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Deep Water Ocean Acoustics

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Technical Report,01 Jul 2015,22 Dec 2016

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Ocean Acoustical Services and Instrumentation Systems, Inc Lexington United States

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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 volcanoesearthquakes 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.

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