COASTAL EROSION AT KETA LAGOON, GHANA - LARGE SCALE SOLUTION TO A LARGE SCALE PROBLEM

Abstract

This paper describes the development of a solution to a large scale, long term erosion process along the Atlantic coast of eastern Ghana in West Africa. The understanding of the erosion process was developed through a combination of geomorphic investigations and numerical and physical modeling of coastal processes. Key aspects of the investigations are described in this paper. The performance of the adopted sea defence system, consisting of rubblemound structures and beach nourishment, was evaluated using the GENESIS and COSMOS numerical models of shoreline change. The numerical models were also used to modify the sea defence system such that an acceptable level of downdrift impact was confined within the study area.