Lunchtalk by Stan van den Broek BSc

THE EFFECTS OF STORM SURGES ON DUNE SYSTEMS NEAR INLETS

For better management of the tidal inlet systems,  more knowledge about the hydrodynamic and morphodynamic processes on dune systems near tidal inlets is necessary. In order to get a better understanding of the effects of storm surges on the dune systems near tidal inlet systems, a numerical model (XBeach) is used to simulate variations of the storm surge of 11-1-2017 in one single inlet. The sandflat ‘the Hors’ is located at the south side of the island of Texel (NL), adjacent to the Marsdiep inlet. Simulations in XBeach show strong decreasing wave height on the sea side of the dune system, causing an increased sediment transport and an increase of the waterlevel (wave set-up) on top of the Hors. Transported particles are carried across the Hors where they settle as the water depth increases and the flow velocity decreases. In the sensitivity analysis the maximum waterlevel and waterlevel gradient between inner- and outer part of the inlet were found dominant in the morphological processes on the Hors.