Study of interaction between intense internal wave solitons in the context of the Choi-Camassa model

• Published in: Izvestiya. Atmospheric and oceanic physics 2011-06, Vol.47 (3), p.336-349
• Main Authors: Gorshkov, K. A., Ostrovskii, L. A., Soustova, I. A., Zaitseva, N. V., Shevts, L. M.
• Format: Article
• Language: English
• Subjects: Atmospheric models; Climatology; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Internal waves; Marine; Physics; Solitary waves
• ISSN: 0001-4338; 1555-628X
• DOI: 10.1134/S0001433811030078

Based on the approximated theory developed by the authors to describe the interaction of complex solitons that are formed by kinks, i.e., drops of fields of different polarity, the features of the dynamics of intense internal wave solitons are studied in the context of nonintegrable Choi-Camassa equations. These equations describe the evolution of long internal waves with arbitrary amplitudes in a two-layer fluid. Making allowance for the complex character of the limiting amplitude solitons made it possible to study the dynamics of their interaction as longitudinal (not pointlike) formations for the first time. A series of the features of soliton interaction caused by the complexity of their structure is discovered and explained. These include the appearance of solitary waves with opposite polarity in the collision process, anomalously large phase shifts, etc. The existence of these features is verified by numerical experiments in the context of internal wave models permitting the existence of complex solitons.