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Tidally-induced shear stress variability above intertidal mudflats in the macrotidal Seine estuary ArchiMer
Verney, Romaric; Brun Cottan, J; Lafite, R; Deloffre, J; Taylor, J.
Tidal currents and the spatial variability of tidally-induced shear stress were studied during a tidal cycle on four intertidal mudflats from the fluvial to the marine part of the Seine estuary. Measurements were carried out during low water discharge (< 400 m(3) s(-1)) in neap and spring tide conditions. Turbulent kinetic energy, covariance, and logarithmic profile methods were used and compared for the determination of shear stress. The c(TKE) coefficient value of 0.19 cited in the literature was confirmed. Shear stress values were shown to decrease above mudflats from the mouth to the fluivial part of the estuary due to dissipation of the tidal energy, from 1 to 0.2 N m-(2) for spring tides and 0.8 to 0.05 N m(-2) for neap tides. Flood currents...
Tipo: Text Palavras-chave: Seine estuary (France); Spatial variability; Neap spring conditions; Intertidal mudflat; Shear stress; Tidal currents.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1887.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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