In situ measurements of velocity dispersion and attenuation in New Jersey Shelf sediments.
The existence of acoustic velocity dispersion and frequency dependence of attenuation in marine sediments is investigated using in situ measurements from a wideband acoustic probe system during the Shallow Water 2006 experiment. Direct-path pulse propagation measurements show evidence of velocity dispersion within the 10-80 kHz frequency band at two silty-sand sites on the New Jersey Shelf. The measured attenuation in dB/m shows linear frequency dependency within the 10-80 kHz frequency band. The measured velocity dispersion and attenuation curves are in good agreement with those predicted by an extended Biot theory [Yamamoto and Turgut, J. Acoust. Soc. Am. 83, 1744-1751 (1988)] for sediments with a distribution of pore sizes.
Turgut
Altan
A
Yamamoto
Tokuo
T
D000162:Acoustics; D001267:Atlantic Ocean; D019015:Geologic Sediments; D008962:Models, Theoretical; D009038:Motion; D009515:New Jersey; D016062:Porosity; D011825:Radar; D013016:Sound; D013997:Time Factors; D014783:Viscosity