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A statistical relationship between individual heights and periods of storm waves ArchiMer
Cavanie, Alain; Arhan, X; Ezraty, X.
The goal of this short communication is to present a theoretical joint probability distribution for wave heights and periods developped in 1975 at the Centre 0céanologique de Bretagne. This research program was proposed and financially supported by the Association de Recherche Action des Elements (group fomed of 9 french companies or government agencies) which also carried out analysis of 200 twenty minute storm wave recordings in the North Sea selected from Waverider data kindly placed at our diaposal by the United Kingdom Offshore Operators Association. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5183.pdf
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Application à la zone au large du Finistère d'une méthode d'estimation statistique des courants de houle au voisinage du fond ArchiMer
Cavanie, Alain.
The spectral energy distribution of sea waves is supplied four times a day by the French Meteorological Office's DsAs model using the pressure distribution over the atlantic as input. The surface-motion spectrum furnished by the model may then be used to estimate the local current spectrum near the sea bed. The present study is based on four years (1970-1974) of DSAs data for the so-called Brittany point (47"30 N. 5"W). The data correlates reasonably well with observations made from ships in the region lying between 40 - 50 N and O - 10 W (Figure 1) . . . Plotted on Weibull paper in Figure 2 are the cumulative probability values of U as calculated from the DSAs data (U is the mean of the upper third of maximum current values at a depth of 100 m). The...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1975 URL: http://archimer.ifremer.fr/doc/1975/publication-5089.pdf
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Effets des termes non-linéaires dans les écoulements non-stationnaires à deux couches ArchiMer
Arhan, M.; Cavanie, Alain.
Current and temperature measurements at different spots, offshore and on continental shelves, have shown internal waves propagating through the stratified waters of the ocean. In some regions, these waves have such amplitudes that it appears difficult not to take into account the non-linear terms in the equations and the conditions to the limits governing these flows.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1974 URL: http://archimer.ifremer.fr/doc/1974/publication-5436.pdf
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Equations des ressauts internes dans un système à deux couches et leurs solutions ArchiMer
Cavanie, Alain.
Différents écoulements océanographiques, météorologiques ou industriels peuvent être décrits par des modèles théoriques ou expérimentaux formés de deux couches fluides superposées. Dans les cas où l'hypothèse des ondes longues est justifiée (hypothèse de pression hydrostatique), ces écoulements sont décrits par un système hyperbolique d'équations aux dérivées partielles non linéaires, sous réserve que les grandeurs caractérisant les écoulements ainsi que leurs dérivées premières satisfassent à un certain nombre de conditions de continuité. De même que pour les écoulements de surface où de la dynamique des gaz, il est intéressant d'étudier les relations qui relient de part et d'autre des surfaces de discontinuités, les grandeurs physiques qui...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1973 URL: http://archimer.ifremer.fr/doc/1973/publication-5144.pdf
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Etude des courants et de la marée à la limite du plateau continental d'après les mesures effectuées pendant la campagne "golfe de gascogne 1970" ArchiMer
Cavanie, Alain; Hyacinthe, Jean-louis.
The "Golfe de Gascogne 1970" (Bay of Biscay 1970) cruise of the "Fluid environment" branch of the Scientifc department of the C.O.B. enabled various tidal current and tide height measurements on the 200 m bathymetric line of the Bay of Biscay between 44°N and 48°N.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/rapport-4944.PDF
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Etude statistique de la houle littorale proche du déferlement ArchiMer
Cavanie, Alain; Ezraty, Robert.
The analysis of two sets of wave measurements close to shore verifies that as long as wave amplitudes are small with respect to mean depth a Rayleigh distribution remains satisfactory for wave heights. When mean depth is inferior to three times the significant wave heights, the statistical distribution of wave heights is best fit by Weibull's law whose exponent is an increasing function of relative wave height. All three parameters of Weibull's law can be rapidly estimated from Hr, Hr1/3 and Hr1/1O. [NOT CONTROLLED OCR]
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5078.pdf
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Evaluation de la mesure de la direction des vagues à partir des données d'une bouée instrumentée ArchiMer
Ezraty, Robert; Cavanie, Alain.
The pitch and roll buoy developped at CNEXO-COB to measure directional spectra of waves (following the method employed by Cartwright, Longuet-Higgins and Smith) uses recently manufactured sensors for pitch, roll, heave and direction which give it a large autonomy. This article presents an evaluation of the validity of measurements obtained with this instrument during the Marsen expriment in the North Sea. To do this, we have sought to determine the errors arising at different stages of the acquisition and analysis of data : sensor calibrations, influence of numerical analysis (filtering) and Doppler effects due to tidal currents. The redundancy in the simultaneous measurements of the vertical displacements and the two components of slope of the sea...
Tipo: Text
Ano: 1981 URL: http://archimer.ifremer.fr/doc/1981/publication-5324.pdf
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Evolution of the passive and active microwave signatures of a large sea ice feature during its 2 1/2-year drift through the Arctic Ocean ArchiMer
Gohin, Francis; Cavanie, Alain; Ezraty, Robert.
Although estimation of the total ice concentration from special sensor microwave imagers (SSM/I) has proven to be successful, none of the various algorithms developed to discriminate new and older ice provide satisfying results. While the strong contrast between the emissivity of sea ice and that of open water can be utilized to provide reliable estimators of the total ice concentration, passive microwave characteristics of second-year and multiyear ice may locally evolve in different ways, even during the cold season. Scatterometers, as the active microwave instrument in wind mode (AMI-wind) on board the European Remote Sensing Satellites (ERS), provide backscatter data which have a higher sensitivity to the surface topography of ice and a better...
