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| Registros recuperados: 12 | |
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| Greenslade, Diana; Hemer, Mark; Babanin, Alex; Lowe, Ryan; Turner, Ian; Power, Hannah; Young, Ian; Ierodiaconou, Daniel; Hibbert, Greg; Williams, Greg; Aijaz, Saima; Albuquerque, Joao; Allen, Stewart; Banner, Michael; Branson, Paul; Buchan, Steve; Burton, Andrew; Bye, John; Cartwright, Nick; Chabchoub, Amin; Colberg, Frank; Contardo, Stephanie; Dufois, Francois; Earl-spurr, Craig; Farr, David; Goodwin, Ian; Gunson, Jim; Hansen, Jeff; Hanslow, David; Harley, Mitchell; Hetzel, Yasha; Hoeke, Ron; Jones, Nicole; Kinsela, Michael; Liu, Qingxiang; Makarynskyy, Oleg; Marcollo, Hayden; Mazaheri, Said; Mcconochie, Jason; Millar, Grant; Moltmann, Tim; Moodie, Neal; Morim, Joao; Morison, Russel; Orszaghova, Jana; Pattiaratchi, Charitha; Pomeroy, Andrew; Proctor, Roger; Provis, David; Reef, Ruth; Rijnsdorp, Dirk; Rutherford, Martin; Schulz, Eric; Shayer, Jake; Splinter, Kristen; Steinberg, Craig; Strauss, Darrell; Stuart, Greg; Symonds, Graham; Tarbath, Karina; Taylor, Daniel; Taylor, James; Thotagamuwage, Darshani; Toffoli, Alessandro; Valizadeh, Alireza; Van Hazel, Jonathan; Vieira Da Silva, Guilherme; Wandres, Moritz; Whittaker, Colin; Williams, David; Winter, Gundula; Xu, Jiangtao; Zhong, Aihong; Zieger, Stefan. |
| The Australian marine research, industry, and stakeholder community has recently undertaken an extensive collaborative process to identify the highest national priorities for wind-waves research. This was undertaken under the auspices of the Forum for Operational Oceanography Surface Waves Working Group. The main steps in the process were first, soliciting possible research questions from the community via an online survey; second, reviewing the questions at a face-to-face workshop; and third, online ranking of the research questions by individuals. This process resulted in 15 identified priorities, covering research activities and the development of infrastructure. The top five priorities are 1) enhanced and updated nearshore and coastal bathymetry; 2)... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00632/74369/74059.pdf |
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| Dufois, Francois; Lowe, Ryan J.; Rayson, Matthew D.; Branson, Paul M.. |
| Owing to their strong forcing of the ocean surface, tropical cyclones strongly modify the hydrodynamics of Australia's North West Shelf (one of the world's tropical cyclone hotspots), which in turn plays a dominant role in its sediment dynamics. Previous modeling studies have focused on describing the short term sediment dynamics during individual tropical cyclones, but have lacked validation of the responses using field observations. As a consequence, the long term cumulative impact of the tropical cyclones on the residual sediment transport pathways at the shelf scale remains unclear. In this study we apply a sediment transport model over the North West Shelf, validate its performance using an extensive field dataset, and implement a 14 year‐long model... |
| Tipo: Text |
Palavras-chave: ROMS; COAWST; Sediment transport model; Tropical cyclone; Surface waves; Sediment pathways. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00449/56078/57601.pdf |
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| Duffa, Celine; Dufois, Francois; Coudray, Sylvain. |
| As part of its development of post-accident management tools, the French Institute for Radiological Protection and Nuclear Safety is setting up a model to simulate radionuclide dispersion in the Toulon marine area (one of France's main military ports). The model is based on the MARS 3D code developed by IFREMER. It reproduces hydro-sedimentation phenomena in the Bay of Toulon with a horizontal spatial resolution of 100 m and 30 vertical sigma levels and also factors in radioactive decay and dissolved/particulate distribution of the radionuclides studied. With no tide, the major currents in this area are generated by the wind. The model effectively reproduces the resulting hydrodynamic phenomena, which were measured throughout the summer of 2009 in the... |
| Tipo: Text |
Palavras-chave: Bay of Toulon; Radionuclides; Dispersion; MARS. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00053/16465/15998.pdf |
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| Dufois, Francois; Le Hir, Pierre. |
| The capacity of an advection/diffusion model to predict sand transport under varying wave and current conditions is evaluated. The horizontal sand transport rate is computed by vertical integration of the suspended sediment flux. A correction procedure for the near-bed concentration is proposed so that model results are independent of the vertical resolution. The method can thus be implemented in regional models with operational applications. Simulating equilibrium sand transport rates, when erosion and deposition are balanced, requires a new empirical erosion law that involves the non-dimensional excess shear stress and a parameter that depends on the size of the sand grain. Comparison with several datasets and sediment transport formulae demonstrated the... |
| Tipo: Text |
Palavras-chave: Sand; 1DV model; Erosion rate; Suspended sediment transport. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00276/38763/37304.pdf |
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| Dufois, Francois; Hardman-mountford, Nick J.; Greenwood, Jim; Richardson, Anthony J.; Feng, Ming; Herbette, Steven; Matear, Richard. |
| A unique feature of the subtropical South Indian Ocean is the existence of anticyclonic eddies that have higher chlorophyll concentrations than cyclonic eddies. Off Western Australia, this anomalous behavior is related to the seeding of anticyclonic eddies with shelf water enriched in phytoplankton biomass and nutrients. Further off-shore, two mechanisms have been suggested to explain the eddy/chlorophyll relationship: (i) eddies originating from the Australian coast maintain their chlorophyll anomaly while propagating westward; and (ii) eddy-induced Ekman upwelling (downwelling) enhances (dampens) nutrient supply in anticyclonic (cyclonic) eddies. Here we describe the relationship between eddies and surface chlorophyll within the South Indian Ocean, and... |
