Surface manifestations of internal waves investigated by a subsurface buoyant jet: 3. Surface manifestations of internal waves

Measurement of Sea Wave Spatial Spectra from High- Resolution Optical Aerospace Imagery

“…An important stage in the comparison of wave spectra obtained from space images and data from wave buoys is the detection of additional spectral harmonics due to anthropogenic effects on the surface waves caused by buried wastewater outfalls in the region of the experiments [7][8][9][10][11][12]. Such spectral harmonics arise under the action of high-frequency internal waves generated by turbulent jets of nonsalty water discharged into the saline marine environment through the diffusers of deep outfalls.…”

“…The brightness field, recorded by the remote sensing equipment at a fixed time, can be expanded in a power series along the surface slopes and is represented in the form [1,11,12]:…”

“…As a rule, analytical estimates of the contribution of the nonlinear component of N to the spatial spectrum of the luminosity field are difficult; therefore, the numerical simulation method is used to solve the problem of constructing the recovery operator [1,[11][12][13].…”

“…The method of constructing the retrieving operator developed and described in this chapter is an extension of the method proposed in [1,5,6,[10][11][12][13][14]. To construct a retrieving operator corresponding to certain image acquisition conditions, direct numerical modeling of optical images is performed under a given set of conditions [8][9][10][11], after which an approximation of the spatial frequency filter (transfer function) [11][12][13][14] is constructed, which allows obtaining a spatial spectrum of sea surface slopes from the aerospace image spectrum.…”

“…Registration of spatial spectra of surface waves is actual in solving many fundamental and applied problems of modern oceanology [1][2][3]. Obtaining information about such spectra is important for studying various physical processes occurring near the ocean-atmosphere interface, detecting water pollution, and monitoring anthropogenic impacts on the marine areas [1,[4][5][6][7][8][9][10][11][12].…”