Abstract
For a low-frequency sound signal propagating in a horizontally inhomogeneous waveguide of a shallow sea, the influence of a fluctuating interface between the water layer and liquid bottom sediments was studied based on statistical modeling within the framework of the cross-sectional method. The modeling was carried out for hydrological conditions, in many situations corresponding to the shallow shelf zones of the Russian Arctic seas. A feature of these water areas is the presence of an almost homogeneous water layer lying on weakly consolidated bottom sediments with various characteristics, including a high degree of gas saturation. The dependence of the average intensity of the sound signal and its individual modes on the parameters of the problem has been studied: the characteristic scale of fluctuations of the interface and the impedance of this interface, which determines its transmitting properties. It is shown that the influence of bathymetry fluctuations on the average intensity of acoustic modes has its own characteristics in comparison with the influence of random volumetric inhomogeneities of sound speed in the water layer and sediments, established earlier. Thus, bottom roughness of a relatively small-scale lead, on average, to increased attenuation of a sound signal when propagating in a waveguide, and this can occur at relatively short distances from the source. An increase in the reflectivity of an irregular bottom boundary weakens the effect of increased sound attenuation so that for typical values of sound speed in the bottom, the attenuation at distances of 10–20 km from the source differs little from that for an undisturbed horizontal boundary.
Published Version
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