Abstract
Particle trajectories in a numerical model of the Western Dutch Wadden Sea are used to study the horizontal mixing processes in this area. The Lagrangian displacement of watermasses appears to be very sensitive to the time of release, the initial position and the initial volume of the watermass considered. The advective component of this displacement agrees with the Eulerian residual currents on relatively large scales. In a Lagrangian sense the small scale Eulerian residual currents only have no physical meaning. With respect to tidal dispersion our results are in conflict with the classical shear dispersion concept in that dispersion occurs without the presence of random motions (turbulence). In our model dispersion is caused by the interaction of longitudinal and lateral velocity variations. These spatial variations are caused by the complexity of the bathymetry that varies over a length that is short compared with the tidal excursion length. Regarding the tidal distortion in more detail, similarities with results from studies on the chaotic aspects of fluid mixing can be recognized, e.g. the extremely fast growth of the perimeter of a watermass and the strong sensitivity of the Lagrangian trajectory of a particle to its initial position.
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Ridderinkhof, H., Zimmerman, J.T.F. (1990). Mixing Processes in a Numerical Model of the Western Dutch Wadden Sea. In: Cheng, R.T. (eds) Residual Currents and Long-term Transport. Coastal and Estuarine Studies, vol 38. Springer, New York, NY. https://doi.org/10.1007/978-1-4613-9061-9_15
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DOI: https://doi.org/10.1007/978-1-4613-9061-9_15
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