ANALYSIS OF SMALL HYDROPOWER POTENTIAL OF OSUN RIVER USING GEOGRAPHIC INFORMATION SYSTEM AND REMOTE SENSING IN SOUTHWESTERN NIGERIA

Dauda O. Olatunji, Daniel O. Johnson, Kabiru A. Hassan, Godwin A. Ali

Abstract


This paper uses remote sensing and geographic information system (GIS) techniques to estimate hydrological parameters for measuring the small hydropower potential of river Osun. The technique is necessary because of the challenges posed by ungauged streams and the need for reliable data to manage water resources effectively. Hydrologic Engineering Center -River Analysis System (HECRAS) and Hydrologic Engineering Center - Hydrologic Modeling System (HECHMS) software tools were used for modelling the river and the X-Y geometry of the river shows the bank points at each cross-section from which the river width was derived. At the same time, data was generated showing the slope, river width, river depth and velocities across the channel at various river cross-sections at 200m. Model validation and ground truth data reveal little variations in the simulated and observed data. The result indicates the stream flow rate, water surface profiles and water availability along the river channel within three years. The simulated flow rate is 59.43 - 90.15m3/s, with the mean being 75.76m3/s while the river’s flow behaviour shows that Kaplan turbine is best suitable for the hydropower potential on the river.. Conclusively, the paper demonstrates the capability of remote sensing and GIS techniques in improving the accuracy of hydrological models and enabling data availability for sustainable management of water resources for hydroelectric power system.    

 

KEYWORDS:  GIS techniques, HECRAS, HECHMS, river depth, water resources 


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