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| Registros recuperados: 13 | |
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| Salomon, J. |
| The movement of water particles in the ocean and littoral zone can be thought of as the result of elementary components superimposed, of which tidal flow is the main factor. Hydrodynamical equations show that these movements are more coupled in the coastal zone than in deep ocean. This characteristic is the result of current intensity, spatial gradients and bottom topography (depth). In the coastal environment tidal flow must be taken into account to study dynamic processes. The tide is not only an alternative movement but is the inducer of a long term current: the residual current. The author uses a bidimensional model to study currents from the depth and vertical structure of residual currents by the effect of density variations. |
| Tipo: Text |
Palavras-chave: Density gradients; Mathematical models; Current prediction; Residual flow; Tidal currents; Lagrangian current measurement; Water circulation. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-1258.pdf |
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| Barrut, Bertrand; Blancheton, Jean-paul; Champagne, Jean-yves; Grasmick, Alain. |
| A study was undertaken to measure the water flow (Qw) delivered by a vacuum airlift designed for recirculating aquaculture systems (RAS) in fresh (<1‰ of salinity) and sea water (35‰ of salinity). The vacuum airlift consists of two concentric tubes connected at their top to a depression chamber. The water rises in the inner tube as a result of air being injected in its lower section and flows back through the external downcomer tube. The vacuum airlift was adjusted at three different lengths: 2, 4 or 6 m and water discharge could be lifted from 0 to 30 cm. Air flow rate (Qg) varied from 0 to 80 L min−1. Different types of air injectors were tested, delivering different bubble sizes (0.1–5 mm) depending on porosity and functioning at low or high... |
| Tipo: Text |
Palavras-chave: Water circulation; Airlift; Vacuum; Aquaculture; RAS; Salinity. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00073/18457/16005.pdf |
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| Alioua. M.; Harzallah, A.. |
| La présente étude a pour objectif la mise en place d’un système de modélisation numérique de la dynamique marine près des côtes tunisiennes. Pour cela on imbrique un modèle de circulation de l’eau près des côtes tunisiennes dans un modèle de circulation générale de la mer Méditerranée. La grille du modèle des côtes tunisiennes comporte la possibilité d’augmenter la résolution dans un domaine ciblé. Les conditions initiales pour ce modèle étiré sont obtenues par interpolation des états simulés par le modèle côtier à résolution constante. Vu sa résolution plus élevée, le modèle à grille étirée nécessite un long temps de calcul. Cependant les tests effectués avec ce modèle montrent que des simulations de 20 jours suffisent pour atteindre un équilibre... |
| Tipo: Journal Contribution |
Palavras-chave: Coastal waters; Mathematical models; Water circulation. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4268 |
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| Atoui., A.; Brahim, M.; Sammari, Ch.. |
| Dans le cadre d’un programme national concernant l’étude de la circulation des eaux dans le littoral tunisien nous avons installé des courantomètres et des houlographes marégraphes dans le golfe de Gabès et notamment à l’Est de Djerba, en face de Ras-Taguermess et au niveau d’El Kantara. L’analyse harmonique des séries temporelles de niveau d’eau au niveau de Ras Taguermess et El-Kantara montre la dominance des composantes de la marée semi-diurne avec prédominance de la composante semi-diurne (M2) de période 12 h 25 mn. L’analyse en composantes principales où en fonction orthogonale empirique (EOF) des courants de la marée montre qu’au niveau d’El- Kantara la vitesse des courants est de 45 cm.s-1 et que sa direction est de 29° par rapport à l’Est ;... |
| Tipo: Journal Contribution |
Palavras-chave: Coastal waters; Current velocity; Harmonic analysis; Tidal currents; Time series; Water circulation; Water currents; Water levels. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4618 |
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| Alexander, R.; Antenucci, J.P.; Attwater, G.. |
| Winam Gulf (Kenya) is a large (surface area ~ 1400 km2) and shallow (<20 m) bay of northeastern Lake Victoria with only one connection to the open lake through Rusinga Channel. To understand the exchange dynamics between Winam Gulf and the offshore waters of Lake Victoria and the hydrodynamics of the region, field studies were carried out from Apr. 22-May 4 and Aug. 5-16 of 2005. A meteorological station (shortwave, total radiation, air temperature, relative humidity, wind speed and direction), thermistor chain (0.75m vertical resolution) and ADCP (40 cm vertical resolution) were deployed in Rusinga Channel in a depth of 20m. Similarly, at an offshore station in northeastern Lake Victoria another thermistor chain was deployed in a water depth of 40 m... |
| Tipo: Proceedings Paper |
Palavras-chave: Hydrodynamics; Physical limnology; Lake dynamics; Current forces; Physical oceanography; Water circulation; Inland waters; Freshwater lakes; Coupled bodies. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1463 |
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| Registros recuperados: 13 | |
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