Abstract
The increasing frequency of flooding incidents in Isheri North of Ogun State is a growing concern. The overflow of the Ogun River as a result of increased volume of rainfall persistently led to flooding in communities resulting in loss of lives and properties. The study assessed the environmental and socio-economic impacts of flooding in the area. Monthly rainfall data records for 30 years (1990-2019) were obtained from Nigerian Meteorological Agency (NiMET), lkeja and analyzed using basic descriptive statistical technique. Landsat images for 2000, 2015 and 2020 with 30m resolution were obtained and analyzed to determine the implications of the flooding on the inhabitants of the areas. Land uses were identified and classified from the satellite imageries help in evaluating the impacts of the floods. The data were subjected to digital image processing and supervised classification was carried out on the images of the various dates. Results obtained shows flooding has strong connection with rapid population growth and infrastructure expansion along the floodplain, inadequate setback from the river valley and unregulated urban land use. On the basis of the results, the paper suggest approaches to the challenge including: land-use planning and flood control policies including a firm control on infrastructure development. Keywords: Flooding, Geographical information system, Land cover, Landsat Imageries DOI: 10.7176/JEES/11-11-02 Publication date: November 30 th 2021
Highlights
Flooding is debatably a weather-related hazard that is most pervasive globally (Oje and Ugbonna 2010: Toka 2017)
According to t (Oyinloye et al 2013) that flood is an extreme weather event naturally caused by rising global temperature which results in a heavy downpour, thermal expansion, of the ocean and glacier melt, which in turn results in rising in sea level thereby causing saltwater to inundated coastal lands
Flooding has caused about one-third of all death and hundreds of thousands have been rendered homeless and properties worth millions of Naira destroyed as a result of the devastating flood across the country (Oyinloye et al 2013)
Summary
Flooding is debatably a weather-related hazard that is most pervasive globally (Oje and Ugbonna 2010: Toka 2017). There no analysis of the historic flood hazards in Isheri North of Lagos State This calls for periodic study that will aid in analyses of flood event in the Study area. A review of studies in the southwestern part of Nigeria suggests an increase in the application of remote sensing in environmental monitoring, especially for data collection and analysis, as the technology develops in the country (Oyinloye and Kufoniyi 2013; Eludoyin et al, 2019; Eludoyin and Iyanda, 2019). Many of these studies reveal a transition from the use of aerial photographs and topographical maps to satellite remote sensing data, such as SPOT and Landsat imageries as they become available for exploration by researchers in the country.
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