GEOSPATIAL ANALYSIS OF THE IMPACT OF OYAN RIVER DAM IN OGUN STATE NIGERIA ON ITS DOWNSTREAM COMMUNITIES
DOI:
https://doi.org/10.48346/IMIST.PRSM/ajlp-gs.v8i4.52145Keywords:
Geospatial analysis, Water quality, Downstream communities, Socio-economic impacts, Environmental impacts, Satellite imagery, Blueness analysisAbstract
Context and background
The Oyan River Dam, located in Ogun State, Nigeria, is a major water infrastructure that provides water for irrigation, domestic, and industrial purposes. Over time, the dam has impacted the downstream communities environmentally and socio-economically, potentially leading to land use and water quality changes. These impacts call for a comprehensive study to assess the environmental and socio-economic effects of the dam and to propose measures to mitigate its negative consequences.
Goal and Objectives:
The study aims to assess the environmental and socio-economic impacts of the dam and provide information to mitigate its negative effects. It focuses on analyzing land use changes, water quality, and the dam's impact on downstream communities.
Methodology:
- LULC Analysis: Satellite data from 2000, 2010, and 2020 were analyzed using ArcGIS to track changes in built-up areas, water bodies, and vegetation.
- Water Quality: Water clarity was assessed using NDWI and NDTI indices.
- Survey: Questionnaires were distributed to 500 residents to evaluate the dam's environmental and socio-economic impacts.
Results:
- LULC: Built-up areas expanded, vegetation cover declined, and water bodies slightly increased.
- Water Quality: Water clarity deteriorated over time, with increased turbidity.
- Impacts: Environmental issues like biodiversity loss (50%) and water pollution (76%) were reported, along with socio-economic impacts such as agricultural reliance and health problems like waterborne diseases (40%).
References
Abimbola, A. F., & Aina, O. M. (2019). Analysis of the Socioeconomic Impacts of Oyan Dam on the Livelihood of Farmers in Ogun State, Nigeria. Journal of Environmental Science and Public Health, 3(2), 8-17. https://doi.org/10.11648/j.env.s.2019030201
Adeogun, A. A., & Atubi, A. O. (2020). Geospatial Assessment of Water Hyacinth Proliferation and Its Impact on Water Quality in Oyan Reservoir, Ogun State, Nigeria. Journal of Environmental Science and Public Health, 4(1), 15-25.
Eltawil, A. B., Boes, R. M., & Alharbi, T. F. (2019). Remote sensing and GIS-based approach for assessing dam impacts on agriculture. Journal of Water Resources Planning and Management, 145(9), 04019049. https://doi.org/10.1061/(ASCE)WR.1943-5452.0001084
Mijinyawa, Y., Aliyu, M., & Tukur, M. (2018). Challenges of Water Management in Nigeria. Journal of Environmental Science, Toxicology and Food Technology, 12(8), 17-21.
Olajide, O. M., Adeniyi, O. D., & Agunbiade, O. O. (2017). Assessment of the impacts of dams on river systems in Nigeria. Sustainable Water Resources Management, 3(1), 51-60. https://doi.org/10.1007/s40899-016-0082-1
Ogunsanwo, O. Y. (2020). Assessment of the water quality of Ogun River system: Implications for sustainable water resource management in Ogun State, Nigeria. Journal of Environmental and Public Health, 2020, 1-12. https://doi.org/10.1155/2020/8857769
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