CONTINUOUS FIELD MEASUREMENTS OF DUNE SLUMPING DURING STORM SURGES

On sandy coastlines, dunes frequently serve as the main line of defense against coastal storms. During a storm, wind and wave setup result in an increased water or surge level, which submerges the beach, allowing waves to collide with and impact the dune face (van Wiechen et al., 2023a). As a consequence, masses of sediment become unstable and these masses, henceforth called slumps, slide down the dune face. These slumps temporarily defend the dune face until they are suspended in the water column and transported offshore by waves and currents, leaving room for new slumps to slide down. (van Gent et al., 2008). This cycle can persist until waves finally wash over the remaining dune, leading to dune failure. This study presents new data of the dune slumping process collected during the RealDune/REFLEX field experiments.