Time Series Analysis of Shoreline Changes along the Coastline of Rivers State, Nigeria
The issue of shoreline changes, due to sea level rise over several centuries, has increasingly become major social, economic and environmental concerns to a large number of coastal countries worldwide. Coastal states in Nigeria, where shoreline changes pose a serious problem to the environment and human settlements, are not exempted. The thrust of the study is to demonstrate the potential of remote sensing, geospatial and statistical techniques in monitoring shoreline changes and sea level rise along the coastline of Rivers state, in South-South region of Nigeria. Multi-resolution and multi temporal satellite images of Landsat were utilized in demarcating shoreline positions during 1984, 2000, and 2016. The time series images were classified and the changes in land use land cover were extracted, and the shore line changes were delineated and extracted using the Digital Shoreline Analysis System extension (DSAS) of the ArcGIS 10.2.1. The study showed that both erosion and accretion were active along almost all
the coastline. It showed that about 70% of the coastline was under erosion within the selected years, while 30% of the region experienced varying magnitude of accretion. High rate of accretion was also observed along the river mouth side of the coast around the bar beach. The results have provided information for proactive measures towards reducing risk by ensuring qualitative and quantitative information on shoreline movement for effective environmental management practices, timely management responses, and salvage the immediate physical environment.
© Department of Geography, Obafemi Awolowo University Ile-Ife, Nigeria 2016