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A \((2+1)\)-dimensional nonlinear model for Rossby waves in stratified fluids and its solitary solution. (English) Zbl 1451.76143

Summary: In this paper, we investigate a \((2+1)\)-dimensional nonlinear equation model for Rossby waves in stratified fluids. We derive a forced Zakharov-Kuznetsov(ZK)-Burgers equation from the quasi-geostrophic potential vorticity equation with dissipation and topography under the generalized beta effect, and by utilizing temporal and spatial multiple scale transform and the perturbation expansion method. Through the analysis of this model, it is found that the generalized beta effect and basic topography can induce nonlinear waves, and slowly varying topography is an external impact factor for Rossby waves. Additionally, the conservation laws for the mass and energy of solitary waves are analyzed. Eventually, the solitary wave solutions of the forced ZK-Burgers equation are obtained by the simplest equation method as well as the new modified ansatz method. Based on the solitary wave solutions obtained, we discuss the effects of dissipation and slowly varying topography on Rossby solitary waves.

MSC:

76U65 Rossby waves
35C08 Soliton solutions
35Q51 Soliton equations
35Q53 KdV equations (Korteweg-de Vries equations)
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