Morphodynamic upscaling with the MORFAC approach: Dependencies and sensitivities |
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| Authors: | Roshanka Ranasinghe Cilia Swinkels Arjen Luijendijk Dano Roelvink Judith Bosboom Marcel Stive DirkJan Walstra |
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| Institution: | 1. Department of Water Engineering, UNESCO-IHE, PO Box 3015, 2601 DA Delft, The Netherlands;2. Civil Engineering and Geosciences, Technical University of Delft, PO Box 5048, 2600 GA Delft, The Netherlands;3. Harbour, Coastal and Offshore Engineering, Deltares, PO Box 177, 2600 MH Delft, The Netherlands |
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| Abstract: | The recently developed Morphological Acceleration Factor (MORFAC) approach for morphodynamic upscaling enables numerical model simulations of coastal evolution at decadal to millennial time scales. Primarily due to the massive increase in modeling time scales it affords, the MORFAC approach is now standard in state-of-the-art commercially available coastal morphodynamic modeling suites. However, the general validity of the MORFAC concept for coastal applications has not yet been comprehensively investigated. Furthermore, a robust and objective method (as opposed to the subjective and inelegant trial and error method) for the a priori determination of the highest MORFAC that is suitable for a given simulation (i.e. critical MORFAC) does not currently exist. This communication presents some initial results of an ongoing, long-term study that attempts to rigorously and methodically investigate the limitations and strengths of the MORFAC approach. Based on the results of a strategically designed numerical modeling exercise using the morphodynamic model Delft3D, two main outcomes are presented. First, the main dependencies and sensitivities of the MORFAC approach to fundamental forcing conditions and model parameters are elucidated. Second, a criterion based on the Courant–Friedrichs–Levy (CFL) condition for bed form propagation that maybe used as a guide to determine the critical MORFAC a priori is proposed. |
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| Keywords: | Morphodynamic modeling MORFAC Delft3D Long term coastal evolution |
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