Modelling of the Ebro River plume. Validation with field observations

Mestres, Marc; Sierra, Joan Pau; Sánchez‐Arcilla, Agustín; Río, J. González del; Wolf, Thomas; Rodríguez, Andrés; Ouillon, Sylvain

doi:10.3989/scimar.2003.67n4379

Cited by 40 publications

(22 citation statements)

References 49 publications

(52 reference statements)

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“…Furthermore, the regional response to wind jets is not clear due to the complex bathymetry and the spatial variability of the wind jet. Durand et al (2002) and Mestres et al (2003) showed that the effects of the salinity river plume are important only near the river mouth (of the order of 10 km offshore from the river mouth).…”

Section: Study Area and Observationsmentioning

confidence: 99%

“…Under severe storm conditions (hurricanes and cyclones), this parameter influences the spatial and temporal evolution of the meteo-oceanographic variables. Other recent examples that use a fully numerical model to investigate the air-sea interaction and its effect on oceanographic processes are found in Nelson and He (2012) and Drews (2013).…”

Section: Introductionmentioning

confidence: 99%

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Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll

Navarro

Pallarés

et al. 2016

Nonlin. Processes Geophys.

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Abstract. In this contribution the wind jet dynamics in the northern margin of the Ebro River shelf (NW Mediterranean Sea) are investigated using coupled numerical models. The study area is characterised by persistent and energetic offshore winds during autumn and winter. During these seasons, a seaward wind jet usually develops in a ∼ 50 km wide band offshore. The COAWST (Coupled Ocean-Atmosphere-Wave-Sediment Transport) modelling system was implemented in the region with a set of downscaling meshes to obtain high-resolution meteooceanographic outputs. Wind, waves and water currents were compared with in situ observations and remote-sensingderived products with an acceptable level of agreement. Focused on an intense offshore wind event, the modelled wind jet appears in a limited area offshore with strong spatial variability. The wave pattern during the wind jet is characterised by the development of bimodal directional spectra, and the ocean circulation tends to present well-defined twolayer flow in the shallower region (i.e. inner shelf). The outer shelf tends to be dominated by mesoscale dynamics such as the slope current. Due to the limited fetch length, ocean surface roughness considering sea state (wave-atmosphere coupling) modifies to a small extent the wind and significant wave height under severe cross-shelf wind events. However, the coupling effect in the wind resource assessment may be relevant due to the cubic relation between the wind intensity and power.

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Section: Study Area and Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Grifoll

Navarro

Pallarés

et al. 2016

Nonlin. Processes Geophys.

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“…The presence of a strong pycnocline during summer, between 10 150 and 20 m depth in the Ebro shelf [Jordà, 2005;Bastida et al, 2012], decouples the processes between surface and deep layers [Jordà et al, 2005;Grifoll et al, 152 2013]. Additionally, Durand et al [2002] and Mestres et al [2003] showed that the effects of the river plume are important only near the river mouth (order of 154 10 km offshore from the river mouth). From their observations and numerical results, the NES is relatively far from the influence of the river.…”

mentioning

confidence: 99%

Shelf response to intense offshore wind

2015

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Cross and along‐shelf winds drive cross‐shelf transport that promotes the exchange of tracers and nutrients to the open sea. The shelf response to cross‐shelf winds is studied in the north shelf of the Ebro Delta (Mediterranean Sea), where those winds are prevalent and intense. Offshore winds in the region exhibit strong intensities (wind stress larger than 0.8 Pa) during winter and fall. The monthly average flow observed in a 1 year current meter record at 43.5 m was polarized following the isobaths with the along‐shelf variability being larger than the cross‐shelf. Prevalent southwestward along‐shelf flow was induced by the three‐dimensional regional response to cross‐shelf winds and the coastal constraint. Seaward near‐surface velocities occurred predominantly during offshore wind events. During intense wind periods, the surface cross‐shelf water transport exceeded the net along‐shelf transport. During typically stratified seasons, the intense cross‐shelf winds resulted in a well‐defined two‐layer flow and were more effective at driving offshore transport than during unstratified conditions. While transfer coefficients between wind and currents were generally around 1%, higher cross‐shelf transfer coefficients were observed in the near‐inertial band. The regional extent of the resulting surface cold water during energetic cross‐shelf winds events was concentrated around the region of the wind jet. Cross‐shelf transport due to along‐shelf winds was only effective during northeast wind events. During along‐shelf wind conditions, the transport was estimated to be between 10 and 50% of the theoretical Ekman transport.

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“…Este modelo ha sido aplicado con éxito a varios escenarios (Mestres et al 2003(Mestres et al , 2010.…”

Section: Modelos Numéricosunclassified

Modeling the benthic loading of particulate wastes from a gilthead seabream (Sparus aurata) farm during a complete rearing cycle

2016

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INTRODUCCIÓNLa interacción entre la acuicultura y calidad de agua es un tema ampliamente conocido. Mientras que el volumen y la calidad de la cosecha, e incluso la viabilidad de la granja, dependen de la calidad del agua en la que se encuentra ubicada, las actividades de cultivo de peces son también una fuente potencial de deterioro de la calidad del agua, debido al aporte de diferentes tipos de materias y sustancias al medio acuático. Éstas pueden incluir estructuras plásticas y metálicas, alimento no consumido, productos metabólicos, productos químicos, microorganismos, parásitos, o animales ABSTRACT.The relationship between aquaculture activities and water quality plays an important role in determining the volume and quality of production as well as the impact of aquaculture on the aquatic environment. The natural assimilation capacity of a waterbody is often insufficient to cope with the continuous input of wastes from fish farms. Their impact depends not only on the waste itself, but also on other factors such as the local hydrodynamics at the farm site or the cultured species' feeding pattern. We combine a hydrodynamic model with a transport code to simulate the deposition of fecal pellets and uneaten feed from a gilthead seabream farm in the western Mediterranean Sea. The simulation spans a full 17-month rearing cycle and considers the natural variations in the feed demand of the fish during this period. The results indicated that the maximum benthic concentrations of organic matter and nutrients were found within a 100-500 m distance from the cages, depending on the type of particulate waste and on the local current characteristics. The combination of a long simulation period and realistic hydrodynamic patterns highlights the importance of considering long-term current variability when assessing the environmental impact of fish farms, and stresses the limitations of current simplistic assessment practices.

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Modelling of the Ebro River plume. Validation with field observations

Cited by 40 publications

References 49 publications

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)

Shelf response to intense offshore wind

Modeling the benthic loading of particulate wastes from a gilthead seabream (Sparus aurata) farm during a complete rearing cycle

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