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Landuse, landcover change dynamics and flooding in the lower Niger basin Onitsha, South Eastern Nigeria

Author

Listed:
  • Nkiruka, Ezebube M.
  • Chinedu, Ani D.
  • Smart, Uchegbu N.

Abstract

This study looked at the factors contributing to Onitsha's incessant flooding, specifically landuse and land cover depletion. The landuse/landcover changes during a period of ten years (2008 – 2018) and the relevant variables were studied in the lower Niger Basin, focusing on Onitsha, Anambra State. Three sets of Enhanced Thematic Mapper Plus (ETM+) Landsat imagery maps from 2008, 2013, and 2018 were used to construct three Geographic Information Systems (GIS) based landuse/landcover maps of the research location and cross-tabulation method was adopted for the Change Detection analysis. The results demonstrated that between 2008 and 2013, built-up areas expanded by 9.4%, and between 2013 and 2018, they increased by 9.4%. Then it grew by 5.5%, resulting in a total area of 470 ha and 275 ha. Then, between 2008 and 2018, built-up added 745 ha in the study region, whereas vegetation lost 638 ha between 2008 and 2013, and another 97 ha between 2013 and 2018, for a total loss of 735 ha. Between 2008 and 2013, the area of bare ground increased by 1.3%, to 65 ha, while between 2013 and 2018, the area of bare ground decreased by 0.3%, to 15 ha. This study also discovered a 40-hectare rise in waterbody between 2008 and 2013 and a 100-hectare loss between 2013 and 2018. Based on the findings, the changes in landuse/landcover change detection provided insight into non-compliance with existing landuse acts and the implementation strategies of government agencies enforcing them.

Suggested Citation

  • Nkiruka, Ezebube M. & Chinedu, Ani D. & Smart, Uchegbu N., 2023. "Landuse, landcover change dynamics and flooding in the lower Niger basin Onitsha, South Eastern Nigeria," Land Use Policy, Elsevier, vol. 131(C).
    • Handle: RePEc:eee:lauspo:v:131:y:2023:i:c:s0264837723002144
    DOI: 10.1016/j.landusepol.2023.106748
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