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Ocean–atmosphere–wave characterisation of a wind jet (Ebro shelf, NW Mediterranean Sea)
Grifoll Colls, Manel; Navarro, Jorge; Pallarès López, Elena; Ràfols Bundó, Laura; Espino Infantes, Manuel; Palomares, Ana
Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental; Universitat Politècnica de Catalunya. CENIT - Recerca i innovació en Transport, Mobilitat i Logística; Universitat Politècnica de Catalunya. LIM/UPC - Laboratori d'Enginyeria Marítima
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.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria civil::Geologia::Hidrologia
Ebro River (Spain)
Ebre (Riu)
University of Thechnology and Agriculture Nicholas Copernicus University

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