Adeniyi Ganiyu Adeogun

Coupled 1D-2D hydrodynamic inundation model for sewer overflow: Influence of modeling parameters

Abstract This paper presents outcome of our investigation on the influence of modeling parameters on 1D-2D hydrodynamic inundation model for sewer overflow, developed through coupling of an existing 1D sewer network model (SWMM) and 2D inundation model (BREZO). The 1D-2D hydrodynamic model was developed for the purpose of examining flood incidence due to surcharged water on overland surface. The investigation was carried out by performing sensitivity analysis on the developed model. For the sensitivity analysis, modeling parameters, such as mesh resolution Digital Elevation Model (DEM) resolution and roughness were considered. The outcome of the study shows the model is sensitive to changes in these parameters. The performance of the model is significantly influenced, by the Mannings friction value, the DEM resolution and the area of the triangular mesh. Also, changes in the aforementioned modeling parameters influence the Flood characteristics, such as the inundation extent, the flow depth and the velocity across the model domain.

Resource assessment and feasibility study for the generation of hydrokinetic power in the tailwaters of selected hydropower stations in Nigeria

Abstract This paper focuses on assessing the potential and feasibility of increasing the hydropower production of Nigeria’s three main hydropower stations by installing hydrokinetic turbines behind the existing dams. The hydrokinetic turbines will capture additional power from the energy remaining in water currents exiting draft-tube outlets and tailraces of the dams. A 2.54 m2 prototype hydrokinetic turbine system being developed by the National Centre for Hydropower Research and Development, Nigeria was used to theoretically estimate the increased power generation capability of the stations. Preliminary results showed that there are considerable potentials in the range of kilowatts and megawatts in each hydropower station to augment the existing power infrastructure and this can be harnessed to alleviate the existing power problems in the country. It may also be an additional way of generating clean energy to mitigate the effect of climate change.

Morphometrical Analysis and Peak Runoff Estimation for the Sub-Lower Niger River Basin, Nigeria

Abstract This study utilized Spatial Information Technology (SIT) such as Remote Sensing (RS), a Geographical Information System (GIS), the Global Positioning System (GPS) and a high-resolution Digital Elevation Model (DEM) for a morphometrical analysis of five sub-basins within the Lower Niger River Basin, Nigeria. Morpho-metrical parameters, such as the total relief, relative relief, relief ratio, ruggedness number, texture ratio, elongation ratio, circularity ratio, form factor ratio, drainage density, stream frequency, sinuosity factor and bifurcation ratio, have been computed and analyzed. The study revealed that the contribution of the morphometric parameters to flooding suggest catchment No. 1 has the least concentration time and the highest runoff depth. Catchment No. 4 has the highest circularity ratio (0.35) as the most hazardous site where floods could reach a great volume over a small area.