Amplitude-phase Structure of Internal Gravity Waves Fields in Ocean with Shear Flows

The problem of the harmonic internal gravity waves generation in the ocean with real and model hydrological characteristics is solved. For real and model distributions of the buoyancy frequency and background shear flows the results of numerical calculations of the wave fields amplitude-phase characteristics are presented. The transformation of the internal gravity waves fields amplitude-phase patterns is studied numerically. Numerically it is shown that relatively short-wave packets can concentrate at depths where there are extrema of a function that depends on the components of the wave vector and the vector of shear currents. It is also shown that the spatial variability of the wave packets propagation direction can lead to a rather noticeable vertical amplitude rearrangement of the eigenfunctions. It is shown that the use of model representations for the main hydrological characteristics (buoyancy frequency and background shear currents) makes it possible to simplify the main spectral problem. It is shown that model representations of hydrological characteristics make it possible to qualitatively correctly describe the main features of dispersion surfaces and wave fields phase structures. To describe the wave fields amplitude dependences it is necessary to use the results of a main spectral problem numerical solutions.