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Title: Undular bore theory for the Gardner equation
Authors: Kamchatnov, A.M.
Kuo, Y.-H.
Lin, T.-C.
Horng, T.-L.
Gou, S.-C.
Clift, Richard
El, G.A.
Grimshaw, Roger H.J.
Issue Date: 2012
Publisher: © American Physical Society
Citation: KAMCHATNOV, A.M. ... et al, 2012. Undular bore theory for the Gardner equation. Physical Review E, 86 (3), paper 036605, 23pp.
Abstract: We develop modulation theory for undular bores (dispersive shock waves) in the framework of the Gardner, or extended Korteweg–de Vries (KdV), equation, which is a generic mathematical model for weakly nonlinear and weakly dispersive wave propagation, when effects of higher order nonlinearity become important. Using a reduced version of the finite-gap integration method we derive the Gardner-Whitham modulation system in a Riemann invariant form and show that it can be mapped onto the well-known modulation system for the Korteweg–de Vries equation. The transformation between the two counterpart modulation systems is, however, not invertible. As a result, the study of the resolution of an initial discontinuity for the Gardner equation reveals a rich phenomenology of solutions which, along with the KdV-type simple undular bores, include nonlinear trigonometric bores, solibores, rarefaction waves, and composite solutions representing various combinations of the above structures. We construct full parametric maps of such solutions for both signs of the cubic nonlinear term in the Gardner equation. Our classification is supported by numerical simulations.
Description: This paper was originally published in the journal Physical Review E (© American Physical Society) at: http://dx.doi.org/10.1103/PhysRevE.86.036605
Version: Published
DOI: 10.1103/PhysRevE.86.036605
URI: https://dspace.lboro.ac.uk/2134/17005
Publisher Link: http://dx.doi.org/10.1103/PhysRevE.86.036605
ISSN: 1539-3755
Appears in Collections:Published Articles (Maths)

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