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| Registros recuperados: 64 | |
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| Leckler, Fabien; Ardhuin, Fabrice; Peureux, Charles; Benetazzo, Alvise; Bergamasco, Filippo; Dulov, Vladimir. |
| The energy level and its directional distribution are key observations for understanding the energy balance in the wind-wave spectrum between wind-wave generation, nonlinear interactions, and dissipation. Here, properties of gravity waves are investigated from a fixed platform in the Black Sea, equipped with a stereo video system that resolves waves with frequency f up to 1.4 Hz and wavelengths from 0.6 to 11 m. One representative record is analyzed, corresponding to young wind waves with a peak frequency fp = 0.33 Hz and a wind speed of 13 m s−1. These measurements allow for a separation of the linear waves from the bound second-order harmonics. These harmonics are negligible for frequencies f up to 3 times fp but account for most of the energy at higher... |
| Tipo: Text |
Palavras-chave: Circulation; Dynamics; Waves; Oceanic; Observational techniques and algorithms; Remote sensing. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00284/39524/38017.pdf |
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| Broche, P; Devenon, Jean-luc; Forget, P; De Maistre, Jc; Naudin, Jj; Cauwet, G. |
| The complicated dynamic processes occurring when fluvial waters mix with marine waters control the nature and the fluxes of materials exported tay rivers to the sea. Understanding these processes is of primary importance in evaluating budgets. In wide-open estuarine situations these processes take place under the influence of an intense turbulence induced by tides. Conversely, the Rhone waters spread into the Mediterranean Sea in the form of an easily distinguishable buoyant plume often extending far offshore from the mouth of the river. The aim of this study is to describe the dynamic and hydrological fields on the basis of eulerian VHF radar mapping of surface currents coupled with lagrangian in situ physical or geochemical measurements. This paper... |
| Tipo: Text |
Palavras-chave: Panache fluvial; Radar VHF; Rhône; Dynamique; River plume; VHF radar; Rhone; Dynamics. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00325/43636/43229.pdf |
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| Ollitrault, Michel; Colin De Verdiere, Alain. |
| The mean ocean circulation near 1000-m depth is estimated with 100-km resolution from the Argo float displacements collected before 1 January 2010. After a thorough validation, the 400 000 or so displacements found in the 950–1150 dbar layer and with parking times between 4 and 17 days allow the currents to be mapped at intermediate depths with unprecedented details. The Antarctic Circumpolar Current (ACC) is the most prominent feature, but western boundary currents (and their recirculations) and alternating zonal jets in the tropical Atlantic and Pacific are also well defined. Eddy kinetic energy (EKE) gives the mesoscale variability (on the order of 10 cm2 s−2 in the interior), which is compared to the surface geostrophic altimetric EKE showing e-folding... |
| Tipo: Text |
Palavras-chave: Circulation; Dynamics; Currents; Dynamics; Large-scale motions; Ocean circulation. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00174/28512/26877.pdf |
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| Uaissone, A.J.R.. |
| The work refers to variations of the mean sea level (MSL) in Piraquara (RJ) due to mesoscale atmospheric disturbances in the South and Southeast Brazil oceanic area. The sea level data were submitted to a verification and consistence process, and then they were validated with the help of predicted levels by the software Pacmaré (FRANCO, 1992). For the pressure and wind velocities, the NCEP re-analysis data was used. Thompson's low pass optimizable filter was used to remove high frequencies in the data. Differently to the habitual use of quarters of year in climatologic studies, in this work partitions of the year centered in solstice and equinox were considered. About the results of the statistical analysis in the time domain, it was seen that MSL... |
| Tipo: Theses and Dissertations |
Palavras-chave: Sea level; Atmospheric disturbances; Dynamics. |
| Ano: 2004 |
URL: http://hdl.handle.net/1834/910 |
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| Chkioua, A.; BRAHIM, M.. |
