Existence of permanent and breaking waves for a shallow water equation: a geometric approach
Annales de l'Institut Fourier, Volume 50 (2000) no. 2, pp. 321-362.

The existence of global solutions and the phenomenon of blow-up of a solution in finite time for a recently derived shallow water equation are studied. We prove that the only way a classical solution could blow-up is as a breaking wave for which we determine the exact blow-up rate and, in some cases, the blow-up set. Using the correspondence between the shallow water equation and the geodesic flow on the manifold of diffeomorphisms of the line endowed with a weak Riemannian structure, we give sufficient conditions for the initial profile to develop into a global classical solution or into a breaking wave. With respect to the geometric properties of the diffeomorphism group, we prove that the metric spray is smooth infering that, locally, two points can be joined by a unique geodesic. The qualitative analysis of the shallow water equation is used to to exhibit breakdown of the geodesic flow despite the existence of geodesics that can be continued indefinitely in time.

On obtient des théorèmes d’existence de solutions globales en temps et des résultats sur la formation de singularités pour une équation qui modélise le phénomène des ondes de surface en eau peu profonde. La solution peut exploser uniquement sous la forme d’un déferlement. En utilisant le fait que cette équation d’ondes décrit le flot géodésique du groupe des difféomorphismes de la droite vérifiant certaines conditions asymptotiques à l’infini, muni d’une structure de variété riemannienne, on donne des conditions suffisantes sur la donnée initiale pour que la solution soit globale en temps ou bien qui impliquent un déferlement au bout d’un temps fini. Ces résultats se traduisent en terme de propriétés des géodésiques du groupe des difféomorphismes.

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Constantin, Adrian. Existence of permanent and breaking waves for a shallow water equation: a geometric approach. Annales de l'Institut Fourier, Volume 50 (2000) no. 2, pp. 321-362. doi : 10.5802/aif.1757. http://www.numdam.org/articles/10.5802/aif.1757/

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