Archive for Rational Mechanics and Analysis

, Volume 231, Issue 3, pp 1853–1915 | Cite as

Imperfect Bifurcation for the Quasi-Geostrophic Shallow-Water Equations

  • David Gerard Dritschel
  • Taoufik HmidiEmail author
  • Coralie Renault


We study analytical and numerical aspects of the bifurcation diagram of simply connected rotating vortex patch equilibria for the quasi-geostrophic shallow-water (QGSW) equations. The QGSW equations are a generalisation of the Euler equations and contain an additional parameter, the Rossby deformation length \({\varepsilon^{-1}}\), which enters into the relation between the stream function and (potential) vorticity. The Euler equations are recovered in the limit \({\varepsilon \rightarrow 0}\). We prove, close to circular (Rankine) vortices, the persistence of the bifurcation diagram for arbitrary Rossby deformation length. However we show that the two-fold branch, corresponding to Kirchhoff ellipses for the Euler equations, is never connected even for small values \({\varepsilon}\), and indeed is split into a countable set of disjoint connected branches. Accurate numerical calculations of the global structure of the bifurcation diagram and of the limiting equilibrium states are also presented to complement the mathematical analysis.


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DGD received support for this research from the UK Engineering and Physical Sciences Research Council (grant number EP/H001794/1). TH is partially supported by the the ANR project Dyficolti ANR-13-BS01-0003- 01.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • David Gerard Dritschel
    • 1
  • Taoufik Hmidi
    • 2
    Email author
  • Coralie Renault
    • 2
  1. 1.Mathematical InstituteUniversity of St AndrewsSt AndrewsUK
  2. 2.CNRS, IRMAR - UMR 6625, Univ RennesRennesFrance

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