ABSTRACT: Morphometry is a technique for locating groundwater resources by analyzing landforms and drainage systems. The drainage pattern is crucial for determining the basin's hydrology using morphometric data. In addition, the morphometric parameters of the basin determine the type of streaming system used to get water to the streams. The River Ogun-Osun Basin (ROSB) covers an area of 22800 km2, and according to Strahler's classification method of the digital elevation model (DEM), the drainage network retrieved from the basin shows a dendritic drainage pattern. Therefore, the research region is classified as a fourth-order basin, with lower order streams dominating the basin. In association with the land use land cover characteristics, the land use transformation could modify the morphometric properties of the basin. For example, the relative change shows that rock outcrop and forest decreased by 135.9% and 97.7%, respectively, from 2000 to 2019 using the Landsat ETM+ and OLI datasets. The dynamics of this change shows that most rock outcrops have been converted to bare soil due to quarry activities. Similarly, most forests have been converted to croplands. This is capable of modifying the streamflow and the overall discharge in the basin. Decision-makers can use the findings of this study to plan and manage the basin more sustainably.
Keywords: DEM, GIS, Basin, Morphometric analysis, Landuse/landcover
JoST. 2021. 11(2): 145-164
Accepted for Publication: November 29, 2021
