Abstract
Compressional velocity dispersion exists in all marine sediments. If the dispersion is great enough, it may play a significant role in acoustic interaction with the seabed. On the other hand, if dispersion is weak, seabed models and databases can be substantially simpler. The ocean acoustics community is divided on this issue, in part because of the lack of observations. Here we compare two recent methods for measuring dispersion. One technique measures the broadband reflection coefficient (frequency dependence of the critical angle) and thus infers the velocity dispersion. The other technique measures time of flight in an in situ probe over a broadband of frequencies. Measurements on New Jersey Shelf (STRATAFORM area) are compared and implications for the frequency dependence of the compressional wave attenuation are discussed. [Work supported by the Office of Naval Research and NATO Undersea Research Centre.]
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