On the 28th of October Dominic Wessels will present the results of his MSc. thesis. The presentation will be in room 027 and starts at 12:15. For his master thesis he used the SWASH model to investigate the influence of an intertidal mussel bed on the spatial variation in wave characteristics. His abstract is shown below.
To obtain more insight in the relation between erosive patterns in mussel beds and the hydrodynamic forcing on a small scale, I modeled the spatial patterns of wave patterns over an intertidal mussel bed at De Cocksdorp, Texel (the Netherlands) using the SWASH model. Data on wave height and topography were obtained during a six-week field experiment in September 2012 near the village De Cocksdorp. The measured data was used as model input and for model validation. Eight cases were defined to study the topographic influence (i.e. depth variations and roughness) of the mussel bed on the spatial wave characteristics. The simulations have shown that the wave distribution over the mussel bed is mainly caused by spatial wave interference as result of refraction. Under regular waves a clear spatial pattern in wave forcing was found because the patches of mussels induce areas with wave energy focusing. Erosion of sediment and mussels are most likely to occur where wave energy converges. These spatial patterns become less pronounced when the incoming waves are more irregular, have more directional spreading and when water depth are larger.