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首页> 外文期刊>Journal of marine environmental engineering >Modelling of Tide and Tidally Induced Hydro-Sedimentary Processes in the Eastern Part of the English Channel
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Modelling of Tide and Tidally Induced Hydro-Sedimentary Processes in the Eastern Part of the English Channel

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This study used a two-dimensional numerical model to study the hydrodynamical regime (tidal and residual currents) in the eastern English Channel and a one-dimensional vertical model to study the processes of suspended sediment transport in this area. The two-dimensional numerical model used nonuni-form grid sizing with local refinement in regions with complex seabed morphology. The model was also applied in conjunction with a Total Variation Diminishing (TVD) numerical scheme to estimate the freshwater width band that characterised a front along the French coast. Results were compared with High Frequency radar velocity measurements of some major tidal constituents: M_2, S_2, N_2, and M_4. Differences observed in the amplitudes (semimajor axis), phases, and orientations of synthesised current ellipses were analysed in detail. Eulerian residual circulation appeared to be sensitive to seabed morphology and revealed a central gyre that was not revealed by previous models. This new feature was also observed using high-frequency measurements. In the one- dimensional vertical model, turbulence generated at the seabed was computed using a two-equation closure describing the time-space evolution of turbulent kinetic energy k and turbulent master length l (k — kl model). The total suspended sediment load predicted by this model was compared to measurement data collected from two levels of the water column.

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