American Journal of Geophysics, Geochemistry and Geosystems
Articles Information
American Journal of Geophysics, Geochemistry and Geosystems, Vol.5, No.4, Dec. 2019, Pub. Date: Feb. 14, 2020
Geospatial Mapping of Flood Risk in the Coastal Megacity of Nigeria
Pages: 129-138 Views: 303 Downloads: 72
Authors
[01] Kolade Victor Otokiti, Department of Urban and Regional Planning, Federal University of Technology, Akure, Nigeria.
[02] Opemipo Akinola, Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Ile-Ife, Nigeria.
[03] Kayode Nelson Adeniji, Department of Urban and Regional Planning, Osun State University, Osogbo, Nigeria.
Abstract
Flood risk in coastal megacities of developing nations is higher than those in developed nations due to inadequate fiscal resources, urbanization, and poor flood maintenance infrastructure, amongst other factors. Lagos is one of the coastal megacities of the developing nations characterized by increasing urbanization and population growth. This study presents geospatial mapping of flood risk areas in the coastal megacity of Nigeria. The flood prone areas were derived by overlaying seven flood factors in ArcGIS environment, which include: elevation, curvature, slope, flow accumulation, normalized difference water index (NDWI), land cover and drainage density. Results showed that of the 2507.2 km2 land area covered by this study area, 0.006% (0.15km2) falls in very high risk, 30.9% (774.7 km2) falls in high risk, 68.8% (1725km2) falls in moderate risk and only 0.31% (7.8km2) falls in low risk areas. Furthermore, highly urbanized Local Governments in relatively low elevations with low slope angles such as Eti-Osa, Apapa, Lagos Island, Lagos Mainland and Ojo have high risk of getting flooded while most Local Governments with low level of urbanization and high elevations have moderate to low risk of getting flooded. These findings have implications on sustainable decision making and planning for flood risk prevention and management, prioritizing flood risk control mechanisms where necessary, and the development and implementation of potent flood control policies with appropriate infrastructure in areas that fall in both very high risk and high risk.
Keywords
Coastal Megacity, Flood Risk, Geospatial, Nigeria, Ikeja, Lagos State
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