| Tipo: Text |
Palavras-chave: Eddies; Chlorophyll; Self-organizing map; Convective mixing; Eddy-induced Ekman pumping. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34464/32862.pdf |
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| Dufois, Francois; Verney, Romaric; Le Hir, Pierre; Dumas, Franck; Charmasson, Sabine. |
| In this study a three-dimensional sediment transport model was developed. The model accounts for both current and wave forcing on the sediment and was implemented over the Gulf of Lions. A two-way nesting technique was used to focus on the Rhone River prodelta which is considered as a sink for riverine sediment. In addition, to understand the resuspension of trapped sediment over the Rhone prodelta, an in situ experiment, called SCOPE, was conducted during the winter 2007/2008. The experiment consisted of measuring hydro-sedimentary parameters using a mooring station comprising a current profiler (ADCP) and an altimeter (acoustic transducer) located in the eastern part of the Rhone prodelta. The three-dimensional transport model was validated using these... |
| Tipo: Text |
Palavras-chave: Sediment transport; Gulf of Lions; Rhone prodelta; 3D modelling; ADCP; ALTUS. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00165/27584/25743.pdf |
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| Marion, C.; Dufois, Francois; Arnaud, Mireille; Vella, C.. |
| The environment is impacted by natural and anthropogenic disturbances that occur at different spatial and temporal scales, and that lead to major changes and even disequilibria when exceeding the resiliency capacities of the ecosystem. With an annual mean flow of 1700 m(3) s(-1), the Rhone River is the largest of the western Mediterranean basin. Its annual solid discharges vary between 2 and 20 Mt, with flood events responsible for more than 70% of these amounts. In the marine coastal area, close to the mouth, both flocculation and aggregation lead to the formation of fine-grained deposits, i.e. the prodelta. This area is characterized by sediment accumulation rates up to 20-50 cm yr(-1) and high accumulations of particle reactive contaminants such as... |
| Tipo: Text |
Palavras-chave: Sediment dynamics; Floods; Hydrodynamics; Radiotracers; Rhone River prodelta. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00006/11695/8479.pdf |
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| Bassetti, Maria-angela; Jouet, Gwenael; Dufois, Francois; Berne, Serge; Rabineau, Marina; Taviani, M. |
| The outer continental shelf of the Gulf of Lions is covered by thick, mainly regressive, sand deposits. A combination of seismic, sedimentological and geochronological methods allows us to demonstrate that a veneer of transgressive sand bodies, few m to less than 1 m thick, reworks these deposits. They take the form of sand ridges and transverse dunes that formed at different periods. In fact, the low-gradient outer shelf of the Gulf of Lions displays a complete record of deglacial history, including not only transgressive deposits that formed during sea-level rise, but also bedfonns that still evolve under episodic high-energy events that occur under more highstand conditions. Core lithology, C-14 dates and regional sea-level curve suggest that the... |
| Tipo: Text |
Palavras-chave: Gulf of Lions; Sand transport; Deglacial transgression; Outer shelf; Sand ridges. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2321.pdf |
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| Veitch, Jennifer; Hermes, Juliet; Lamont, Tarron; Penven, Pierrick; Dufois, Francois. |
| The dynamics and seasonal variability of jet currents on the southern Benguela shelf-edge are investigated using a climatologically forced ROMS model. The jet is primarily forced by the intense horizontal gradients that exist across the southern Benguela shelf. These gradients are set up by nearshore cooling via the strongly seasonal upwelling regime and variable offshore warming by the advection of Agulhas waters. While the nearshore cooling is prevalent only during the spring and summer upwelling season, the offshore warming exists throughout the year. As a result intensified geostrophically adjusted currents exist throughout the year, particularly off the Cape Peninsula and Cape Columbine. However, the distinct shelf-edge jet features are most intense... |
| Tipo: Text |
Palavras-chave: Southern Benguela; Shelf-edge jet; Numerical model. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00403/51401/51976.pdf |
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| Dufois, Francois; Garreau, Pierre; Le Hir, Pierre; Forget, P. |
| Simulations of both currents and waves were performed throughout the year 2001 to assess the relative contribution of each to their overall erosive potential on the Gulf of Lions shelf. Statistical analysis of bottom shear stress (BSS) was compared to sediment grain-size distribution on the bottom. The hydrodynamic features of the bottom layer coincide with the distribution of surficial sediments, and three areas with different hydro-sedimentary characteristics were revealed. (i) The sandy inner shelf ( < 30 m) area is a high-energy-wave dominated area but may be subjected to intense current-induced BSS during on-shore winds along the coast and during continental winds mainly in the up-welling cells. (ii) The middle shelf (30-100 m) is a low-energy... |
| Tipo: Text |
Palavras-chave: Gulf of Lions; 3D modelling; Bottom shear stress; Sediment transport. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6305.pdf |
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| Registros recuperados: 12 | |
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