ADEMENO WEMIMO OLASUNKANMI
MGEOSON, CCNA, CCAI (U.K),
Email: [email protected]
A Geo-model is defined as “a geological, geotechnical, topological and topographical information system containing all available factual geological and geotechnical information. It is accessible on computers and makes locating a piece of information relatively easy in comparison with tracking down a report filed in a library” (Mogens Porsvig and Frank Mller Christensen, 1994).
It is “designed as an application surrounding the Intergraph CAD package (AutoCAD and MicroStation) and the database (information) system”. The primary concept of the Geo-model is based on the idea of utilizing all available information during all phases of a project with regard to geology, geotechnics, topography and structures with the data at all stages, meeting the demands of quality control and quality assurance. To pursue this aim, the information has to be stored in well-structured, comprehensive databases with user-friendly entrances. The Geo-model can be installed on two platforms for security and administrative reasons. These are: A central computer and various workstations. The central computer will contain all validated data and must support transfer of data to sub-models on workstations.
The University of Lagos was chosen as a case study having observed that groundwater development projects were carried out over years within the campus community.
The analysis of the Geo-Model shows that geological formations, geophysical prospecting and geotechnical activities could well be presented in both 2-D and 3-D formats. This lay to rest the issue of three dimensional modelling; the geological information gives a clear, detailed better presentation and documentation for easy manipulation and round-table discussion or desk-study than conventional method, can be useful in deciding areas to be further surveyed by the Geophysicists, where the water service station could be sited and what should be the material composition of the water pipes; the geophysical interpreted layers and the contour maps of the surveyed areas are useful in delineating possible zone of promising water-bearing aquifers; information on the population of the study area, annual temperature and rainfall as possible sources of aquifer recharge, water quality analysis were represented using charts; borehole location, water-pipe, waterworks, reservoir etc. could be derived by querying, distances of well sites to waterworks and to leechates/dumping sites were determined using different methods in the Geo-Model and so on.
Software such as ESRI ArcView version 3.1, ArcScene version 8.1, AutoCAD 2000 and 2002, Surfer 7.0, MS-Excel, MS-PowerPoint, Imaging and MS-Word were employed. Ilwis 3.0 was used for the production of Mosaic map. All works incorporated into ArcView 3.1. Visual C++ version 6.0, various mathematical and logical techniques were used in the programming of other models included in the research work.