). He obtained his Ph.D in Ecology and Environmental Science (Remote Sensing and GIS Option) of OAU, Nigeria. He has vast experience in Application of Remote Sensing and GIS in Geo-sciences. He has keen interest in Spatial Modeling, Programming and Application of RS and GIS in Geo-sciences with special focus of 3D sub-surface Modeling. Dr Akinwumiju currently lectures in the Department of Remote Sensing and Geoscience Information System, School of Earth and Mineral Sciences, Federal University of Technology, Akure, Nigeria.

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Martins Olusola. Olorunfemi

Lecturer
Obafemi Awolowo University, Ile-Ife, Osun State, Niger

Professor Olorunfemi graduated with First Class from Department of Geology of Obafemi Awolowo University (Nigeria) in 1974. He obtained his Master and Ph.D degrees in Geological Sciences (Geophysics Option) from University of Birmingham, United Kingdom between 1976 and 1979. He has more than 40 years teaching and Research Experience in the field of Geosciences

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Paulo Raposo

Assistant Professor of Geography
The University of Tennessee, Knoxville

Dr. Raposo is a cartographer, and an Assistant Professor in Geographic Information Science in the Department of Geography at The University of Tennessee, Knoxville. He received his PhD in Geography, with a specialization in cartography, from Penn State University. His interests are in cartographic design, multiple representation and generalization, geometry, and raster surfaces.

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