Numerical Model of the Impact of Submerged Breakwater on Shoreline Evolution of Bona Beach, France

The Bona beach, one of the beautiful sandy beaches along the eastern Giens double tombolo, is experiencing with severe coastal erosion which menaces its existence as well as many seaside properties on it. Submerged breakwaters (SBWs) are applied to this beach for the purpose of halting or at least limiting coastal erosion, stabilize the shoreline and to promote beach expansion by the formation of salient. SBWs are designated as the most rational measure for beach protection because of a number of outstanding advantages such as not destroying the landscape, not interfering the seaward vision, not reducing beach amenity and minimizing the negative impacts on the surrounding marine environment. These esthetic features are very necessary to maintain the tourist values of sandy beaches. In this study, the one-line numerical model of LITLINE is used to uncover the impact of SBWs on morphological evolution. The numerical results confirm that SBWs have certain effectiveness in protecting the Bona beach in different wave conditions.