A large beach replenishment project in Dunkirk, France used sand from a navigation channel to build up the beach and protect nearby residential areas from flooding. Over 2 years, about 9.2% of the sand eroded, with most of it moving eastward. This redistribution of sand benefited a neighboring beach popular for recreational activities. Waves and currents were found to be the main factors influencing the movement of sand along the coast. The study also showed a decrease in erosion after the first year, indicating that the beach shape was adjusting towards a more stable state.