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- W1612417119 abstract "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-Poincare 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-Poincare form and discuss their corresponding Kelvin-Noether theorems and potentialvorticity conservation laws. The various levels of GFD approximation are related by substituting a sequence of velocity decompositions and asymptotic expansions into Hamilton's principle for the Euler equations of a rotatingstratified ideal incompressible fluid. We emphasize that the shared properties of this sequence of approximate ideal GFD models follow directly from their Euler-Poincare formulations. New modifications of the Euler-Boussinesqequations and primitive equations are also proposed in which nonlinear dispersion adaptively filters high wavenumbers and thereby enhances stability and regularity without compromising either low wavenumber behavior or geophysical balances." @default.
- W1612417119 created "2016-06-24" @default.
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- W1612417119 date "2002-01-01" @default.
- W1612417119 modified "2023-09-23" @default.
- W1612417119 title "The Euler-Poincaré Equations in Geophysical Fluid Dynamics" @default.
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