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The Euler-Poincare Equations in Geophysical Fluid Dynamics

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arxiv chao-dyn/9903035 v1 pith:XUPJ64DB submitted 1999-03-25 chao-dyn nlin.CD

The Euler-Poincare Equations in Geophysical Fluid Dynamics

classification chao-dyn nlin.CD
keywords equationslagrangiananalogderiveddynamicseuler-poincarfluidgeophysical
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Recent theoretical work has developed the Hamilton's-principle analog of Lie-Poisson Hamiltonian systems defined on semidirect products. The main theoretical results are twofold: (1) Euler-Poincar\'e equations (the Lagrangian analog of Lie-Poisson Hamiltonian equations) are derived for a parameter dependent Lagrangian from a general variational principle of Lagrange d'Alembert type in which variations are constrained; (2) an abstract Kelvin-Noether theorem is derived for such systems. By imposing suitable constraints on the variations and by using invariance properties of the Lagrangian, as one does for the Euler equations for the rigid body and ideal fluids, we cast several standard Eulerian models of geophysical fluid dynamics (GFD) at various levels of approximation into Euler-Poincar\'{e} form and discuss their corresponding Kelvin-Noether theorems and potential vorticity conservation laws.

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    A path integral on the Hilbert space of a Lie group is built by decompactifying to the Lie algebra and summing over winding sectors in maximal tori, yielding two-loop heat-kernel coefficients for Euler-Arnold systems.