HR: 0800h
AN: OS41D-0502    [Abstracts]
TI: Strong nonlinear regimes of internal waves and currents in closed basin
AU: * Kanarska, Y
EM: kanarska@ukrpost.net
AF: IMMSP, 42 Glushkov av., Kiev, 03187 Ukraine
AB: The particularities of strong-nonlinear dynamics of the degeneration of basin-scale waves in a rectangular closed basin have been investigated using 3D non-hydrostatic model (Kanarska Maderich, 2003). The classification of the possible flow regimes depending on the amplitude of the initial basin-scale wave and the depth of undisturbed position of the interface (Horn et al. 2001) was extended with the investigation of gravitational current regimes. Such regimes occur when the interface crosses the upper and/or lower boundary of the basin including the case of lock exchange flow when the interface has vertical position with maximum available potential energy. These regimes can not be described in the frame of weakly-nonlinear models of internal waves, because of inverse impact of small scale nonlinear disturbances on large scale motions. The model reproduces variety of strong-nonlinear flows with the formation of Kelvin-Helmholtz instabilities and undular bores which are results of joint impact of nonlinearity, dispersion and dissipation effects. Such flows are important mechanisms for transferring energy and mixing processes in real lakes induced by strong wind forcing.
DE: 4235 Estuarine processes
DE: 4544 Internal and inertial waves
DE: 4568 Turbulence, diffusion, and mixing processes
DE: 3210 Modeling
DE: 3220 Nonlinear dynamics
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting