Analysis of very high frequency propagation in sediments: experimental results and modelling

Brothers, R., Page, S., Heald, G.J., Leighton, T.G., Simpson, M.D. and Dix, J.K. (2002) Analysis of very high frequency propagation in sediments: experimental results and modelling. Journal of the Acoustical Society of America, 112 (5), 2394.

Abstract

A current QinetiQ study is investigating the propagation of sound waves into sediment at frequencies higher than 300 kHz. Previous work has found notable discrepancies between model predictions and experimental results and comparisons are inconsistent and unreliable. This new work package investigates the development of new scattering theories for frequencies ranging from 300 kHz to 1 MHz. In particular, the application of a pseudospectral time difference approached is analyzed. The model originally developed for lower frequency applications, is set up in various geometrical scenarios and for varying very high frequencies. Results show the received simulated pulses obtained for hydrophones placed within the sediment and source colocated. Furthermore, simulations are compared in tank experimental data. The controlled tank experiments were conducted by Southampton University and data are analyzed and discussed for various conditions and frequencies.

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Contributors

Author: T.G. Leighton

Author: J.K. Dix

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