Subaqueous and Subaerial Beach Changes after Implementation of a Mega Nourishment in Front of a Sea Dike

Sandy nourishments can provide additional sediment to the coastal system maintain its recreational or safety function under rising sea levels. These be implemented at sandy beach systems, but also used reinforce gray infrastructure (e.g., dams, dikes, seawalls). The Hondsbossche Dunes project is a combined shoreface, beach, and dune nourishment of 35 million m3 sand. was built replace flood protection an old sea-dike while creating space for nature recreation. This paper presents evolution this newly created in first 5 years after implementation based on bathymetric topographic surveys, acquired every three six months. A significant coastline curvature by leading erosion central 7 km bordered zones with accretion. However, over five-year period, net volume losses from area were less than 5% initial nourished sand volume. man-made cross-shore profile rapidly mimics characteristics adjacent beaches. slope surfzone adjusted within two winters similar slope. initially wide beaches (i.e., up 225 m) are reduced about 100 m-wide. Simultaneously, has increased foot migrated seaward entire site, regardless whether subaqueous gained lost sediment. Our results show that nourishment, natural positive balance prolonged period placement. As such, forces provided contribution growth related against flooding.