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By Gerhard H Jirka; Wim S J Uijttewaal

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We conclude in part 6.  Sketch of the experimental setup.  Vertical cross section of the current along the wall. provide large Reynolds and very small Rossby numbers and allow then relevant comparisons with oceanic flows.  However, the number of meanders and their amplitude differs a little because of initial perturbations and small residual currents. 5°C).  It is the ratio of the Rossby deformation radius rd over the current width L0. – the depth ratio: h0/H. – the aspect ratio: h0/L0 – the Froude number: – the Ekman number: The Ekman number quantifies the influence of viscous friction which tends to stabilize the current.

Flow around an elliptic fixed point.  Here, we shall develop only the local point of view since it gives insights on the instability mechanism and on the effect of stratification and rotation.  For elliptic deformations the resonance condition reads: ωc=ζ/2. (4) According to the dispersion relation (3) such a wave does not exist when either: ζ/2max(N, |ζ+2Ω|). (5) The vortex is then stable with respect to elliptic instability if (Miyazaki, 1993): F>2 and −2−2/3).

11, 57. , 34, 177.  93, 148. West), 79. , 73, 721–733.  Fluids A, 2, 76.  This interpretation is supported by measurements of the growth rates and phase difference between both layers, compared with the simple two­layer model of baroclinic instability.  Other boundary currents are generated by wind stress, like in the Gulf of Alaska, and are associated with upwelling effects.  They play therefore a major role in the distribution of the biogeochemical components and their transfer between different basins.

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