Yu. V. Manilyuk
Marine Hydrophysical Institute of RAS, Sevastopol, Russia
Abstract
Within the framework of the linear approximation of long wave theory, seiche oscillations in a model basin approximating a open-access pool are considered. Using the analytical solution, the periods of the high seishe modes and corresponding velocities of seishe flow are obtained for the bays in the Sevastopol region: the Sevastopol Bay and the Yugnaya Bay. The estimates obtained for the Sevastopol Bay are compared with data of field observations, which showed a satisfactory agreement. It is established that the discreteness of observations of level for detecting seiches in the Sevastopol Bay should not exceed 30 s. The velocities of seiche flows are estimated. Thus, the maximum observed amplitude of level oscillations, equal to 5 – 12 cm, corresponds to flows with velocities of 9.2 to 22.0 cm/s. The conditions for the appearance of harbor oscillations in the Yugnaya Bay are analyzed. It is established that oscillations with 3 min period are the most dangerous, they can be the reason for the appearance of a single-node transverse seiche of Sevastopol Bay and a two-node longitudinal seiche of the Yugnaya Bay, its periods are close to 3 min. The interaction of these waves can lead to a strong harbor oscillation in the Yugnaya Bay. Also, the harbor oscillation in the Yugnaya Bay can cause oscillations with a period of about 1 min, close to the periods of a single-node transverse and two-node longitudinal-transverse seiche of the Yugnaya Bay.
Keywords
seiche in the bay, free waves, long waves, wave flows, open-access pool, analytical solutions, Helmholtz's node, the Sevastopol Bay, the Yugnaya Bay
DOI
10.22449/2413-5577-2018-3-4-12