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In situ salinity measurements in seawater with a fibre-optic probe ArchiMer
Diaz Herrera, N; Esteban, O; Navarrete, M; Le Haitre, Michel; Gonzalez Cano, A.
We have successfully proved the feasibility of an optical salinity meter for marine applications in a two week measurement campaign, carried out for the realization of in situ salinity measurements in seawater. An optical instrument (optode), in which the main element is a fibre-optic refractive-index sensor based on surface plasmon resonance (SPR), has been developed for that purpose, and has been especially designed to be able to operate in realistic conditions. The performance of the optode has been evaluated on an oceanographic ship in the Baltic Sea, close to the Vistula estuarine area. The obtained results ( in different tests, such as depth-profiling, towing and stationary measurements) show good correlation with the data provided by a commercial...
Tipo: Text Palavras-chave: Resonance; Surface plasmon; Salinity measurement; Fibre optics sensors.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2124.pdf
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Propagation 3D d'ondes inertielles au sein d'un champ turbulent mésoéchelle ArchiMer
Danioux, Eric.
A current problem in physical oceanography is to identify the sources of energy at the origin of the abyssal mixing associated with thermohaline circulation. An important source is the inertial waves generated by wind. However, the mechanisms driving this energy from the surface to the deep mixing remain poorly understood. We study here the tridimensional propagation of inertial waves in a fully turbulent mesoscale eddy field with a primitive equations numerical model. After presenting a review of works to date, we describe various methods for extracting the inertial signal. The 3D propagation of inertial waves is then described and rationalized. In particular, two dramatic maxima of the vertical velocity have been found around 100 m and 1700 m. The deep...
Tipo: Text Palavras-chave: Potential vorticity; Diapycnal mixing; Thermohaline circulation; Resonance; Inertial waves; Vorticité potentielle; Mélange diapycnal; Circulation thermohaline; Résonance; Ondes inertielles.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/these-4933.pdf
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Sea-level rise impacts on the tides of the European Shelf ArchiMer
Idier, Deborah; Paris, Francois; Le Cozannet, Goneri; Boulahya, Faiza; Dumas, Franck.
Sea-level rise (SLR) can modify not only total water levels, but also tidal dynamics. Several studies have investigated the effects of SLR on the tides of the western European continental shelf (mainly the M2 component). We further investigate this issue using a modelling-based approach, considering uniform SLR scenarios from −0.25 m to +10 m above present-day sea level. Assuming that coastal defenses are constructed along present-day shorelines, the patterns of change in high tide levels (annual maximum water level) are spatially similar, regardless of the magnitude of sea-level rise (i.e., the sign of the change remains the same, regardless of the SLR scenario) over most of the area (70%). Notable increases in high tide levels occur especially in the...
Tipo: Text Palavras-chave: Tide; Sea-level rise; Tidal component; Climate change; European Shelf; Resonance.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00367/47859/47842.pdf
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Structural static and modal frequency simulations in a coffee harvester’s chassis AGRIAMBI
Silva,Evandro P. da; Silva,Fábio M. da; Andrade,Ednilton T. de; Magalhães,Ricardo R..
ABSTRACT Coffee harvesters are subject to stresses and vibrations in their structure, originating from engines and harvesting system. These structures must be designed to avoid rupturing of the components due to fragility of the materials, inadequate geometries, or the phenomenon of resonance, which increases the displacements/deformations of the components. In this scenario, the main objective of this study is to analyse the results of stresses and displacements from two static simulations and to present results of natural vibration frequencies from two modal simulations in a self-propelled coffee harvester. For this purpose, 20 modal shapes were generated, considering coffee harvester reservoir as empty and full. The simulations were carried out using...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Design; Vibration; Resonance; Stresses; Displacements.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000700511
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