Land Use and Shoreline Dynamics in Lagos State, Nigeria

Abstract

The city of Lagos, Nigeria has experienced remarkable changes in terms of land use and land cover (LULC) and shoreline changes as a result of increase in population, industrialization and urbanization. These have led to coastal erosion, depletion, loss of settlement and other socio-economic problems. This contribution uses remote sensing technique to delineate coastal changes from 1999-2019 as well as LULC with a view to determine the shoreline dynamics during the study period. Landsat 7 ETM+ and Landsat 8 OLI were acquired and subjected to image pre-processing and processing techniques. The digital shoreline analysis system (DSAS) was employed to delineate the shoreline change parameters, viz: Net Shoreline Movement (NSM), End Point Rate (EPR) and Linear Regression Rate (LRR) of the shoreline for the years 1999, 2009 and 2019 respectively. The LULC result indicate that, bare-land decreases from 0.96-0.45%, vegetation decreases from 53.11-45.25% and water body decreases from 25.58-22.99%, while built-up-area increase from 20.35-31.16%. NSM values for erosion rate ranges from -36.61 to -857.46m/period, while accretion ranges from 72.72 to 260.85m/year. EPR for erosion rate ranges from -1.84 to -2.48m/year, while accretion ranges from 4.64 to 13.04m/year. LRR for erosion rate ranges from -1.83 to -2.47m/year, while accretion ranges from 3.54 to 13.04m/year. The findings revealed shoreline movement toward the sea (accretion) or movement of the shoreline inland (erosion).