TUESDAY MORNING, 20 APRIL 2010 GRAND BALLROOM V, 9:15 A.M. TO 12:00 NOON Session 2aAO Acoustical Oceanography and Underwater Acoustics: Environmental Effects on Acoustic Propagation

Content Provider	Semantic Scholar
Author	Cockrell, Kevin L. Eickmeier, Justin M. Tashmukhambetov, Arslan M. Ioup, George E. Ioup, Juliette W.
Copyright Year	2010
Abstract	Observations show that shallow water bottom relief often has a bandlimited directional spectrum produced by various oceanographic and geological processes. This directional bottom feature is shown to have a noticeable effect on three-dimensional low-frequency acoustic propagation. An analytical study with an idealized model of straight sea bottom ripples has shown that acoustic energy can be partially ducted between neighboring ripples, and this ducting will affect acoustic propagation in shallow water. In our work, we also study ducting and refracting due to idealized curved sea bottom ripples. Previous research has shown that non-linear internal waves can also create acoustical ducts. Comparative analysis of these two different ducts is performed using our idealized model. The combined effects of internal waves and bathymetry are studied for various relative directions of internal wave front and bottom ripples. A numerical simulation of threedimensional sound propagation across realistic bathymetry and internal wave fluctuations is performed. In conclusion, both water column fluctuations and bathymetry variability need to be taken into account when studying three-dimensional acoustic propagation in shallow water.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://eprints.soton.ac.uk/147621/1/Pub11723.pdf
Alternate Webpage(s)	http://asa.aip.org/baltimore/tuesdayam.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article