Abstract
The propagation loss of low‐frequency acoustic energy at Arctic under‐ice cover depends on various parameters. This talk gives the combined effects of (1) the under‐ice and over‐ice roughnesses; (2) the ice layer thickness; (3) the shear wave speed and the absorption represented, respectively, by the real and imaginary part of the longitudinal plate wave speed; and (4) the physical properties of ice and water, At low frequencies, the Arctic ice cover can be approximated by a rough thin plate. Similarly, the roughness scattering process can be approximated by a small perturbation theory [H. Marsh, J. Acoust. Soc. Am. 33, 330–333 (1961); E. Y. T. Kuo, J. Acoust. Soc. Am. 36, 2135–2142 (1964) and 81, 1762–1766 (1987)]. Compared to experimental propagation loss, the new results improve considerably from the previous predictions that were based on a pressure release boundary condition [F. R. DiNapoli and R. H. Mellen, NUSC TM851130 (1985); E. Y. T. Kuo, NUSC TM871118 (1986)]. It is found that the combined effe...
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