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Exact solutions of one-dimensional nonlinear shallow water equations over even and sloping bottoms

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Abstract

We establish an equivalence of two systems of equations of one-dimensional shallow water models describing the propagation of surface waves over even and sloping bottoms. For each of these systems, we obtain formulas for the general form of their nondegenerate solutions, which are expressible in terms of solutions of the Darboux equation. The invariant solutions of the Darboux equation that we find are simplest representatives of its essentially different exact solutions (those not related by invertible point transformations). They depend on 21 arbitrary real constants; after “proliferation” formulas derived by methods of group theory analysis are applied, they generate a 27-parameter family of essentially different exact solutions. Subsequently using the derived infinitesimal “proliferation” formulas for the solutions in this family generates a denumerable set of exact solutions, whose linear span constitutes an infinite-dimensional vector space of solutions of the Darboux equation. This vector space of solutions of the Darboux equation and the general formulas for nondegenerate solutions of systems of shallow water equations with even and sloping bottoms give an infinite set of their solutions. The “proliferation” formulas for these systems determine their additional nondegenerate solutions. We also find all degenerate solutions of these systems and thus construct a database of an infinite set of exact solutions of systems of equations of the one-dimensional nonlinear shallow water model with even and sloping bottoms.

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Authors and Affiliations

  1. Novosibirsk State Technical University, Novosibirsk, Russia

    Yu. A. Chirkunov

  2. Institute for Computation Technologies, Siberian Branch, RAS, Novosibirsk, Russia

    Yu. A. Chirkunov & S. B. Medvedev

  3. Ishlinsky Institute for Problems in Mechanics, RAS, Moscow, Russia

    S. Yu. Dobrokhotov & D. S. Minenkov

  4. Moscow Institute for Physics and Technology, Dolgoprudny, Moscow Oblast, Russia

    S. Yu. Dobrokhotov & D. S. Minenkov

  5. Lomonosov Moscow State University, Moscow, Russia

    S. B. Medvedev

Authors
  1. Yu. A. Chirkunov
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  2. S. Yu. Dobrokhotov
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  3. S. B. Medvedev
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  4. D. S. Minenkov
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Correspondence to Yu. A. Chirkunov.

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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 178, No. 3, pp. 322–345, March, 2014.

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Chirkunov, Y.A., Dobrokhotov, S.Y., Medvedev, S.B. et al. Exact solutions of one-dimensional nonlinear shallow water equations over even and sloping bottoms. Theor Math Phys 178, 278–298 (2014). https://doi.org/10.1007/s11232-014-0143-4

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  • DOI: https://doi.org/10.1007/s11232-014-0143-4

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