Abstract
One of the major factors affecting the sustainability of agricultural production is flood and erosion. Increased population pressure is one of the leading factors causing flood and erosion resulting in forest/wood land clearance for wood and smallholding agriculture; traditional agricultural practices; and declining land productivity which result in less vegetation growth and expose more land surface area to erosions. Available information on floods and erosion and knowledge of the areas that are likely to be affected during flooding and erosion helps to mitigate the risk of flooding and erosion. This chapter adopts GIS as a tool to identify and map flood and erosion risk areas in Osun state. Three category risk zones: high, medium, and low risk zones were identified from the erosion and flood risk map generated. The flood risk map shows that high risk zones covered land area of 1210 sq km, medium risk zones covered land area of 5290.2 sq km, and low risk zones covered land area of 7970 sq km. The erosion risk map shows that the high risk zones for erosion covered land area of 820 sq km, medium risk zones covered land area of 5660 sq km, and low risk zones covered land area of 8310 sq km. Finally, recommendations on strategies for militating against flood and erosion risks were discussed and if implemented it will help the Nigerian government authorities to improve on flood and erosion management in the affected state.
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Abbreviations
- DEM:
-
Digital Elevation Model
- ENVI:
-
Exelis Visual Information Solutions
- ESRI:
-
Environmental Systems Research Institute
- ETM+:
-
Enhanced Thematic Mapper Plus
- FAO:
-
Food and Agricultural Organization
- FGN:
-
Federal Government of Nigeria
- FME:
-
Federal Ministry of Environment
- GIS:
-
Geographic Information Systems
- GLCF:
-
Global Land Cover Facility
- NDVI:
-
Normalized Difference Vegetative Index
- RS:
-
Remote Sensing
- SRTM:
-
Shuttle Radar Topography Mission
- TM:
-
Thematic Mapper
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Ojo, O.I., Awujoola, O.O., Ilunga, M.F. (2021). Flood and Erosion Risk Assessment Mapping. In: Leal Filho, W., Luetz, J., Ayal, D. (eds) Handbook of Climate Change Management. Springer, Cham. https://doi.org/10.1007/978-3-030-22759-3_174-1
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DOI: https://doi.org/10.1007/978-3-030-22759-3_174-1
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