Inlet migration and closure Usually occur in micro-tidal, wave-dominated coastal environments with strong seasonal variations in river flow and wave climate. In the last decades, efforts have been undertaken to identify, classify and quantify these phenomena using conceptual models, empirical relationships and behavior-based models. However, to obtain further insight into the dominant physics requires the application of a process-based model. This study investigates the migration and closure of an idealized tidal inlet system due to wave driven longshore sediment transport. The process-based morphodynamic modeling system Delft3D is applied for this purpose. The ratio of wave energy over tidal prism was changed systematically, through varying the tidal amplitude, tidal basin area and wave characteristics, to investigate the morphological response of the inlet (e.g. closure and migration). The results were compared with Bruun's empirical criteria for overall stability and with Escoffier stability concept. The results clearly indicate that a process-based model is able to reproduce a morphological inlet response consistent with Bruun's criteria and Escoffier's closure curve. A typical example of a migrating tidal inlet due to oblique waves is presented which includes features such as ebb channel formation, migration and welding to the downdrift barrier, and bypassing of ebb shoals. In other cases, inlet closure due to prolongation of the inlet channel and infilling with littoral-drift material is also reproduced.
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The aim of the study was to quantify the effects of the wave period on dune erosion. Attention was focussed on 2D cross-shore effects in a situation with sandy dunes and extreme wave conditions. Large-scale physical model tests were set up to provide the necessary data for the study on a scale as close to prototype as possible. It was concluded that a longer wave period leads to a larger dune erosion volume and to a larger landward retreat of the dune face.

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Recently, the influence of wave periods on dune erosion was studied in a series of large-scale physical model tests. In these tests dune erosion was simulated under extreme storm conditions. The aim of the study presented in this paper was to develop dune erosion prediction methods that take effects of wave periods on dune erosion into account. An existing dune erosion prediction method was used as starting point for the development. The obtained prediction method will be used to evaluate the dunes along the Dutch coast, where longer wave periods occur than previously assumed.@en