Morphometric Analysis of Gubi Dam Basin for Flood Vulnerability Using Shuttle Radar Topographic Mission (STRM)

Abstract

This paper examines the relationship between the different morphometric parameters and characters of the drainage terrain. To do that, Gubi dam basin in Bauchi state, Nigeria drainage characteristics was delineated using Shuttle Radar Topographic Mission (SRTM) data. The Aspect, Drainage, and Slope maps were prepared using ArcGIS 10.2.1 software. The Gubi Dam is fifth-order stream that exhibits dendritic to sub-dendritic pattern. The trails drainage patterns are also observed in some areas of the basin, which may be due to the effect of regional tectonics. The mean bifurcation ratio is 1.47 showing normal basin which is somehow controlled by structural disturbances. Drainage density (0.25) shows very coarse drainage texture also having positive correlation with stream frequency. The elongation ratio is 0.08 along with circulatory ratio (0.21) shows elongated nature of the basin. The low values of drainage density and stream frequency imply that surface run-off is not quickly removed from the basin, making it susceptible to flooding and gully have very little effect on the extent to which the surface has been lowered by agents of denudation. Keywords : Morphometric, Flood, Shuttle, Radar, Topographic, Mission DOI: 10.7176/JEES/10-3-08 Publication date: March 31 st 2020