Whitham's equations for modulated roll-waves in shallow flows

Details Whitham's equations for modulated roll-waves in shallow flows Whitham's equations for modulated roll-waves in shallow flows

2010-11-10

arxiv.org/abs/1011.2296v1

Mathematics

Analysis of PDEs

Scientific paper

This paper is concerned with the detailed behaviour of roll-waves undergoing a low-frequency perturbation. We rst derive the so-called Whitham's averaged modulation equations and relate the well-posedness of this set of equations to the spectral stability problem in the small Floquet-number limit. We then fully validate such a system and in particular, we are able to construct solutions to the shallow water equations in the neighbourhood of modulated roll-waves proles that exist for asymptotically large time.

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