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Rôles de l'hétérogénéité des sédiments de fond et des interactions houle-courant sur l'hydrodynamique et la dynamique sédimentaire en zone subtidale - applications en Manche orientale et à la pointe de la Bretagne.

Abstract : Hydrodynamic and sedimentary processes are studied in the English Channel, particularly in the southern Dover Straits, and in the Sea of Iroise and the bay of Douarnenez, with emphasis on the effects of spatial heterogeneity of bottom sediments, surface gravity waves via their interaction with current in the bottom boundary layer and wind. The heterogeneity of bottom sediments is ensured through the use of a new spatial interpolation procedure of granulometric distribution. The methodological approach combines and compares field measurements with numerical modelling. Modelling that couples 3D circulation model (COHERENS) and wave propagation model (SWAN), incorporates a set of non-cohesive polydispersive sediment transport equations, a bottom boundary layer wave-current interaction model and various parameterisations of bottom ripples (geometry, friction coefficient), and optimized computation of the near-bed deposition rate. Comparison of results with measurements in the Dover Straits highlights the interaction between the nearshore silty fine sands and the spatio-temporal variability of hydrodynamics under conditions of tide alone and in wind-generated surface gravity waves superimposed on tide. Modelling is then applied to the eastern and central English Channel. In the bay of Douarnenez, the local analysis aims at the modelling of respective effects of tidal currents alone, stormy waves superimposed on tidal currents and wind. Finally, a theoretical study of headland-associated sand bank is performed.
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https://tel.archives-ouvertes.fr/tel-00376679
Contributor : Nicolas Guillou <>
Submitted on : Sunday, April 19, 2009 - 6:13:15 PM
Last modification on : Sunday, October 25, 2020 - 7:06:52 AM
Long-term archiving on: : Thursday, June 10, 2010 - 8:59:02 PM

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  • HAL Id : tel-00376679, version 1

Citation

Nicolas Guillou. Rôles de l'hétérogénéité des sédiments de fond et des interactions houle-courant sur l'hydrodynamique et la dynamique sédimentaire en zone subtidale - applications en Manche orientale et à la pointe de la Bretagne.. Océan, Atmosphère. Université de Bretagne occidentale - Brest, 2007. Français. ⟨tel-00376679⟩

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