摘要：coastline of Ondo State (southwest Nigeria) are investigated, between 1972 and 2014.Movements of High Water (HW) shoreline were investigated using the Digital Shoreline Analysis System (DSAS), an ArcGIS extension developed by the USGS.Datasets includes multiple photograph editions from Landsat and Nigeria Satellite Imageries.Shoreline features delineated from each year images included the positions of HW, from which were calculated the Net Shoreline Movement (NSM) and End Point Rate (EPR, the yearly rate of movement).The preliminary results show that the shorelines of Ondo State coastline have experienced a consistent landward movement over the four decades.These changes are attributed to the wave attacks, increasing tide levels in the Atlantic Gulf of Benin, the recent sea- level rise, river canalisation which reduce sediment transportation to coastal zone, the probable historical sand mining and other anthropogenic activities at the coastal zone.
关键词：Shoreline change; GIS; DSAS; shoreline erosion; High Water; Sea-level rise
