Dune erosion during storm surges
The realdune/reflex experiment at the sand engine
Paul van Wiechen (TU Delft - Coastal Engineering)
Jantien Rutten (TU Delft - Environmental Fluid Mechanics)
Ryan Mieras (University of North Carolina Wilmington)
Katherine Anarde (North Carolina State University)
Magda Wrobel (North Carolina State University)
Marion Tissier (TU Delft - Environmental Fluid Mechanics)
Sierd de Vries (TU Delft - Coastal Engineering)
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Abstract
Storm conditions can lead to excessive dune erosion with potential floods as a consequence. Barrier islands and low-lying countries protected by dunes are especially vulnerable to dune erosion. To properly assess the risks these areas face, a clear understanding of the physical processes during dune erosion is required.
An international field experiment was conducted to study dune erosion during storm surges from November 6 2021 until January 6 2022. on the Sand Engine. During the Realdune/Reflex experiment, two prototype un-vegetated dunes of 5.5 m high and 150 m long were built just above the high waterline. Due to a different shoreline orientation and nearshore bathymetry, these dunes eroded differently during moderate storm conditions. 3 storms were captured during the campaign.
This abstract presents preliminary results of morphodynamic change during these 3 storms, by means of profile changes and erosion volumes.