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| Grochowski, Ntl; Collins, Mb; Boxall, Sr; Salomon, Jc; Breton, M; Lafite, R. |
| Sand transport pathways are predicted, by combining outputs from an hydrodynamic numerical model with empirical sediment transport formulae. Tidal simulations, combined with various wind conditions, are compared with patterns presented in the literature. Results show that tides determine the long-term transport pattern in the area; this consists mainly of an ebb-dominated (North Sea towards Channel) mid-Strait region and flood-dominated pathways along the coastlines, which narrow towards the (Dover) Strait. Localised transport paths are identified; these are believed to be responsible partially for the presence of large sandbanks. Superimposed SW and NE wind activity overwhelms the tidally-induced pattern; this occurs infrequently and long-term pattern is... |
| Tipo: Text |
Palavras-chave: ENGLISH CHANNEL; DOVER STRAIT; SEDIMENT DYNAMICS; MODELING; SANDBANKS. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00099/21075/18700.pdf |
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| Amouroux, Jm; Gremare, A; Cahet, G. |
| Changes of radioactivity in a natural C-14 labelled sediment were monitored over a 120-hour period in the presence and in the absence of the deposit-feeding bivalve Abra alba. In both cases, the sediment showed great instability during the first ten hours of the experiment. The consequences of this result on the experimental protocol used for the study of the interactions between natural sediments and deposit-feeders are discussed. In controls, the instability is produced by an initial decrease of radioactivity in the sediment, whereas in the presence of Abra alba, it corresponds to an initial increase of radioactivity. Analysis of previously published data suggests that such responses may result from the inhibition or the stimulation of the bacterial... |
| Tipo: Text |
Palavras-chave: DEPOSIT-FEEDER; MODELING; METHODOLOGY; NUTRITION; C-14. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00102/21278/18887.pdf |
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| Chapalain, G; Smaoui, H; Lepretre, A; Nguyen, Kd; Ouahsine, A; Tessier, B. |
| The present paper deals with the modelling of hydro-sedimentary processes in the coastal area near Cape Gris-Nez and Cape Blanc-Nez (Dover Strait). The modelling procedure consists in coupling different hydro-sedimentary process models with a high spatial resolution two-dimensional tidal flow model (Nguyen and Ouahsine, 1992). The sediment transport models used include two semi-empirical models based on a dimensionless analysis and energetic concepts (Ackers and White, 1973; Engelund and Hansen, 1967), and a more heuristic cu (concentration times velocity) model (van Rijn, 1984 a; b). All these models are applied to predict instantaneous and tidally-integrated sediment transports in the area under investigation. |
| Tipo: Text |
Palavras-chave: DOVER STRAIT; TIDAL CURRENTS; COASTAL SEDIMENTS; HYDRO-SEDIMENTARY PROCESSES; MODELING. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21140/18760.pdf |
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