Investigation of Free Liquid Oscillations in a Bounded Basin Representing an Approximate Model of the Sea of Azov
Yu.V. Maniliuk, L.V. Cherkesov |
Marine Hydrophysical Institute, Russian Academy of Sciences, Sevastopol, Russian Federation |
E-mail: uvmsev@yandex.ru |
Abstract
Based on the analytic solution of long wave equations, the features of seiches and seiche-like oscillations (combination of different seiche modes) in the model basin, which has the characteristic size of the Azov Sea, are considered.
It was found that fluctuations of sea level forced by seiche-like oscillations are strongly different from the ones of the level due to seiche oscillations. Seiche-like fluctuations have a single level nodal line which changes its position in time, turning counter-clockwise. The maximum elevation level in the selected areas of the basin approached to the maximum possible value which is equal to the sum of the amplitudes of the interacting waves in the initial moment of time. The maximum value of the velocity modulus of the wave flows in all the cases was significantly less than the maximum possible value.
At seiche oscillations the currents have a direction which is constant during the half-period and then it changes into the opposite one. Also the presence of counter and diverging flows is characteristic of seiches. In case of seiche-like oscillations the direction of wave currents always changes with time, velocity vectra are turning clockwise at that. Counter and diverging flows are absent.
Keywords
seiches, seiche-like oscillations, free waves, long waves, currents, the Sea of Azov, analytic solution.
DOI: 10.22449/1573-160X-2016-2-14-23