Splitting of Stratified Flows over Obstacles
V.Yu. Lyapidevsky1, O.A. Zuev2, N.I. Makarenko1, E.G. Morozov2, D.I. Frey2
1Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
2P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
Keywords: stratified fluid, flow over obstacles, splitting
Abstract
Mathematical models in the long-wave approximation for a three-layer fluid, taking into account mixing and entrainment at the layer interfaces, are considered. These nonlinear models are used to describe changes in the characteristics of heterogeneous flows when passing over localized seabed elevations. Comparison of numerical results with field measurements shows that the models adequately reproduce the structure of shelf and deep-water currents, in which flow splitting occurs with subsequent thickening of the passive intermediate layer and the formation of an intense downslope jet downstream of the obstacle.
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