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Chaos. 2015 Sep;25(9):097620. doi: 10.1063/1.4927448.

Beyond the KdV: Post-explosion development.

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NOAA Earth System Research Laboratory, Boulder, Colorado 80305, USA.
Institute of Applied Physics, Nizhny Novgorod 603950, Russia.
Department of Mathematics, Keele University, Keele ST5 5BG, United Kingdom.
Department of Applied Mathematics, Nizhny Novgorod State Technical University, Nizhny Novgorod 603950, Russia.


Several threads of the last 25 years' developments in nonlinear wave theory that stem from the classical Korteweg-de Vries (KdV) equation are surveyed. The focus is on various generalizations of the KdV equation which include higher-order nonlinearity, large-scale dispersion, and a non-local integral dispersion. We also discuss how relatively simple models can capture strongly nonlinear dynamics and how various modifications of the KdV equation lead to qualitatively new, non-trivial solutions and regimes of evolution observable in the laboratory and in nature. As the main physical example, we choose internal gravity waves in the ocean for which all these models are applicable and have genuine importance. We also briefly outline the authors' view of the future development of the chosen lines of nonlinear wave theory.


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