Consulta: subjectFacets:"Flume"
Registros recuperados: 5
Data/hora: 10/06/2024 04:48:13

Experimental study of the near-field impact of an oyster table on the flow
Provedor de dados: 5
Autores: Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Facq, Jean-valery; Cayocca, Florence; Lesueur, Patrick.
Oyster farming structures are artificial obstacles which disturb tidal flow and wave propagation. These effects can induce modifications of erosion and sedimentation patterns, turbidity changes, local silting up and can be threatening for the shellfish farming itself. The understanding of the impact of these structures in terms of hydrodynamics and sediment dynamics in the far-field, i.e. at the scale of a bay, is a very challenging task. In order to investigate the far-field impact, it is very important to understand in the first place all the changes which occur at a smaller scale, i.e. at the scale of a single table for a farm consisting of oyster tables made of metallic wire structures on which porous bags of oysters are laid. This work is carried out...
Tipo: Text
Palavras-chave: Sediment dynamics; Roughness length; Boundary layer; Particle Image Velocimetry; Laser Doppler Velocimetry; Flume; Oyster table.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/2010/publication-7389.pdf

Infection characteristics of Himasthla elongata cercariae in cockles as a function of water current
Provedor de dados: 5
Autores: De Montaudouin, X; Wegeberg, Am; Jensen, Kt; Sauriau, Pg.
Digenean trematodes are widespread parasites of marine fauna. The first intermediate host of Himasthla elongata (Echinostomatidae) is the periwinkle Littorina littorea. The second host is less specific, as it includes Various bivalve species. The definitive host is a waterbird. The free-living cercaria acts to ensure transmission from the first and second intermediate hosts. We examined the impact of water flow (still and running water) and host size (6-8, 8-10, 10-12 mm shell length classes) on the settling success of H. elongata cercariae in the second intermediate host by utilizing the common cockle Cerastoderma edule. Under 2 scenarios (free-stream velocity of 0 and 6 cm s(-1)) more than 90% of the experimental population of cockles (90 individuals per...
Tipo: Text
Palavras-chave: Cerastoderma edule; Cercariae; Dispersion; Flume; Himasthla elongata; Metacercariae; Transmission efficiency; Trematode.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/00446/55807/62267.pdf

The influence of sediment cohesiveness on bioturbation effects due to Hydrobia ulvae on the initial erosion of intertidal sediments: A study combining flume and model approaches
Provedor de dados: 5
Autores: Orvain, F; Sauriau, Pierre-guy; Bacher, Cedric; Prineau, Michel.
Laboratory experiments performed in a recirculating flume were designed to quantify the bioturbation influence of the mud snail Hydrobia ulvae, one of the most abundant deposit feeders on European intertidal mudflats. Variations in sediment moisture content that occur between bedforms in shore-normal, ridge and runnel systems of intertidal mudflats were added to the model definition. Sediment erosion thresholds, erosion rates and the microalgal pigment composition of resuspended material were quantified for different H. ulvae densities (0, 1000, 5000, 10 000 and 50 000 snails m(-2)) and applied bed shear stresses. Two different sediment moisture contents were tested. In the absence of macrofauna, recorded turbidities increased up to the maximum applied...
Tipo: Text
Palavras-chave: Model; Flume; Chloropigments; Ridges and tunnels; Mudflat; Sediment; Hydrobia ulvae; Bioturbation; Resuspension.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3774.pdf

The importance of turbulent kinetic energy on transport of juvenile clams (Mya arenaria)
Provedor de dados: 5
Autores: Redjah, I.; Olivier, Frederic; Tremblay, R.; Myrand, B.; Pernet, Fabrice; Neumeier, U.; Chevarie, L.
Soft-shell clam, Mya arenaria, culture on the east coast of Canada is characterized by high loss following seeding. To evaluate the importance of passive transport due to currents, an experimental flume study was designed. The purpose was to measure the effects of hydrodynamic conditions, substrate, and clam size on dispersal in controlled laboratory condition and to interpret these results in relation to field measurements. Unidirectional currents with gradual increasing velocities (0 to 60 cm s(-1)) were applied to three substrates (muddy sand, medium sand, and coarse sand) in which clams from one of three size classes (10, 15, and 20 mm) had burrowed. We also examined the resulting effects of turbulent kinetic energy on the erosion of medium-grain sand...
Tipo: Text
Palavras-chave: Clam transport; Substratum erosion; Unidirectional currents; Turbulence; ADV; Flume.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12507/9368.pdf

Effect of shear velocity and flow regimes on scallop post-larval detachment feed on two different diets
Provedor de dados: 5
Autores: Gagne, Renee; Tremblay, Rejean; Olivier, Frederic; Pernet, Fabrice; Miner, Philippe; Samain, Jean-francois.
Through biological flume experiments, we studied the effect of shear velocity and attachment period on the percent detachment of Pecten maximus post-larvae of different sizes reared on two experimental diets. The first diet, (Pavlova lutheri, Isochrysis galbana, Chaetoceros calcitrans), which served as a reference diet (PTC), is commonly used in bivalve hatcheries; the second is the PTC diet with the addition of Rhodomonas salina (PTCR). Our results indicate that the detachment of post-larvae fed PTCR diet showed significant interactions between scallop length, attachment period and shear stress, while the post-larvae feed with the PTC diet showed only effect of shear stress factor. Furthermore, post-larvae exposed to various flume velocities showed...
Tipo: Text
Palavras-chave: Attachment; Pecten maximus; Benthic boundary layer; Flume; Diet.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00111/22219/20056.pdf