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| 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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| 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. |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00180/29095/27509.pdf |
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| 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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| 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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| Fettweis, Michael; Riethmüller, Rolf; Verney, Romaric; Becker, Marius; Backers, Joan; Baeye, Matthias; Chapalain, Marion; Claeys, Styn; Claus, Jan; Cox, Tom; Deloffre, Julien; Depreiter, Davy; Druine, Flavie; Flöser, Götz; Grünler, Steffen; Jourdin, Frédéric; Lafite, Robert; Nauw, Janine; Nechad, Bouchra; Röttgers, Rüdiger; Sottolichio, Aldo; Van Engeland, Tom; Vanhaverbeke, Wim; Vereecken, Hans. |
| Measurement of suspended particulate matter concentration (SPMC) spanning large time and geographical scales have become a matter of growing importance in recent decades. At many places worldwide, complex observation platforms have been installed to capture temporal and spatial variability over scales ranging from cm (turbulent regimes) to whole basins. Long-term in situ measurements of SPMC involve one or more optical and acoustical sensors and, as the ground truth reference, gravimetric measurements of filtered water samples. The estimation of SPMC from optical and acoustical proxies generally results from the combination of a number of independent calibration measurements, as well as regression or inverse models. Direct or indirect measurements of SPMC... |
| Tipo: Text |
Palavras-chave: Suspended particulate matter; Measurement uncertainty; Regression; Optical and acoustical sensors. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00510/62132/66364.pdf |
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