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Dynamique sédimentaire multiclasse : de l’étude des processus à la modélisation en Manche ArchiMer
Blanpain, Olivier.
The purpose of this work is the implementation of a sediment transport model in the English Channel. The design of such a model requires the identification of the physical processes, their modelling and their in-situ validation. Because of the sedimentary particularities of the study area, modelling of the mechanical behaviour of a non uniform mixture of sediments and particularly of the fine grains within a coarse matrix is required. This study focused on the characterization of the relevant processes by acquisition of experimental and in-situ data. Data acquired in hydro-sedimentary conditions comparable to those found in the English Channel are scarce. A new instrument and image processing technique were specifically conceived and implemented in-situ to...
Tipo: Text Palavras-chave: Manche; Sédiment multiclasse; Modélisation numérique; Morphodynamique; Charriage; Tri sédimentaire; Mesures in-situ; Traitement d’images; Mesures en canal; English Channel; Graded sediment; Numerical modelling; Morphodynamics; Bedload; Sediment sorting; In-situ data; Image processing; Flume experiments.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00003/11426/7962.pdf
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Effects of short flexible seagrass Zostera noltei on flow, erosion and deposition processes determined using flume experiments ArchiMer
Ganthy, Florian; Soissons, Laura; Sauriau, Pierre-guy; Verney, Romaric; Sottolichio, Aldo.
Innovative flume experiments were conducted in a recirculating straight flume. Zostera noltei meadows were sampled in their natural bed sediments in the field at contrasting stages of their seasonal growth. The aims of this study were: (i) to quantify the combined effects of leaf flexibility and development characteristics of Zostera noltei canopies on their interaction with hydrodynamics; and (ii) to quantify the role of Zostera noltei meadows in suspended sediment trapping and bed sediment resuspension related with changes in hydrodynamic forcing caused by the seasonal development of seagrasses. Velocity within the canopy was significantly damped. The attenuation in velocity ranged from 34 to 87% compared with bare sediments and was associated with a...
Tipo: Text Palavras-chave: Arcachon Bay; Flexible vegetation; Flow modification; Flume experiments; France; Sediment resuspension; Sediment trapping; Zostera noltei.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00244/35507/34016.pdf
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