Abstract
Numerous shallow water acoustic transmission experiments over sandy‐silty bottoms demonstrate that the frequency dependence of intrinsic sediment attenuation at frequencies less than 1 kHz is nonlinear. Computational analyses including modeled geoacoustic profiles have shown that good agreement with experimental data can be obtained for frequencies between 50 Hz and 1 kHz. Upper sediment attenuation values for 1 kHz are in ranges specified by Hamilton [J. Acoust. Soc. Am. 68, 1313–1340 (1980)], and a nonlinear frequency dependent attenuation with power‐law of about 1.8 is necessary. In this presentation, the relationship between the power‐law exponent and modal attenuation coefficients is quantified for several nearly range‐independent experiments in different locations. These include the Gulf of Mexico (1972), the Strait of Korea (ACT III, 1995), the New Jersey Shelf (1995), and Nantucket Sound (2005). The intrinsic sediment attenuation behavior with frequency and depth implies that modal attenuation coe...
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