Use of remote sensing and GIS techniques for groundwater exploration in the basement complex terrain of Ado-Ekiti, SW Nigeria

Abstract

Integrated investigations involving remote sensing and GIS have been conducted with the objective of achieving optimal results in sustainable groundwater development in Ado-Ekiti, southwestern Nigeria. The hard rock terrain in the region presents challenges in groundwater exploration. Landsat imageries were used for landuse/landcover mapping and lineament analysis for groundwater prospecting. Shuttle Radar Topographic Mission Digital Elevation Model was used for drainage network extraction, slope and geomorphological analysis. Thematic maps were generated, analysed in terms of hydrogeological importance and reclassified for integration using appropriate software. The groundwater potential maps generated were validated against the existing groundwater yield data. The light vegetation and bare soil area cover was 110.9 km 2 , with the rock outcrops covering a total area of 14.9 km 2. Hydrogeomorphic units delineated included hills, pediments, pediplains, alluvium and valley fills. The lineaments showed predominantly NNW-SSE, ENE-WSW and NNE-SSW orientations and subsidiary NW-SE and WE trends. Application of geospatial techniques has been recognized. The methodology provides improvements in the understanding of the hydrogeological characteristics of the basement terrain. These will aid planning and management of groundwater resources in the crystalline basement terrain.

Watershed land use, surface water vulnerability and public health risks of two urban rivers, Ado-Ekiti, South-West Nigeria

“…By implication, Ureje and Awedele urban rivers will have a high propensity for nonpoint source pollution problems and could derive more benefit from wider riparian buffers than higher-order rivers. Reports on the Ado-Ekiti basement complex terrain depict a high occurrence of medium-to small-sized rivers [74], an indication that surface water vulnerability may be a regional-scale problem.…”

Petrographic and Mechanical Analyses of Selected Granitic Rock Deposits in Ado-Ekiti, South-West Nigeria.

“…The predominant rocks forming the basement complex are categories as the migmatite-gneiss complex, the schist belts and the Pan-African granites (Afolagboye, Talabi and Akinola, 2016). The rock formations in this location are reported to be granite rocks, charnockitic rocks, quartzite series, gneisses and migmatites (Oyedele, 2019). Outcrop of quartzites occurrence in Ado Ekiti can rise to 100 m above the surrounding ground level.…”

Delineation of Landfill Sites for Municipal Solid Waste Management using GIS

“…Light showers of less than 10 mm/hr account for only 25%. The major rivers and streams draining the area include Alamoji, Elemi, Ireje; Omisanjana and Awedele Streams [20,23,24].…”

“…Landfill site selection is acknowledged as a complicated process as it entails consideration of a large number of variables [1,5]. It is a tasking enterprise particularly in the basement complex terrain which is known to be hydrogeologically challenging with hydraulic properties characterized by extreme variations over short distances [19][20][21]. Environmental protection and public health considerations are the primary concerns in landfill site selection [3,11,22].…”

“…With the implementation of GIS, a large volume of geospatial data and information are maintained in a standard format, revised, and updated with additional features. Sustainable development and management are thus facilitated at real time [3,11,20]. This paper presents an integration of remotely sensed data, soil type, geological, and geoelectrical data carried out in a GIS environment with a view to developing a suitability map for the location of landfill sites in Ado Ekiti, Southwestern Nigeria.…”