Modeling underwater sound propagation in an arctic shelf region with an inhomogeneous bottomстатья
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Дата последнего поиска статьи во внешних источниках: 17 апреля 2024 г.
Аннотация:The seabed data from the Kara Sea (a part of the Arctic Shelf) are used to build a low-frequency (up to 250 Hz)acoustic waveguide model and study sound propagation in this region. A 30-m deep, well-mixed, and homogenouswater layer over a flat seafloor is considered. The seabed’s acoustic model is based on the spatial distribution of asound speed recorded during a three-dimensional seismic survey in the Kara Sea, as well as density data from coresample analysis. One of the region’s most distinctive features is the presence of large areas (up to several tens ofsquare kilometers) where the bottom sound speed is close to that in water. In such a setting, the normal modeapproach is applied to the sound propagation problem. The overall acoustic field is made up of propagating and leakymodes, which include quasi-modes. Numerical simulations show a high spatial variability of attenuation in the waveguide,1.5 to 20 dB/km at 137 Hz. Even if the water depth is constant and the seafloor is uniform and smooth, modecoupling and horizontal refraction can occur owing to the bottom inhomogeneities. For higher modes, the predictedangle of refraction is up to 10 degree.