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Registros recuperados: 16
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Analyse harmonique des séries chronologiques des niveaux d’eau et des courants au niveau de RasTaguermess et à el kantara dans le golfe de Gabès OceanDocs
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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Analysis of tidal and residual currents across semi-enclosed bay mouth based on shipboard ADCP measurements. OceanDocs
Li, Xibin; Sun, Xiaoyan; Yao, Zhigang.
Based on 25 hours shipboard ADCP measurements across semi-enclosed bay mouth(Kemen Channel), time series of tidal currents over 12 sites, which distribute evenly along the transect, were constructed to improve our understanding of tidal characteristics and residuals in this region. The tidal currents in Kemen Channel were identified as the regular semidiurnal and reversing tidal flows, with its behaviour more like standing waves. Moreover, the flood currents in the lower layers were found to be ahead of that in the upper layers and vice versa for ebb tides. The major of tidal ellipse for M2 constituent was found to be larger close to the southern side of the channel, with its incline also increasing toward the south. The signs of M4 constituent were also...
Tipo: Journal Contribution Palavras-chave: Tidal currents; Residual currents; Transport.
Ano: 2012 URL: http://hdl.handle.net/1834/5847
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Approche de la circulation residuelle en Baie de Seine ArchiMer
Lehir, P; Salomon, J; Leprovost, C; Chabertd'Hieres, G; Mauvais, J.
By taking into account salinity measurements and consequently mean residence time, current measurements, tidal computation with a 2-D model and wind induced currents provided by a 3-D model, a global diagram of residual flow in Seine Bay is given. Main patterns are exhibited: density currents in the eastern part of the bay, off the Seine Estuary, wind induced circulation, especially along the coast and over the Channels, and tidal residual patterns induced by topography.
Tipo: Text Palavras-chave: Simulation; Modelling; Wind driven circulation; Bottom topography; Density gradients; Water masses; River discharge; Haline circulation; Salinity gradients; Tidal currents; Residual flow.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1263.pdf
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Capacidad de transporte de la constricción de Meninea para un flujo de dos capas y el efecto de la corriente de marea OceanDocs
Salinas, S.; Hormazábal, S..
En la primavera de 1995, se instaló un anclaje con dos correntómetros sobre el umbral de la constricción de Meninea para un análisis inicial de corrientes. El experimento fue parte del programa multidisciplinario Cimar 1 Fiordos. Durante 61 días se obtuvo las mediciones cada 30 minutos. Los correntómetros estaban instalados a 25 m y 40 m bajo la superficie del mar, en la profundidad de 60 m. La velocidad promedio fue de 15,9 cms-1 hacia el norte en el correntómetro superior y de 2,0 cms-1 hacia el sur en lo profundo. La variabilidad de las corrientes fue dominada por la corriente de marea de tipo semidiurno M2. Debido a la corriente de marea, crece la capacidad de transporte de la constricción con respecto al sistema de dos capas. El tiempo de residencia...
Tipo: Journal Contribution Palavras-chave: Fjord dynamics; Fjords; Transport; Tides; Tidal currents; Current measurement; Current meters; Fjords; Transport; Tides; Http://aims.fao.org/aos/agrovoc/c_16314; Http://aims.fao.org/aos/agrovoc/c_7874; Http://aims.fao.org/aos/agrovoc/c_7764.
Ano: 2004 URL: http://hdl.handle.net/1834/3104
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Courantologie calculee en Baie de Seine ArchiMer
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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Dynamique de comblement d'un bassin sédimentaire soumis à un régime mégatidal : Exemple de la Baie du Mont-Saint-Michel ArchiMer
Ehrhold, Axel.
This work has been performed in a DRET/CNRS convention and related to the problems of sedimentary dynamics in a bay dominated by tidal currents. It combines the descriptive study of the morphosedimentary units with the modeling of bedload processes. At the South channel Isles, the Mont-Saint-Michel bay is well known for his exceptional tidal range. It's open to the offshore with two broad master channels on both sides from the Chausey's archipelago. On the coarse sedimentary cover of pebbles and gravels, sediments dynamic series of some plurikilometres sandy ribbons. These sands are temporarily stocked in lonely bedforms and in coastal maritime banks, sandwaves field of Granville and tide delta. The coastal banks are connected in the littoral prism. They...
