The phenomenon of the trapping of guided internal wave packets by horizontally inhomogeneous currents of arbitrary geometry is studied within the framework of linear theory in the WKB approximation. Trapping in this case means the asymptotic approach of an internal wave packet to the boundary of the region where propagation of this wave is allowed, where the packet is stopped in a system connected to the current. It is shown that internal waves are always trapped if the flow streamlines are not closed. Moreover, the wave number and the amplitude of the trapped wave increase exponentially with time, while the vertical mode is transformed in such a way that, as in the case of the simplest (plane) flow geometry, vertical focusing of the wave motion at a depth level corresponding to the Brunt-Vaisala frequency occurs.
|Translated title of the contribution||Trapping of Internal Waves by Horizontally Inhomogeneous Currents of Arbitrary Geometry.|
|Number of pages||11|
|Journal||Izvestia Akademii nauk SSSR. Fizika atmosfery i okeana|
|Publication status||Published - Sep 1985|