Obiefuna, Jerry and Omojola, A. and Adeaga, O. and Uduma-Olugu, Nnezi (2017) Groins or Not: Some environmental challenges to urban development on a Lagos coastal barrier island of Lekki Peninsula. Journal of Construction Business and Management, 1 (1). pp. 14-28.
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8.Groins_or_Not Some environmental challenges 2017.pdf Download (1MB) |
Abstract
Worldwide, barrier islands are usually sedimentary, dynamic and in high demand for urban development. Intense development negates their dynamics leading to risks necessitating protective measures like groins which tend to aggravate the problem. Suburban Lekki Peninsula on the south of Lagos metropolis is a large, long barrier island disposed largely to unplanned, accelerated growth since the first residential scheme in 1980 without consideration of its physical dynamics. This study, therefore, evaluated some risks confronting development from the dynamics of the Peninsula with the goal of demonstrating the use of low - budget online data for analysis of coastal hazards and risks. This entails the integration of remote sensing, GIS techniques to assess its characteristics and evaluate risks to development from some hazards inherent in island's physical processes as a typical barrier island on the Lagos coastline. Findings reveal that the area which was hardly built up in 1984 had grown to about 18% in 2014 with Eti-Osa LGA as the most developed at 68.4% and the most low-lying of the three comprising councils. Results further confirm the Peninsula as narrow in a few sections and generally low-lying with 37% between 0.5 - 3m while 63% is between 3 - 5m above mean sea level (MSL). Medium to maximum rates of beach erosion occur mainly in Eti-Osa LGA at about 22.75m/yr around Kuramo Waters, decreasing to 5.5m/yr around Goshen Estate. Projections on coastal erosion on the most erosive area in Eti-Osa LGA from 2013 reveal potential socio-economic impacts on road infrastructure and buildings as ranging from a minimum of N1.16billion to N139.42billion over the next 30 years at present level of development and values. The study concludes that the greatest risk from Barrier Island processes assessed is mainly in Eti-Osa LGA with Kuramo Waters area as the epicentre. Recommendations include the base flood elevation (BFE) and design flood elevation (DFE) to enhance the resilience of future developments. Comparative observations from the literature on the effect of groins on downdrift areas were further made to highlight new risks on the Peninsula.
| Item Type: | Article |
|---|---|
| Subjects: | T Technology > TD Environmental technology. Sanitary engineering |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Uchenna Eneogwe |
| Date Deposited: | 03 Sep 2025 04:05 |
| Last Modified: | 03 Sep 2025 04:05 |
| URI: | http://eprints.gouni.edu.ng/id/eprint/5442 |
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