SELF-EXCITED OSCILLATIONS IN THE DRIFTING ICE COVER OF THE ARCTIC OCEAN

Abstract

During the monitoring of physical-mechanical state of the ice cover of the Arctic Ocean a wide spectrum of oscillation and wave processes was in the system ice-water studied. The investigations were carried out on the drifting stations “North Pole” with seismometers and tiltmeters. Vertical and horizontal displacements in the ice field characterize parameters of wave processes caused by compression and ridging of ice-mechanical self-excited oscillations. Mechanics of appearance and propagation of waves can be considered with an account of elastic-viscous properties of the ice cover. A phenomenological model is considered of appearance of periodic horizontal displacements on an extensive rupture in a continuous ice cover. At the fault of stresses on the rupture elastic horizontally polarized waves are emitted.