Finite-Amplitude Wave Propagation through Water-Saturated Marine Sediments

ISSN： 1610-1928

Source： Acta Acustica united with Acustica, Vol.38, Iss.4, 1977-10, pp. : 195-200

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

The dimensionless, second-order parameter of acoustic nonlinearity B/A of samples of watersaturated marine sediments is determined using a thermodynamic procedure. The infinitesimal amplitude absorption coefficients at 1 kHz, 10 kHz and 100 kHz for the sediment samples are measured and a calculation of the second harmonic amplitude as a function of distance from a source transmitting plane, finite-amplitude, sinusoidal waves into a water-saturated sediment has been performed using Keck and Beyer's perturbation solution to a wave equation governing finite-amplitude wave propagation through a viscous fluid. It is concluded that strong finiteamplitude wave distortion effects, which should be expected in water-saturated sediments due to their relatively high B/A -values, are suppressed by the even stronger absorption effects by means of which only very weak and in praxis, vanishing, nonlinear acoustic effects will be encountered by the use of sources of high-intensity sound in sediments for the study of bottom and subbottom materials and profiles.