Tipo: Text Palavras-chave: Bedload transport; Hydrodynamic numerical model; Sediment color; Crepidule; Coastal banks; Sandwaves; Sand ribbons; Swells; Tidal currents; Sedimentary prism; Norman breton Gulf; Transport solide; Code numérique; Couleur des sédiments; Crépidule; Bancs côtiers; Dunes tidales; Rubans sableux; Houle; Courants de marée; Prisme sédimentaire; Golfe normand breton.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/these-3232.pdf
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Evaluation of GlobCurrent surface ocean current products: A case study in Australia ArchiMer
Cancet, Mathilde; Griffin, David; Cahill, Madeleine; Chapron, Bertrand; Johannessen, Johnny; Donlon, Craig.
Australia's marginal seas include a wide range of ocean current regimes ranging from tide-dominated in the North-West where the continental shelf is wide, to boundary current- and eddy-dominated in the South-East, where the shelf is narrow. Here, we take the opportunity to test the GlobCurrent surface ocean current products against in-situ observations in these two contrasting regimes. Observations by Acoustic Doppler Current Profiler (ADCP) instruments of Australia's Integrated Marine Observing System (IMOS) and drifting buoys of the Global Drifting Programme (GDP) are used. The monthly-timescale variability of the GlobCurrent alongshore current component is in moderately good agreement with the observations on the continental shelf in the South-East but...
Tipo: Text Palavras-chave: Surface ocean currents; GlobCurrent assessment; East Australian Current; Tidal currents; In situ measurements.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00464/57607/60173.pdf
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Marine influence in the Barreiras Formation, State of Alagoas, northeastern Brazil Anais da ABC (AABC)
Rossetti,Dilce F.; Góes,Ana M..
Tidal processes were important for deposition of the Barreiras Formation located in northern Brazil, while correlatable deposits in northeastern Brazil have been traditionally related to continental environments. Facies analysis in southern Alagoas revealed that the Barreiras Formation consists of cross-stratified conglomerates and sandstones (facies Sx and Cgx), compound cross-stratified sandstones (facies Cx), and heterolithic beddings (facies H). A significant portion of these deposits occurs within channel morphologies displaying fining and thinning upward successions. An abundance of sedimentary features is comparable to those from the northern Brazilian counterpart. These include: tidal bundles; herringbone cross-stratification; heterolithic beddings...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Miocene; Marine transgression; Tidal currents; Sedimentary structures; Northeastern Brazil.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000400012
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Modele tridimensionnel de circulation et de dispersion ArchiMer
Thouvenin, Benedicte; Salomon, J.
Bottom topography, coastal morphology and density variations are the three factors influencing marine current flow in Seine Bay. Numerical modeling allows the study of this tridimensional structure.
Tipo: Text Palavras-chave: Hodographs; Salinity gradients; Coastal zone; Bottom topography; Mathematical models; Tidal currents; Dispersion; Water circulation.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1260.pdf
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Modeles mathematiques de courants residuels sur le plateau continental nord europeen ArchiMer
Djenidi, S; Nihoul, J; Ronday, F; Garnier, Antonin.
To study residual currents the authors use mathematical models. The introduction deals with parameters having an influence on this process in the North sea and adjacent seas (shallow environments): tidal residual circulation, limit conditions and winds. Several maps give a representation of results.
Tipo: Text Palavras-chave: Tidal currents; Wind driven circulation; Boundary conditions; Mathematical models; Continental shelves; Residual flow.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1270.pdf
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Observations de courant en Baie de Seine ArchiMer
Lehir, P; L'Yavanc, J.
Results of long-term current measurements in the Seine Bay are presented: (1) tidal flow and propagation of the tide across the bay; (2) ability to predict tidal currents from previous measurements by the means of harmonic analysis; (3) identification of residual flow factors according to a principal component analysis in a complex space; (4) description of the tidal residual flow with large eddies; (5) demonstration of wind effects on currents.
Tipo: Text Palavras-chave: Meteorological observations; Mathematical models; Long term records; Residual flow; Current prediction; Tidal currents; Water circulation; Current observations.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1257.pdf
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Quantifying Tidal Fluctuations in Remote Sensing Infrared SST Observations ArchiMer
González-haro, Cristina; Ponte, Aurelien; Autret, Emmanuelle.
