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David Dall'Osto

Senior Research Scientist/Engineer

Email

dallosto@uw.edu

Phone

206-221-5085

Department Affiliation

Acoustics

Education

B.S. Mechanical Engineering, Vanderbilt University, 2006

M.S. Mechanical Engineering, University of Washington, 2009

Ph.D. Mechanical Engineering, University of Washington, 2013

Publications

2000-present and while at APL-UW

Active intensity vortex and stagnation point singularities in a shallow underwater waveguide

Dahl, P.H., D.R. Dall'Osto, and W.S. Hodgkiss, "Active intensity vortex and stagnation point singularities in a shallow underwater waveguide," J. Acoustic. Soc. Am., 154, 1482-1492, doi:10.1121/10.0020836, 2023.

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11 Sep 2023

Vector acoustic properties of a narrowband acoustic field are observed as a function of range from a source towed in waters of depth 77 m on the New England Mud Patch. At the source frequency (43 Hz), the waveguide supported three trapped modes, with mode 2 weakly excited owing to the towed source depth. The receiving sensor was positioned 1.45 m above the seafloor with a sampling range aperture of 2500 m. The vector acoustics observations enabled study of vortex regions that encompass two singular points for active acoustic intensity: the vortex point, which is co-located with a dislocation, and stagnation point. Interpretative modeling, based on the normal modes and using a geoacoustic model consistent with those emerging from studies conducted at this location, is in agreement with these measurements. Model-data comparisons were based on the first-order variables of acoustic pressure and velocity along with inverse Hankel transforms, which yield normalized horizontal wavenumber spectra, and second-order variables in the form of horizontal and vertical intensity as well as non-dimensional intensity-based ratios. These measures provide a degree of observational confirmation of some vortex region properties. Both observations and modeling point to a gradual deepening of such regions with increasing range owing to sediment attenuation.

Basin scale coherence of Kauai–Beacon m-sequence transmissions received at Wake Island and Monterey, CA

Gemba, K.L., N.C. Durofchalk, D.R. Dall'Osto, R.K. Andrew, P. Leary, B.M. Howe, and K.B. Smith, "Basin scale coherence of Kauai–Beacon m-sequence transmissions received at Wake Island and Monterey, CA," JASA Express Lett., 3, doi:10.1121/10.0020514, 2023.

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9 Aug 2023

The 75 Hz Kauai–Beacon source is well-situated for observing the North Pacific Ocean acoustically, and ongoing efforts enable transmissions and analysis of broadband signals in 2023 and beyond. This is the first demonstration of acoustic receiving along paths to Wake Island (~3500 km) and Monterey Bay (~4000 km). The 44 received m-sequence waveforms exhibit excellent phase stability with processing gain approaching the maximum theoretical gain evaluated over the 20 min signal transmission duration. The article concludes with a discussion on the future source utility and highlights research topics of interest, including observed Doppler (waveform dilation), thermometry, and tomography.

The sound from underwater explosions

Dall'Osto, D.R., P.H. Dahl, and N.R. Chapman, "The sound from underwater explosions," Acoustics Today, 19, 12-19, 2023.

1 Mar 2023

More Publications

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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