Abstract
Determination of the frequency behavior of modal attenuation coefficients is essential for estimation of propagation influences of poro-elastic sediments. A recent simplification of the Biot model [Pierce et al., J. Acoust. Soc. Am. 114, 2345 (2003)] provides an approach for this determination. For plane compressional waves in a homogeneous medium, the simplified theory reproduces the frequency-squared behavior of the full Biot model. However, data from a variety of shallow water locations suggests power-law exponents that are less than two. Inhomogeneities, particularly in the upper sediment layer, influence the frequency behavior. For a normally consolidated sediment (one never subjected to pressures higher than the current overburden pressure), depth profiles of porosity and sound speed can be estimated [Cederberg et al., J. Acoust. Soc. Am. 97, 2754–2766 (1995)]. We use these profiles to investigate the frequency behavior of the modal attenuations. Comparisons are provided with observations as well as previous numerical studies. [Work supported by ONR.]
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