Analysis of the influence of turbulence and environmental variability on broadband acoustic coherence

Download
Author
Eroglu, Ozer
Date
2004-09Advisor
Smith, Kevin B.
Buttrey, Samuel E.
Metadata
Show full item recordAbstract
Acoustic propagation in the littoral regions of the world, even over short ranges,
can be complex at high frequencies (>5 kHz), and applications such as underwater detection and communications suffer as a result. To this end, the Asian Seas International Acoustics Experiment (ASIAEX) was conducted with funding from the Office of Naval Research. One phase of this experiment took place from 29 May to 9 June 2001 and focused on short-range, shallow water acoustic propagation in the East China Sea. This thesis will be based on some of the measurements taken during the East China Sea experiment by a team from the Applied Physics Laboratory of the University of Washington. The environmental parameters and array geometry used in this and previous modeling work are as close as possible to the experiment. The objective of this thesis is to better understand the nature of turbulent perturbations and how they affect short-range acoustic propagation in a shallow water environment. This will include variations in total energy of the turbulence, variations in associated length scales, and variations in depth. In addition, the influence of other variable factors on signal coherence will also be examined. Most notably, variations in background sound-speed structure and source depth variability will be included.
Rights
Copyright is reserved by the copyright owner.Collections
Related items
Showing items related by title, author, creator and subject.
-
Structure and evolution of thermohaline staircases in tropical North Atlantic
Wall, Steven E. (Monterey, California. Naval Postgraduate School, 2007-12);This study explores the dynamics of salt finger convection which occurs when warm, salty water overlies cool and fresh. Salt finger convection is generally observed in mid-latitude regions, particularly in the Atlantic ... -
A smart climatology of evaporation duct height and surface radar propagation in the Indian Ocean
Twigg, Katherine L. (Monterey, California. Naval Postgraduate School, 2007-09);Surface electromagnetic propagation over the ocean is highly sensitive to near-surface atmospheric variability, particularly the height of the evaporation duct. Seasonal variation in near-surface meterological factors and ... -
An analysis of the Beaufort Sea thermohaline structure and variability, and its effects on acoustic propagation
Pearson, Annalise N. (Monterey, California. Naval Postgraduate School, 2016-06);This thesis provides an analysis of spatial and temporal thermohaline variations of the Canada Basin in the Western Arctic and examines how these variations affect sound speed fields and acoustic propagation. In recent ...