| Les résultats des analyses granulométriques et minéralogiques des sédiments de surface du golfe de Tunis, prélevés à différentes profondeurs entre Sidi El Mekki et le Cap Bon, ont permis d’identifier l’origine de ces sédiments et de préciser les modes de transport et de dépôt. L’étude granulométrique a montré que les matériaux détritiques dans le golfe de Tunis sont d’origine continentale. L’étude minéralogique a permit de mettre en évidence une nette relation entre le stock sédimentaire récent du golfe de Tunis et les formations géologiques bordières. La répartition des sédiments grossiers et fins dans le golfe de Tunis est contrôlée par les courants généraux de la méditerranée. Le passage des courants généraux dans le golfe conditionne la présence... |
| Tipo: Journal Contribution |
Palavras-chave: Dynamics; Grain size; Granulometry; Mineralogy; Sediment analysis; Sediment distribution. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/4254 |
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| Torres,G; Andrade,C. |
| En Bahía Aeolián es un puerto que esta sometido al tráfico marítimo principalmente turístico, donde se efectúa el centro de distribución comercial de combustibles para las mismas. En el agua de lastre y casco de los barcos se transportan organismos no deseados (virus, bacterias, algas que causan plagas o enfermedades), que se han propagado a nivel mundial, afectando algunos ecosistemas naturales (Waite et al., 2003), generando grandes problemas que siguen afectando tanto a países desarrollados como en vías de desarrollo. Existen escasas investigaciones del plancton en la Bahía Aeolián, el objetivo del presente estudio fue caracterizar una Base de datos de la biodiversidad el fitoplancton y zooplancton del ecosistema marino costero del Puerto Baltra y... |
| Tipo: Preprint |
Palavras-chave: Plankton; Ocean tides; Dynamics. |
| Ano: 2014 |
URL: http://hdl.handle.net/1834/5455 |
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| Jaramillo-González, J.; Acosta, A.. |
| Los arrecifes coralinos del mundo han sufrido un declive durante las pasadas tres décadas. Estos cambios se han evaluado en arrecifes en franja; sin embargo, se desconoce si los tensores causantes de dichos cambios afectan la dinámica de una comunidad coralina en los primeros estados de la sucesión antes del desarrollo de un arrecife. Para resolver este interrogante, se monitoreó durante 2004, 2005 y 2006 una comuniddad coralina aislada en San Andrés. Se compararon temporalmente la abundancia, cobertura y mortalidad parcial sufrida por la comjnidad coralina y sus poblaciones de coral dominantes. La comunidad coralina no presentó variación estadística en riqueza, abundancia, cobertura, ni en área de mortalidad parcial. Sin embargo, esta comunidad si varió... |
| Tipo: Journal Contribution |
Palavras-chave: Coral; Dynamics; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/3605 |
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| Tuffi Santos,L.D.; Cardoso Filho,O.; Santos Júnior,A.; Sant'Anna-Santos,B.F.; Felix,R.C.; Leite,F.P.. |
| The objective of this work was to analyze the floristic variation and phytosociological structure of weeds as influenced by relief and time of year in eucalyptus plantations in Santana do Paraíso and Guanhães - MG. The total area sampled for each locality was approximately 10 ± 3 hectares, comprising three types of relief: lowland, slope, and upper area. In each type of relief, 10 plots of 1 m² were sampled, corresponding to 30 plots per locality, where they were randomly allocated in a zigzag. The taxonomic identification was performed in four assessments, corresponding to the months of November and March, comprising two ratings each season, always at the same points, and geo-referenced using the Global Positioning System (GPS). A total of 3,893... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Dynamics; Phytosociology; Ecological adaptation. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000300001 |
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| Carvalho,S.J.P.; Soares,D.J.; Lopez-Ovejero,R.F.; Christoffoleti,P.J.. |
| Two experiments were carried out to evaluate soil persistence of chlorimuron-ethyl and metsulfuron-methyl and phytotoxicity to corn seeded as a succeeding crop. One experiment was conducted with chlorimuron-ethyl applied at 20 g ha-1, and one with metsulfuron-methyl applied at 3.96 g ha-1. Treatments were arranged in a factorial design with two types of soil (sandy and clay), three irrigation regimes (daily, weekly and no irrigation) and four application timings (90, 60 and 30 days before corn seeding, as well as untreated plots). Soil persistence of the herbicides was influenced by water availability, molecule water solubility (leaching potential) and application timings prior to corn seeding. In sandy soil, with adequate water availability, leaching... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carryover; Leaching; Microbial degradation; Dynamics. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200331 |
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| Registros recuperados: 64 | |
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