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Regular version of the site

Article

Vertical structure of velocity field induced by mode-I and mode-II solitary waves in a stratified fluid

European Physical Journal E. 2018. Vol. 41. P. 47.
Pelinovsky E., Kurkin A. A., Kurkina O. E., Rouvinskaya E., Giniyatullin A.

The structure of the velocity field induced by internal solitary waves of the first and second
modes is determined. The contribution from second-order terms in asymptotic expansion into the horizontal
velocity is estimated for the models of almost two- and three-layer fluid for solitons of positive and negative
polarity. The influence of the nonlinear correction manifests itself firstly in the shape of the lines of zero
horizontal velocity: they are curved and the shape depends on the soliton amplitude and polarity, while for
the leading-order wave field they are horizontal. Also the wave field accounting for the nonlinear correction
for mode I has smaller maximal absolute values of negative velocities (near-surface for the soliton of
elevation, and near-bottom for the soliton of depression) and larger maximums of positive velocities. For
solitary waves of negative polarity, which are the most typical for hydrological conditions in the ocean
for low and middle latitudes, the situation is the opposite. The velocity field of the mode-II soliton in a
smoothed two-layer fluid reaches its maximal absolute values in a middle layer instead of near-bottom and
near-surface maximums for mode-I solitons.