Abstract
Sound speed and attenuation in sandy seabed were analyzed and reviewed from low-frequency (LF) acoustic measurements, conducted at 18 locations in different coastal zones around the world. [Zhou and Zhang, JASA 117(4), 2494 (2005) and 119 (5), 3447 (2006)]. The resultant sound speed and attenuation in a frequency range of 50-2000 Hz in sandy bottoms can be described equally well by the Biot-Stoll poro-elastic model, the Chotiros BICSQS model [JASA 116(4), 2011-2022 (2004)] or the Buckingham VGS model [JASA 122(3), 1486-1501(2007)]. The geophysical parameters were inverted from the best match between the LF data and each of these three geo-acoustic models. The values of the inverted geophysical parameters were reasonable based on both theoretical considerations and published experimental measurements. A combination of the LF field-inverted data with data from the SAX99 experiment and other recent high-frequency measurements offers a broadband reference data set of sound velocity and attenuation for sandy bottoms in shallow water over a frequency range of 50-400,000Hz. The data-model comparisons show that, with one set of adjustable input parameters, all three geo-acoustic models may perfectly match either the broadband velocity dispersion or broadband attenuation, but not both. These models generally either underestimate dispersion or overestimate LF attenuation. [Work supported by ONR.]
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