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Journal Articles Ocean Modelling Year : 2022

Intruding gravity currents and their recirculation in a rotating frame: Numerical results

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Abstract

Using a set of direct numerical simulations (DNS) we investigate the circulation of a buoyancy driven experiment in a circular rotating tank. The initial density structure is a two-layer stable-stratification. The water is densified at 32 points at the upslope side of a circular incline and flows downward as a gravity current before it intrudes to the interior along the interface between the two layers. The water above recirculates to the densification points. When the buoyancy production is lower than the maximal Ekman transport, the gravity current proceeds in the laminar Ekman layer. In the opposite case, the water cascades down the incline in a no-stationary dynamics, turbulent transport becomes important and the boundary layer is thickened. The thermal wind relation applied to the tangential velocity averaged-along-the-slope predicts the density structure averaged-along-the-slope in the domain.
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Dates and versions

hal-03747407 , version 1 (13-10-2022)

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Achim Wirth, Maria Eletta Negretti. Intruding gravity currents and their recirculation in a rotating frame: Numerical results. Ocean Modelling, 2022, 173, pp.101994. ⟨10.1016/j.ocemod.2022.101994⟩. ⟨hal-03747407⟩

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