M.O. Lasisi, A. F. Ogunnaike, O. G. Akinwamide
Remote sensing (RS) and Geographical information system (GIS) have become effective and efficient tools in identification of drainage pattern of the study area. GIS and RS techniques can be used for the identification of morphological features and analyzing properties of basin. The topographic map of Oluyole catchment area was scanned and geo-referenced before it was exported into ArcGIS 10.0 software. The digitized map is edited, and saved as line coverage in ArcGIS Software. This paper aimed at analysing the morphometric parameters of Oluyole drainage basins located on basement steep rock in South Western Nigeria. Geographical Information System (GIS) and Remote Sensing (RS) techniques were used for morphometric analyzes of drainage basins of Oluyole catchment area. Google Earth and LANDSAT 7 sensor of 2016 ETM+, path 191 and row 55 of VHS were used to acquire the satellite imageries of Oluyole catchment area. Using high resolution imageries, a Digital Elevation Model (DEM) was developed with Surfer 8 and ArcGIS 10.0. The drainage, elevation, land use, slope, flow direction, flow length and flow accumulation maps of the study area were generated by using the Digital Elevation Model. Result obtained indicated that studied basins exhibits high, medium and low spatial variations in their morphometric properties. The study further revealed that morphometric properties of Oluyole drainage basin induced high, medium and low magnitude flood. The results revealed that the used of remotely sensed data and ArcGIS 10.0 software provide an effective approach to develop accurate morphometric analysis of drainage basin with a minimum amount of time, effort, and cost. This approach creates easily read and accessible charts and maps that facilitate the identification of drainage pattern of the study area. The GIS based Morphometric analysis of this drainage basin revealed that the Oluyole catchment is homogeneity in texture. This study would help the local people to utilize the resources for sustainable development of the basin area.
Morphometric Analysis, Drainage Basin, Gis And Rs.