A Hamiltonian weak-wave model for shallow-water flow
Abstract
A reduced dynamical model is derived which describes the interaction of weak inertia-gravity waves with nonlinear vortical motion in the context of rotating shallow-water flow. The formal scaling assumptions are (i) that there is a separation in timescales between the vortical motion and the inertia-gravity waves, and (ii) that the divergence is weak compared to the vorticity. The model is Hamiltonian, and possesses conservation laws analogous to those in the shallow-water equations. Unlike the shallow-water equations, the energy invariant is quadratic. Nonlinear stability theorems are derived for this system, and its linear eigenvalue properties are investigated in the context of some simple basic flows.
Cite
@article{arxiv.chao-dyn/9605010,
title = {A Hamiltonian weak-wave model for shallow-water flow},
author = {Caroline Nore and Theodore G. Shepherd},
journal= {arXiv preprint arXiv:chao-dyn/9605010},
year = {2009}
}
Comments
plain TeX To appear in: Proceedings of The Royal Society of London