Accession Number : AD1025892


Title :   Deep Water Ocean Acoustics


Descriptive Note : Technical Report,01 Jul 2015,22 Dec 2016


Corporate Author : Ocean Acoustical Services and Instrumentation Systems, Inc Lexington United States


Personal Author(s) : Heaney,Kevin


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/1025892.pdf


Report Date : 22 Dec 2016


Pagination or Media Count : 29


Abstract : In this work for code 32 (Ocean Acoustics) of the Office of Naval Research, OASIS has focused on the development of new propagation models and their application to problems in acoustic propagation in deep water, including global scale acoustic propagation relevant to geophysics sound sources (volcanoes/earthquakes) and the detection of nuclear test event. The Peregrine PE model was developed as an re-coding in C of the Range-dependent Acoustic Model (RAM). This code was extended to 3-dimensions by applying the split-step Pade kernel in cross-range at each range step. The kernel of Peregrine (Seahawks) has been submitted to the Ocean Atmospheric Media Library (OAML). Peregrine was applied to hydroacoustic recordings from a Comprehensive Test Ban Treaty Organization (CTBTO) of a seismic tomography experiment off of Japan, with excellent quantitative agreement in both the energy received and the travel time, both exhibiting strong 3D propagation. A paper was published on using noise correlations to estimate local sound speed, as well as the horizontal deflection caused by mesoscale eddies as they traverse long ranges. Propagation and ambient noise analysis was conducted on the North Pacific Acoustics Laboratory Philippine Sea tests 2009 and 2010, both of which Dr. Heaney participated as a co-chief scientist.


Descriptors :   underwater acoustics , acoustic propagation , deep water , detection , models , noise , travel time , deflection , ambient noise


Distribution Statement : APPROVED FOR PUBLIC RELEASE