A Combined GIS, Remote Sensing And Geophysical Methods For Groundwater Potential Assessment Of Ilora, Oyo Central, Nigeria

Abstract

This research combined GIS, Remote sensing and geophysical methods for groundwater potential investigation. The study aimed at delineating groundwater potential zones within Ilora, Oyo central, Nigeria. Unavailability of water is a major menace in these area and agricultural activities are suffering as a result. Landsat 8 OLI, ASTER DEM, geological, geophysical, and soil data of the research area were acquired for this study. In order to map groundwater potential of the area, eight thematic layers that influence groundwater occurrences and movement controlling factors such as, geology, elevation, slope, land use land cover (LULC), fault proximity, soil, lineament density, and drainage density were mapped out from the acquired data of the area. The influence of each theme and sub unit/class to groundwater recharge based on previous studies was evaluated using Analytical Hierarchical Process (AHP). The groundwater potential of the area of study was qualitatively classified into five classes, namely; very high, high, moderate, low, and very low which account for 0.3%, 7.8%, 54.8%, 35.6%, and 1.5% of the total area respectively. The results were cross-validated using well data from the area and 89% correlation was achieved. The groundwater potential map generated in this research could be used as a preliminary reference in selecting suitable sites for groundwater resource exploitation in the area in order to ameliorate the current scarcity of water in this region.

Investigation of Groundwater Potential Using Remote Sensing and Hydro-geophysical Techniques: A Case Study of the Telidjene Basin (Eastern Algeria)

“…Because remote sensing data are relevant to the hydro-morphometric characteristics of the aquifer, it is necessary to incorporate other data sources such as geophysics, especially the electrical method. The use of geophysical methods provides valuable information to identity the nature as well as the geometry of the valuable information and to monitor the hydrogeological process (Zitouni et al, 2017;Moreira et al, 2021;Breusse, 1963) This integrated methodology, combining remote sensing and geophysics, has been used by several authors and studies worldwide (Gyeltshen et al,2020;Mohamaden et al, 2017;Ogungbade et al, 2021;Nicaise et al,2019;MogajiandOmobude, 2017); moreover, the new technology based on remote sensing is considered as an effective, fast and less costly tool that provides data on factors controlling the presence and water movement.…”