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Geometry, fractal dimension and settling velocity of flocs during flooding conditions in the Rhône ROFI ArchiMer
Many, G; Durrieu De Madron, Xavier; Verney, Romaric; Bourrin, F; Renosh, Pr; Jourdin, F; Gangloff, A.
Regions Of Freshwater Influence (ROFI) are of particular interest in a source-to-sink approach in terms of sediment advection, settling, and deposition in the coastal zone. An experiment was carried out in the ROFI of the Rhône River in February 2016 to describe the properties of suspended particulate matter (SPM) during a flood event. A digital holographic camera (LISST-HOLO, 20–2000 μm) was used to estimate the variability of fine sediment floc properties (size, nature and shape) formed in the Rhône mouth. An automatic image toolbox was developed to classify the different constituents of the SPM (as diatoms, bubbles and flocs) and to describe the diversity of floc shapes existing in the material in suspension. We estimated the fractal dimension (DF3D),...
Tipo: Text Palavras-chave: Flocculation; Fractal dimension; Settling velocity; ROFI; Rhone.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00478/58952/61540.pdf
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Modélisation des turbidités en Bretagne sud et validation par des mesures in situ ArchiMer
Tessier, Caroline; Le Hir, Pierre; Dumas, Franck; Jourdin, F.
A hydrodynamic and sediment model of South Brittany is calibrated with ADCP measurements, which allow to estimate hydrodynamic forcing and concentration of suspended particulate matter. The exercise of comparison between observed and simulated concentrations reveals that turbidity is highly dependant on numerous strongly coupled sedimentary and physical processes.
Tipo: Text Palavras-chave: Waves; ADCP; Acoustical backscattering; Modelisation; Turbidity; Vagues; ADCP; Rétrodiffusion acoustique; Modélisation; Turbidité.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-6300.pdf
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