The expected amplitude of fixed-point sea surface temperature (SST) fluctuations induced by barotropic and baroclinic tidal flows is estimated from tidal current atlases and SST observations. The fluctuations considered are the result of the advection of pre-existing SST fronts by tidal currents. They are thus confined to front locations and exhibit fine-scale spatial structures. The amplitude of these tidally induced SST fluctuations is proportional to the scalar product of SST frontal gradients and tidal currents. Regional and global estimations of these expected amplitudes are presented. We predict barotropic tidal motions produce SST fluctuations that may reach amplitudes of 0.3 K. Baroclinic (internal) tides produce SST fluctuations that may reach...
Tipo: Text Palavras-chave: Sea surface temperature; Satellite observations; Tidal currents; Internal tides.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00589/70075/68048.pdf
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Sur l'hydrodynamique de la Baie de Seine. Resultats d''observations et de modelisations ArchiMer
Leprovost, C; Fornerino, M; Villaret, C.
Study of Seine bay hydrodynamics can't be separated from the Channel and continental shelf. The authors' modellings are aimed at the study of this global ladder and the insertion of coastal areas such as the Seine Bay in this context. Two 2-D models are used. One covers only the Channel, and the other from Pas-de-Calais to continental shelf limits including Celtic sea, Channel and southern North Sea. The results are comparated with long time current observations.
Tipo: Text Palavras-chave: Current data; Mathematical models; Modelling; Tidal currents; Current prediction; Water circulation; Hydrodynamics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1259.pdf
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The tides and tidal circulation of Todos os Santos Bay, Northeast Brazil: a general characterization Anais da ABC (AABC)
LESSA,GUILHERME C.; DOMINGUEZ,JOSÉ M. L.; BITTENCOURT,ABÍLIO C.S.P.; BRICHTA,ARNO.
The Todos os Santos Bay, located on northeastern Brazil, is the second largest coastal bay in the country, after São Marcos Bay. The three main drainage basins convey an average of 120 m³/s of freshwater towards the bay, the majority of it, however, held by a dam in Paraguaçu River since 1985. The original average freshwater inflow was two orders of magnitude smaller than the estimated tidal discharge through the main bay entrance, and the oceanographic characteristics of the bay, as indicated by bay salinity measurements, are clearly marine. The tides are semi-diurnal, and are amplified up the bay by a factor of 1.5. Shallow water constituents become more important as the tide propagates along Paraguaçu Channel and Paraguaçu River, where they generate...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tides; Baía de Todos os Santos; Tidal currents.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200009
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Tidally-induced shear stress variability above intertidal mudflats in the macrotidal Seine estuary ArchiMer
Verney, Romaric; Brun Cottan, J; Lafite, R; Deloffre, J; Taylor, J.
Tidal currents and the spatial variability of tidally-induced shear stress were studied during a tidal cycle on four intertidal mudflats from the fluvial to the marine part of the Seine estuary. Measurements were carried out during low water discharge (< 400 m(3) s(-1)) in neap and spring tide conditions. Turbulent kinetic energy, covariance, and logarithmic profile methods were used and compared for the determination of shear stress. The c(TKE) coefficient value of 0.19 cited in the literature was confirmed. Shear stress values were shown to decrease above mudflats from the mouth to the fluivial part of the estuary due to dissipation of the tidal energy, from 1 to 0.2 N m-(2) for spring tides and 0.8 to 0.05 N m(-2) for neap tides. Flood currents...
Tipo: Text Palavras-chave: Seine estuary (France); Spatial variability; Neap spring conditions; Intertidal mudflat; Shear stress; Tidal currents.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1887.pdf
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Tides, tidal currents and their effects on the intertidal ecosystem ofthe southern bay, lnhaca Island, Mozambique OceanDocs
Rydberg, L.; de Boer, W.F.; Saide, V..
Sediment characteristics and tidal currents were studied in the 1500 ha intertidal area south of Inhaca Island, Mozambique. Thetide is semi-diurnal with a range at spring of about 3 m. The area connects directly to the ocean through the Ponta Torres Straitand (indirectly) through several narrow tidal channels ending up in Maputo Bay. Velocities of up to 0.75 m s-1 were measured in the Ponta Tones strait. After Low Water, Indian ocean water starts entering the tidal flats, while entrance from the MaputoBay side is delayed by one to several hours. With only one tide gauge and one current meter at hand, we found indications of ahigher mean sea level on the oceanic side (probably due to ocean wave set up) and a mean flow in the Ponta Torres Straitdirected...
Tipo: Journal Contribution Palavras-chave: Tidal currents; Ecosystems.
Ano: 2000 URL: http://hdl.handle.net/1834/701
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