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Ano: 1998 URL: http://archimer.ifremer.fr/doc/00447/55848/58406.pdf
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La houle déferlante et son action ArchiMer
Cavanie, Alain.
The breaking of waves is probably the most spectacular phenomenon linked to sea swell for the average coastal walker, even if he does not know anything about the mechanisms involved. For the oceanographer, it is a hydrodynamic non-linear, non-stationary phenomenon, which depends on the bottom slope and on the nature of the offshore swell. For the engineer, it is a source of destructive forces (evaluated in tens, if not hundreds of tonnes per square metre of building) which has to be anticipated and mastered.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1974 URL: http://archimer.ifremer.fr/doc/1974/publication-5428.pdf
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Modèle non linéaire et non hydrostatique appliqué à l'étude des fronts internes dans le détroit de gibraltar ArchiMer
Cavanie, Alain.
In a previous article (1969), the author demonstrated, through the use of a hydrostatic model and of the Boussinesq hypothesis, the importance of some non-linear terms in the formation of inner fronts; this model provides a criterion for the easing and intensification of the slope of a simple wave according to the wave's upshore conditions. In this article, the use of a regular perturbation method enables us to free ourselves both from the long wave hypothesis and from the Boussinesq hypothesis. The theoretical model we created demonstrates the importance of non-linear terms in the formation of secondary oscillations upshore from the front. A phenomenon which was extensively observed in the eastern part of the Gibraltar straight. As the parameters of the...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1971 URL: http://archimer.ifremer.fr/doc/1970/publication-4885.pdf
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Observation océanographiques dans le détroit de Gilbraltar pendant la campagne Phygib (Septembre - Octobre 1971) ArchiMer
Cavanie, Alain.
Measurements in the strait of Gibraltar during the last fifteen years have shown the existence of large internal waves propagating at the interface between the upper layer of Atlantic water and the lower layer of Mediterranean water. These waves are generated by the tidal currents running over the sill. The scale of the phenomena are such that non linear variations of the flow in the strait as a fonction of the tidal amplitude can be expected. Specifically, mean Mediterranean outflow over a tidal period should be expected to increase going from neap to spring tides. To study these effects, two currentmeter and hydrological stations were made by the N. O. Le Noroit by the C.0.B.'s physics group in october 1971. The first series of observations made at the...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-5139.pdf
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Observations de fronts internes dans le détroit de Gibraltar pendant la campagne océanographique OTAN 1970 et interprétation des résultats par un modèle mathématique ArchiMer
Cavanie, Alain.
MM. Lacombe, Frassetto and Ziegenbeim's observations, based on different measurement methods, demonstrated the existence of inner fronts and short period oscillations at the interface separating the Atlantic and Mediterranean waters in the eastern part of the Gibraltar straight. These observations show that inner fronts are created by the following mechanism: during the incoming tide, the westward current pushes the Mediterranean waters against the threshold of Gibraltar and, when getting to high tide, when the tide current becomes null, the interface is far from a balanced position, too high to the east, too low to the west of the threshold. The density currents caused by this imbalance creates an inner front of amplitude of more than 50 m which moves...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-4896.pdf
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Observations océanographiques dans le détroit de Gibraltar pendant la campagne Phygib (septembre - octobre 1971) ArchiMer
Cavanie, Alain.
The Gibraltar straight, the only communication area between the Mediterranean Sea and the World Ocean is an area of great interest for oceanographers. It is well known that, in the straight, water flows in two overlaying layers. The Atlantic water upper layer flows into the Mediterranean Sea to compensate for evaporation loss and in the lower layer, the Mediterranean water, more salted and denser, outflows into the Atlantic Ocean. These two opposite flows maintain the level of water of the Mediterranean Sea and its salinity. The measurements made in the straight over the last fifteen years demonstrated the presence of internal waves propagating at the interface of these two water layers and generated by the periodic tide currents at the threshold of the...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1973 URL: http://archimer.ifremer.fr/doc/1973/publication-4972.pdf
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Relation statistique entre hauteur et période des vagues de tempête ArchiMer
Arhan, Michel; Cavanie, Alain; Ezraty, Robert.
A theoretical model of composed probability density of wave height and period is based on the results of Cartwright and Longuet-Higgins on the maximums of a Gaussian random function of order two of narrow spectrum. The concordance with experiment is satisfactory, even for wide spectrums, in the case of recordings of storms in the North Sea.
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1976 URL: http://archimer.ifremer.fr/doc/1976/publication-5190.pdf
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Sédimentation actuelle et récente en mer d'Alboran ArchiMer
Auffret, Gérard-andré; Pastouret, Léo; Cavanie, Alain; Lanoix, F..
Three processes are called to explain the deposition of hemipelagic muds accounting for around 95 % of deposits in the Alboran Sea during the Holocene: general currents, distal part of a turbidite current, or a combination of these two causes a "gravity-assisted bottom current". We will discuss these hypotheses based on the results of the study of superficial sediment samples and the current measurements conducted during the Polymède II cruise (April-May 1972) by the R.S. "Jean Charcot", as well as on recent works about this region's hydrology (Lanoix, 1972).
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1972 URL: http://archimer.ifremer.fr/doc/1972/publication-5127.pdf
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