Fundamentals of Geophysical Hydrodynamics pp 13-21 | Cite as

# Potential Vorticity and the Conservation Laws of Energy and Momentum for a Stratified Incompressible Fluid

Chapter

## Abstract

Note, however, an important feature of the motion of a stratified fluid: it is fibered into surfaces of constant density (isopycnic or iso-density surfaces) and remains such in the process of evolution: every fluid particle belonging to such a surface at the initial moments remains on the same surface due to the Lagrangian invariance of density. (This is why stratified fluid is also often called fibered.) In turn, the motion along any iso-density surface is a Lagrangian invariant (

*ρ*(*t*,**x**)=*ρ*_{0}=const is the motion of a homogeneous incompressible fluid, for which the Kelvin theorem holds. In particular,$$ K_{0} \doteq \oint\limits _{C_{0}} \mathbf{u} \delta\mathbf{l}= \boldsymbol {\Omega} d\boldsymbol {\sigma}_{0} $$

(2.1)

*dK*_{0}/*dt*=0), where*C*_{0}is an infinitesimal closed contour on the iso-density surface, while*d***σ**_{0}is an element of this surface bounded by the contour*C*_{0}.## Keywords

Incompressible Fluid Potential Vorticity Fluid Particle Fluid Domain Stream Line
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

## References

- N.E. Kochin, I.A. Kibel, and N.V. Roze,
*Theoretical Hydromechanics*, GITTL, Moscow, 1955. Google Scholar - L.D. Landau and E.M. Lifschitz,
*Fluid Mechanics*, Nauka, GRFML, Moscow, 1986. (In English: 2nd edn., 1987, Reed Educ. Prof. Publ.). Google Scholar - D.J. Tritton,
*Physical Fluid Dynamics*, Oxford University Press, Oxford, 1988. Google Scholar

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