Modelled channel patterns in a schematized tidal inlet |
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| Authors: | DMPK Dissanayake JA Roelvink M van der Wegen |
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| Institution: | aUNESCO-IHE, Institute for Water Education, PO Box 3015, 2601 DA Delft, The Netherlands;bDeltares, PO Box 177, 2600 MH Delft, The Netherlands |
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| Abstract: | Tidal inlets in the Dutch Wadden Sea show typical morphological features, i.e. westward oriented main inlet channel and ebb-tidal delta. The objective of this study is to find the governing physical processes of these morphological features. The study uses a 2DH process-based morphodynamic model (Delft3D) on a schematized model domain, with dimensions similar to the Ameland inlet in the Dutch Wadden Sea.Starting from a flat bed the models are forced by tides only. Short-term simulations are made to explore the hydrodynamic characteristics and initial sedimentation and erosion patterns. Long-term morphodynamic simulations are employed to investigate the governing parameters of the main inlet channel and the ebb-tidal delta evolution. Sensitivity of the evolution is described in terms of initial inlet width (1.0 km and 3.5 km), direction and asymmetry of tidal forcing (M2, M4), transport formulations (Van Rijn, 1993; Engelund and Hansen, 1967) and relative position of the tidal basin with respect to the inlet (East (existing), Middle, and West).The results tend to produce morphological features typical to the Ameland inlet. The direction of tidal forcing is the main governing parameter to the present orientation of the main inlet channel and the ebb-tidal delta. The model results generally prove the conceptual hypotheses that describe the orientation of the main inlet channel and the ebb-tidal delta. |
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| Keywords: | Long-term evolution Ebb-tidal delta Inlet channel Tidal currents Ameland inlet Wadden Sea |
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