Weighted Linear Combination Procedures with GIS and Remote Sensing in Flood Vulnerability Analysis of Abeokuta Metropolis in Nigeria

Oyedepo J. A.1,*, Adegboyega J.2, Oluyege D. E.1, and Babajide, E. I.1

1Institute of Food Security, Environmental Resources and Agricultural Research, Federal University of Agriculture, Abeokuta, Nigeria
2Department of Environmental Management and Toxicology, College of Environmental Resources Management, Federal University of Agriculture, Abeokuta, Nigeria

*Corresponding Author: oyedepoja@fuaab.edu.ng

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 Vol. 5 No. 1  | March 2021 | Pages 240 – 257

https://doi.org/10.36263/nijest.2021.01.0260   |   Cite this article

Abstract

ABSTRACT

The study offered the opportunity for an evaluation of the role of Remote Sensing and Geospatial techniques in flood disaster risk management and development of spatial decision support system for flood risk assessment and management in Abeokuta metropolis. Datasets used includes cloud free high resolution satellite images and Shuttle Radar Topographic Mission (SRTM) data downloaded from earth explorer site. Soil data used was obtained from Food and Agriculture Organization (FAO’s) Harmonised World Soil Database, while rainfall data was obtained from the Climate Hazards Group InfraRed Precipitation Station. Maps of flood enhancing factors namely: soil types, rainfall intensity, drainage density and topography were created in Geographic Information Systems using same scale of 1: 50,000 and Geographic coordinate system (WGS 1984). All maps were produced in raster format with the same cell grid cell size of 0.0028 mm. They were then subjected to weighting by ranking and Multi-Criteria Analysis (MCA) using the Weighted Linear Combination. The study identified topography and land use as key factors contributing to flooding within Abeokuta metropolis. Obstruction of natural drainage channels by buildings aggravates disasters from flash flood events.

Keywords: Flash flooding, Flood Vulnerability, GIS-Remote sensing model, Weighted Linear combination, Multi-Criteria Evaluation, Abeokuta Metropolis

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Oyedepo J. A., Adegboyega J., Oluyege D. E. and Babajide, E. I. 2021. Weighted linear combination procedures with GIS and remote sensing in Flood Vulnerability analysis of Abeokuta metropolis in Nigeria. Nigerian Journal of Environmental Sciences and Technology, 5(1), pp. 240-257. https://doi.org/10.36263/nijest.2021.01.0260


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