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- W2046331243 abstract "Experimental measurements of the frequency dependence of sound propagation losses in the top layers of the ground were performed in the frequency range between 80 and 420 Hz. These measurements revealed that the distribution of energy on the frequency-range plane has a regular structure. The features of this structure were modeled in the modal approach for a gradient model of the ground. It was shown that average sound speed in the ground and the approximate depth of the layers may be estimated through analysis of the experimentally measured frequency-range distribution of energy. The technique explores the waveguide properties of the top layer of the ground. According to the mode theory, two asymptotes coming from the point (0,0) should exist on the wave number-frequency plane. From the slope of these asymptotes, the minimum and maximal sound speeds in the waveguide were found to be 100 and 530 m/s. The approximate depth of the layers was estimated. Comparisons of obtained sound speeds and depth of layers with independently estimated values show satisfactory agreement. [Work supported by ONR Grant N00014-02-1-0878.]" @default.
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- W2046331243 date "2004-10-01" @default.
- W2046331243 modified "2023-10-16" @default.
- W2046331243 title "Modal analysis of broadband acoustic signals propagating in the top layer of the ground" @default.
- W2046331243 doi "https://doi.org/10.1121/1.4784957" @default.
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