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Community-based assessment of coastal erosion in Lagos, Nigeria

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Abstract

Coastal erosion is a natural process that constantly reconfigures beaches, either in a landward or seaward direction. This study aims to assess the situation, causes, and impacts of coastal erosion on selected communities in Lagos State, Nigeria. Three local government areas (LGAs) that share boundaries with the coast (Ibeju-Lekki, Eti-Osa and Badagry-West LGAs) were purposively sampled. Google Earth Pro images were acquired from Landsat, Copernicus, Maxar technologies, and TerraMetrics for 1984, 1999 and 2021 to analyze shoreline movement dynamics using Digital Shoreline Analysis Software. A structured questionnaire was used to elicit information on the communities' perceptions. We used the convenience sampling method to administer 670 samples of the questionnaire at a 95.52% response rate. Images analysis revealed that Eti-Osa has the highest erosion distance (98.54 m) at an erosion rate of 8.88 m/year, while Badagry-West LGA has the least erosion distance (25.82 m) at an erosion rate of −2.31 m/year. This confirms the respondents’ perception of coastline erosion and accretion which varies significantly across communities at X2 (18) = 378.54, p < 0.05. The perceived leading causes of coastal erosion include heavy rainfall, intense storms, sea-level rise, developmental activities, and the anger of the gods, and they vary significantly across the communities at communities (X2 (36) = 135.46, p < 0.05). The malevolent effects of this phenomenon, which include loss of homes and properties, groundwater quality impairment, relocation of settlement, and a threat to tourism, also vary significantly across communities. These communities are characterized by a low level of resilience to coastal erosion, hence susceptible to impending effects of climate change.

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Authors and Affiliations

  1. Department of Geography, University of Ibadan, Ibadan, Nigeria

    Olutoyin Adeola Fashae & Cindy Chekwubechukwu Emeh

  2. Department of Geography and Planning Science, Adekunle Ajasin University, Akungba-Akoko, Ondo State, Nigeria

    Rotimi Oluseyi Obateru

  3. Department of Geography, University of the Free State Qwaqwa Campus, Phuthaditjhaba, South Africa

    Efosa Gbenga Adagbasa

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  1. Olutoyin Adeola Fashae
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Fashae, O.A., Obateru, R.O., Adagbasa, E.G. et al. Community-based assessment of coastal erosion in Lagos, Nigeria. Nat Hazards 114, 3657–3682 (2022). https://doi.org/10.1007/s11069-022-05536-z

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