Convectively induced shear instability in large amplitude internal solitary waves

M. Carr, D. Fructus, J. Grue, A. Jensen, P.A. Davies

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    Abstract

    Laboratory study has been carried out to investigate the instability of an internal solitary wave of depression in a shallow stratified fluid system. The experimental campaign has been supported by theoretical computations and has focused on a two layered stratification consisting of a homogeneous dense layer below a linearly stratified top layer. The initial background stratification has been varied and it is found that the onset and intensity of breaking are affected dramatically by changes in the background stratification. Manifestations of a combination of shear and convective instability are seen on the leading face of the wave. It is shown that there is an interplay between the two instability types and convective instability induces shear by enhancing isopycnal compression. Variation in the upper boundary condition is also found to have an effect on stability. In particular, the implications for convective instability are shown to be profound and a dramatic increase in wave amplitude is seen for a fixed (as opposed to free) upper boundary condition. c 2008 American Institute of Physics. [DOI: 10.1063/1.3030947]

    Original languageEnglish
    Article number126601
    Pages (from-to)-
    Number of pages13
    JournalPhysics of Fluids
    Volume20
    Issue number12
    DOIs
    Publication statusPublished - Dec 2008

    Keywords

    • TRAPPED CORES
    • FLOWS
    • GENERATION
    • BREAKING

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