Morphological response of tidal basins to human interventions |
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| Institution: | 1. Faculty of Civil Engineering and Geosciences, Section of Hydraulic Engineering, Delft University of Technology, Delft, The Netherlands;2. UNESCO-IHE Institute for Water Education, Delft, The Netherlands;3. Harbour, Coastal and Offshore Engineering, Deltares, Delft, The Netherlands;1. Deltares, Dept. of Coastal and Marine Systems, P.O. Box 177, 2600 MH Delft, The Netherlands;2. Delft University of Technology, Faculty of Civil Engineering and Geosciences, The Netherlands;3. Utrecht University, Dept. Phys. Geography, P.O. Box 80115, 3508 TC Utrecht, The Netherlands;4. Deltares, Dept. Applied Geology and Geophysics, P.O. Box 85467, 3508 AL Utrecht, The Netherlands |
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| Abstract: | This study focuses on the prediction of the long-term morphological evolution of tidal basins due to human interventions. New analytical results have been derived for an existing model ASMITA, Aggregated Scale Morphological Interaction between a Tidal inlet and the Adjacent coast; Stive, M.J.F., Capobianco, M., Wang, Z.B., Ruol, P., Buijsman, M.C., 1998. Morphodynamics of a Tidal Lagoon and adjacent Coast. 8th International Biennial Conference on Physics of Estuaries and Coastal Seas, The Hague, September 1996, 397–407.]. Through linearisation of the model equations a set of time scales is obtained that describe the main features of the morphological evolution of tidal inlets. The magnitude of these system time scales is determined by inlet geometry and sediment exchange processes. The nature and degree of interventions determine which time scales are dominant. We focus on five different tidal inlets in the Wadden Sea. For these inlets, the system time scales have been estimated. The model has been applied to simulate the morphological response of the Marsdiep and Vlie inlets to the closure of the Zuiderzee in 1932. In this way, the model and associated system time scales for each of these inlets have been validated. Results show that in both inlets, the channels display the largest adaptation time. It will take at least a century before the channels and hence the tidal inlet systems reach a new morphological equilibrium. |
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