Abstract
This paper investigates the predictive capability of a morphodynamic model in capturing the development of a tidal channel on the German North Sea coast which experienced migration in the last few years. A depth-averaged version of a process-based model, Delft3D, is used. A description of the set-up, calibration and validation of the process-based models is presented. Field measurements with a dense spatial and temporal coverage were used for the development of the models. Results from the hydrodynamic and sediment transport simulations were in agreement with observations. The morphodynamic model simulations were speeded up with a morphological acceleration factor in conjunction with a representative period. Results of model calibration and validation covering periods of several years proved the capability of the model to reproduce the migration of the tidal channel. According to the standards usually adopted for checking the accuracy of morphodynamic models, the performance of the model presented here was quite good. The model ability in predicting the migration in the medium-term was found to be dependent primarily on the accuracy of the starting bathymetry, characteristics of the substrata and of the mud sediment fraction as well as on the selection of the representative period. A reduction in the rate of migration of the tidal channel is predicted from 2008 till 2010.References
Boon, J., H. Kerkamp, and L. Dardengo. 2002. Alternative dumping sites in the Ems-Dollard estuary, WL| Delft Hydraulics Report, Z3328.
Latteux, B. 1995. Techniques for Long-Term Morphological Simulation under Tidal Action, Marine Geology, 126, 129-141.http://dx.doi.org/10.1016/0025-3227(95)00069-B
Lesser, G.R., J.A. Roelvink, J.A.T.M. van Kester, and G.S. Stelling. 2004. Development and validation of a three-dimensional morphological model. Coastal Engineering, 51, 883-915.http://dx.doi.org/10.1016/j.coastaleng.2004.07.014
Luthardt, H. (1987). Analyse der Wassernahen Druck- und Windfelder uber der Nordsee aus RoutineBeobachtungen, Hamburger Geophysikalische Einzelzeitschriften, A83, in German.
Mayerle, R. and W. Zielke. 2005. Predictions of Medium Scale Morphodynamics: Promorph Project Overview, Die Kuste, 69, 1-23.
Peet, A.H., J. Sutherland, and R.L. Soulsby. 2002. Skill Assessment in Coastal Models. HR Wallingford.
Poerbandono and R. Mayerle. 2005. Composition and Dynamics of Sediments in Tidal Channels of the German North Sea Coast, Die Kuste, 69, 63-91
Roelvink, J.A. 2006. Coastal morphodynamic evolution techniques. Coastal Engineering, 53, 277-287.http://dx.doi.org/10.1016/j.coastaleng.2005.10.015
Schättler, U., G. Doms, and C. Schraff. 2009. A Description of the Nonhydrostatic Regional COSMOModel. Part VII: User's Guide. Deutscher Wetterdienst. PMid:19706298
Steijn, R.C. 1992. Input Filtering Techniques for Complex Morphological Models, Delft Hydraulics Report, H824.53.
Van Rijn, L.C., D.J.R. Walstra, B. Grasmeijer, J. Sutherland, S. Pan, and J.P Sierra. 2003. The predictability of cross-shore bed evolution of sandy beaches at the time scale of storms and seasons using process based profile models. Coastal Engineering, 47, 295- 327. http://dx.doi.org/10.1016/S0378-3839(02)00120-5
Wilkens, J. 2004. Medium Scale Morphodynamics of the Central Dithmarschen Bight, PhD thesis, University of Kiel, Germany.