Date of Award

Spring 5-2016

Degree Type

Honors College Thesis


Physics and Astronomy

First Advisor

Michael D. Vera

Advisor Department

Physics and Astronomy


The goal of this research is to characterize the impact of using an equivalent-fluid method for a solid seabed on the use of time reversal procedures for detecting the origin location of an emitted sound. There are two different ways of modeling how sound propagates through water: modeling sound as a ray and modeling sound as a wave. It is easier to model the propagation of sound through water with a ray model; using a ray model allows for the collection of grazing angles with respect to the bottom. These will be important when determining bottom intensity loss of the sound when taking the equivalent fluids into account. When a sound wave interacts with the bottom of the ocean it is hard to estimate how much energy is lost to the bottom; the equivalent-fluid method is a way to simulate the ocean floor's density as a complex density so that it can be easily manipulated and affect how much intensity is lost to the bottom. The equivalent-fluid method will introduce errors when calculating the bottom loss from the ray grazing angles; this research will hinge on finding how much these errors will affect time reversal simulations. The results were rendered inconclusive, but can be confirmed with future research. This research could be applicable in the field of wildlife detection as well as long range vessel detection.