NUMERICAL MODELLING OF LONG-TERM MORPHOLOGY IN THE SURF ZONE OF THE BELGIAN COAST

Li Wang, Nicolas Zimmermann, Koen Trouw, Bart De Maerschalck, Joris Vanlede

Abstract


Longshore sediment transport in the surf zone plays a considerable role in the long-term morphological behaviour of the Belgian coast. In order to be able to analyse coastal protection measures in the future, a 2D morphology model is developed within the Delft3D software suit using a curvilinear grid which follows the coastline closely. A schematised tide and wave climate is used as boundary conditions for the model. In addition, a constant morphological acceleration factor (MorFac) and the MorMerge online-parallel approach are employed to achieve modelling of the long-term morphology within reasonable computation time. Qualitatively, most major morphological changes are well captured by the model. The modelled sedimentation/erosion is further quantitatively compared with beach erosion/deposition trends of the last 25 years presented in Houthuys (2012). The model still shows a reasonableagreement and its quality is discussed.

Keywords


longshore transport; surf zone; Belgian Coast; morphology model; Delft 3D; MorMerge

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References


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DOI: https://doi.org/10.9753/icce.v34.sediment.42