Nwilo, Peter C. and Ibe, Chidi A. and Adegoke, J.O and Obiefuna, Jerry and et, al (2020) Long-term determination of shoreline changes along the coast of Lagos. Journal of Geomatics, 14 (1). pp. 72-83.
![[img]](https://eprints.gouni.edu.ng/style/images/fileicons/text.png) |
Text
5.Long-term-determination-of-shoreline-changes 2020.pdf Download (2MB) |
Abstract
Analysis of shoreline changes is an important indicator in the study of coastal erosion and/or accretion. It aids in understanding the spatio-temporal trends in the changes triggered by natural processes and human impacts. The construction of two breakwaters (East and West moles) between 1908 and 1912 at the entrance to Lagos harbor inhibited the natural flow of the longshore drift, hence it accelerated erosion rate especially in the Victoria Island area while areas on the west of the breakwaters were accreting. This study relied on archival maps of 1900 – 1964 and satellite imageries of 2001–2016 to determine and visualize the magnitude of erosion and accretion along the coast of Lagos State. The shoreline positions at various epochs were extracted from the maps and satellite imagery by vectorization. The magnitude of change was determined by calculating the differences in the shoreline positions measured along vertical line segments spaced at 200-meter intervals. Then, the shoreline positions were plotted graphically. The analysis shows a trend of accretion on the western side of the shoreline up to the West mole and massive erosion eastwards of the East mole. However, the high magnitudes of erosion in the Victoria Island axis have been checkmated by the Eko Atlantic City project along with the construction of coastal defenses. Notwithstanding, evidence from recent satellite imagery and analysis of the shoreline changes shows that these anthropogenic interventions have only succeeded in transferring the erosive actions eastwards to areas downdrift of these coastal defenses.
| 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 03:42 |
| Last Modified: | 03 Sep 2025 03:42 |
| URI: | http://eprints.gouni.edu.ng/id/eprint/5441 |
Actions (login required)
 |
View Item |
