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Behaviour of a floc population during a tidal cycle: laboratory experiments and numerical modelling ArchiMer
Verney, Romaric; Lafite, Robert; Brun-cottan, Jean Claude; Le Hir, Pierre.
An approach combining laboratory experiments and numerical modelling was used to investigate the behaviour of a floc population during an idealized tidal cycle. The experiment was conducted on suspended sediments at a concentration of 93 mg l−1 collected in the field. It was based on a jar test device to reproduce tidal-induced turbulence and coupled with a CCD camera system and image post-processing software to monitor floc size distribution. At the same time, a 0D size-class based aggregation/fragmentation model (FLOCMOD) was developed to simulate changes in the floc population over the tidal cycle. Experimental results revealed strong variability of the behaviour of microfloc and macrofloc populations with respect to the varying shear rates observed in...
Tipo: Text Palavras-chave: Flocculation; Tidal cycle; Laboratory experiment; FLOCMOD; OD model; Sensitivity analysis; Optimization.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00027/13846/11020.pdf
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Flocculation Potential of Estuarine Particles: The Importance of Environmental Factors and of the Spatial and Seasonal Variability of Suspended Particulate Matter ArchiMer
Verney, Romaric; Lafite, Robert; Brun-cottan, Jean-claude.
Estuarine systems are complex environments where seasonal and spatial variations occur in concentrations of suspended particulate matter, in primary constituents, and in organic matter content. This study investigated in the laboratory the flocculation potential of estuarine-suspended particulate matter throughout the year in order to better identify the controlling factors and their hierarchy. Kinetic experiments were performed in the lab with a "video in lab" device, based on a jar test technique, using suspended sediments sampled every 2 months over a 14-month period at three stations in the Seine estuary (France). These sampling stations are representative of (1) the upper estuary, dominated by freshwater, and (2) the middle estuary, characterized by a...
Tipo: Text Palavras-chave: Seine estuary (France); Kolmogorov microscale; Diatom bloom; Floc structure; Cohesive sediment; Flocculation.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6631.pdf
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Groupement d'Intérêt Scientifique "Suivi des Impacts de l'Extraction de Granulats Marins" (GIS SIEGMA). Compte-Rendu Assemblée Générale 2 juillet 2012 ArchiMer
Desprez, Michel; Chevreau, Pierre; Duclos, Pierre-arnaud; Delpech, Jean-paul; Ernande, Bruno; Lafite, Robert; Le Bot, Sophie; De Roton, Gwenola; Tavernier, Eric; Villanueva, Ching-maria.
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00180/29095/27509.pdf
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In situ high frequency long term measurements of suspended sediment concentration in turbid estuarine system (Seine Estuary, France): Optical turbidity sensors response to suspended sediment characteristics ArchiMer
Druine, Flavie; Verney, Romaric; Deloffre, Julien; Lemoine, Jean-philippe; Chapalain, Marion; Landemaine, Valentin; Lafite, Robert.
The aim of this study is to investigate the complex response of optical turbidity sensors (side- and back-scattering sensors) to Suspended Particle Matter (SPM) characteristics and the consequences when investigating SPM dynamics from long-term high frequency monitoring networks. Our investigation is based on the analysis of a unique dataset of monthly 12 h cycle measurements of SPM characteristics such as turbidity, concentration, floc size distribution, floc density and organic matter content in the macrotidal Seine Estuary (France) between February 2015 and June 2016. Results reveal that despite calibration to a Formazin standard, turbidity sensor response to SPM concentrations (in the range of 7–7000 mg L−1) are strongly variable, from the tidal scale...
Tipo: Text Palavras-chave: Turbidity; Suspended sediment concentration; Optical sensor; Flocs; Long term monitoring.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00431/54227/55550.pdf
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Suspended particulate matter fluxes through the Straits of Dover, English Channel: observations and modelling ArchiMer
Lafite, Robert; Shimwell, Susan; Grochowski, Nicolas; Dupont, Jacques; Nash, Linda; Salomon, Jean-claude; Cabioch, Louis; Collins, Michael; Gao, Shu.
Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to...
Tipo: Text Palavras-chave: English Channel; Straits; Transport mechanisms; Flux; Suspended particulate matter; Manche; Détroit; Mécanismes de transport; Flux; Matières en suspension.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-527.pdf
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