A Brief History of Sediment Acoustics

date December 5, 2014
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Friday, December 5, 2014 4:00 p.m. ETC 4.150

Anthony L. Bonomo
Applied Research Laboratories
The University of Texas at Austin
http://www.arlut.utexas.edu

The acoustic behavior of sediments has been studied extensively. The earliest models were based on the assumption that sediments behaved like fluids. Since sediments generally can support shear stresses, the assumptions made when using fluid models were found to be tenuous at best, and many of these models have been replaced with those treating the sediment as an elastic or viscoelastic medium. However, it has recently been shown that model predications and experimental results are in better accord when the sediment is assumed to behave as a poroelastic medium governed by Biot theory. This talk intends to serve as a primer on the development of fluid, elastic, and poroelastic sediment models and will attempt to give historical justification supporting the uses and limitations of each. Recent attempts at formulating more sophisticated and comprehensive sediment models such as the Viscous Grain Shearing model of Buckingham and the Extended Biot model of Chotiros will be discussed as well.