Bilinearization and new soliton solutions of Whitham-Broer-Kaup equations with time-dependent coefficients


Authors

Sheng Zhang - School of Mathematics and Physics, Bohai University, Jinzhou 121013, China.
Zhaoyu Wang - School of Mathematics and Physics, Bohai University, Jinzhou 121013, China.


Abstract

In this paper, Whitham–Broer–Kaup (WBK) equations with time-dependent coefficients are exactly solved through Hirota’s bilinear method. To be specific, the WBK equations are first reduced into a system of variable-coefficient Ablowitz–Kaup– Newell–Segur (AKNS) equations. With the help of the AKNS equations, bilinear forms of the WBK equations are then given. Based on a special case of the bilinear forms, new one-soliton solutions, two-soliton solutions, three-soliton solutions and the uniform formulae of n-soliton solutions are finally obtained. It is graphically shown that the dynamical evolutions of the obtained one-, two- and three-soliton solutions possess time-varying amplitudes in the process of propagations.


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