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Registros recuperados: 3
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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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Impact of contaminated sediment elutriate on coastal phytoplankton community (Thau lagoon, Mediterranean Sea, France) ArchiMer
Ben Othman, Hiba; Pringault, Olivier; Louati, Hela; Hlaili, Asma Sakka; Leboulanger, Christophe.
Effects of sediment-released contaminants and nitrogen were assessed on phytoplankton communities sampled from Thau lagoon (France, Mediterranean Sea) and one close offshore marine station. Phytoplankton was exposed to sediment elutriate (seawater containing a mix of metals, organic chemicals, and nutrients) or to ammonium enrichment for four days using immersed microcosms exposed to natural conditions of light and temperature. Functional (production - respiration balance) and structural (taxonomy and cell densities) responses of the phytoplankton community were assessed. In the lagoon, both treatments stimulated phytoplankton growth, compare to controls. Conversely in the offshore station, the phytoplankton growth was stimulated only with the sediment...
Tipo: Text Palavras-chave: Sediment resuspension; Mediterranean lagoon; Contaminants; Nutrients; Phytoplankton community.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00352/46364/46317.pdf
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Trawling-induced resuspension and dispersal of muddy sediments and dissolved elements in the Gulf of Lion (NW Mediterranean) ArchiMer
De Madron, X; Ferre, B; Le Corre, Gildas; Grenz, C; Conan, P; Pujo Pay, M; Buscail, R; Bodiot, O.
A dedicated trawling experiment was performed at three sites on the Gulf of Lion continental shelf, with the aim of assessing the resuspension of particulate and dissolved matter triggered by different types of trawls on muddy sediments. The different configurations were: (i) bottom trawl, with bobbin for ground rope (Rockhopper): (ii) bottom trawl, without bobbin (Medits); and (iii) pelagic trawl, towed at 1 and 10m above the seabed. The plumes of resuspended sediment were measured using the acoustic backscattered intensity, from a towed ADCP. Concomitant profiles of particle size-distribution, light transmission and water samples were collected, outside and inside the plumes. The analysis of the data enabled derivation of the major physical and...
Tipo: Text Palavras-chave: Northwestern Mediterranean Sea; Gulf of Lion; Suspended particulate matter; Sediment resuspension; Cohesive sediments; Bottom trawling; Coastal fisheries.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1355.pdf
Registros recuperados: 3
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