Tuning, validation, and uncertainty estimates for a sound exposure model

Download
Author
Carmody, Francis J.
Date
2011-09Advisor
Joseph, John
Chiu, Ching-Sang
Metadata
Show full item recordAbstract
To tune and validate the performance of an acoustic model, sound signals were transmitted from a calibrated source, at varied mid-range frequencies, and received on a moored acoustic recording package at the edge of Tanner Bank near the Southern California Anti-Submarine Warfare Range (SOAR). The acoustic monitoring package was constructed of three calibrated Acousonde recorders. Source levels (SL) were measured at 1.8 meters from the source using a Bioacoustic Probe. Signals recorded on the Acousondes and the Bioacoustic Probe were processed to measure transmission loss (TL) and its variability. Measurements were compared with estimates of TL calculated from the Navy Standard Parabolic Equation (NSPE) acoustic model using a first guess geoacoustic bottom based on the literature. Other model inputs included bathymetry from the U.S. Coastal Relief Model, and sound speed profiles from Expendable Bathythermographs (XBT) and the Navy Coastal Ocean Model. Using data garnered from previous studies of the bottom sediment and sub-layer near the Southern California Offshore Range, variations of a geoacoustic model were constructed and input into the NSPE model. TL from all model runs were then analyzed across all frequencies to determine the best fit geoacoustic model to use with NSPE when applying it near SCORE for acoustic predictions. Research was funded by the United States Navy Chief of Naval Operations Environmental Readiness Division (CNO/N45).
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Acoustical Characterization of the Columbia River Estuary
Reeder, D.B. (2014);Investigations of near-shore and in-shore environments have, rightly, focused on geological, thermodynamic and hydrodynamic parameters. A complementary acoustical characterization of the estuarine environment provides ... -
Simulation of the acoustic pulse expected from the interaction of ultra-high energy neutrinos and seawater
Gruell, Michael S. (Monterey, California. Naval Postgraduate School, 2006-03);The purpose of this thesis was to design, build, and test a device capable of simulating the acoustic pulse expected from the interaction between an Ultra-High Energy (UHE) neutrino and seawater. When a neutrino interacts ... -
MEMS acoustic directional finder for small flying UAS [video]
Alves, Fabio; Karunasiri, Gamani (2018-04-18);When compared with the electromagnetic counterparts, acoustic sensors have many advantages that include non-line-of-sight, passive, low-cost, and low power, weight, and size. Acoustic sensors are the primary sensors employed ...