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Two-dimensional modeling of fine sediment transport with mixed sediment and consolidation: Application to the Gironde Estuary,France

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International Journal of Sediment Research 2021年第6期36卷 736-746页

作者： Sylvain Orseau Nicolas Huybrechts pablo tassi Damien Pham Van Bang Fabrice Klein Cerema Direction Technique Eau Mer et Fleuves Sorbonne Universités Université de Technologie de Compiégne CNRSFRE2012 RobervalCentre de Recherche Royallieu Electricité de France R&D Department Laboratoire d'Hydraulique Saint Venant (ENPC-EDF/R&D-CEREMA) 5. Centre Eau Terre et Environnement INRS-ETE 6. Grand Port Maritime de Bordeaux

In order to optimize ship navigation in the macrotidal Gironde Estuary, a recent project funded by the port of Bordeaux aims at better understand and forecast hydrodynamic and fine sediment transport within the estuary. In the framework of this project, a two-dimensional hydro-sedimentary model is built. The model includes hydrodynamic forcings, mixed-sediment transport, and consolidation processes. The harmonic analysis of the astronomical tides reveals a strong distortion of the tidal wave inducing the growth of overtide constituents and the non-significant effect of tide-surge interactions in annual-scale prediction. Depending on hydrological conditions, river discharge can considerably alter the model accuracy due to the migration of the turbidity maximum zone modifying the bottom *** with measurements shows the ability of the model to reproduce suspended-sediment concentrations in the central Estuary. Sensitivity of the model to sediment features has also been discussed in regard of suspended-sediment concentrations and fluid mud deposits. The model will be further coupled with ship squat predictions and a morphodynamic model.

关键词： Sediment transport Numerical modeling Mixed sediment Gironde Estuary Opentelemac

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Effect of self-weight consolidation on a hydro-sedimentological model for the Río de la Plata estuary

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International Journal of Sediment Research 2019年第5期34卷 444-454页

作者： pablo Santoro Mónica Fossati pablo tassi Nicolas Huybrechts Damien Pham Van Bang Ismael Piedra-Cueva Instituto de Mecánica de los Fluidos e Ingeniería Ambiental Facultad de Ingeniería Universidad de la República Université Paris-Est Laboratory for Hydraulics Saint-Venant (ENPC-EDF/R& D-CEREMA) Electricity of France R&D Department Sorbonne Universités Université de Technologie de Compiègne FRE UTC-CNRS 3023 Roberval Centre de Recherche Royallieu Cerema Direction Technique Eau Mer et Fleuves Institut National de la Recherche Scientifique Centre-Eau Terre Environnement

The effect of the consolidation process on the morphodynamics and fine sediment dynamics of the Río de la Plata estuary is explored through a circulation-wave-sediment transport model. The consolidation model is calibrated based on settling column experimental data. Different simulations are done in order to initialize the mud layer distribution and to investigate the impact of different erosion parameter assumptions on the modeled sediment dynamics. Finally a two-year simulation is done with and without the consolidation process and realistic hydrodynamic forcings. Considering the consolidation process, the model correctly reproduces measured vertical density profiles in the Montevideo Bay access channel. The simulated suspended sediment dynamics behavior in Montevideo Bay with the consolidation process provides a more realistic deposition pattern in regard to the dredging activities.

关键词： Cohesive sediment Self-weight consolidation Morphodynamics Numerical modeling

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