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Anatoliy Ivakin

Senior Principal Physicist






Anatoliy Ivakin's research interests include wave propagation and scattering in continuous and discrete media with rough interfaces and volume heterogeneity, theoretical and numerical modeling of random processes and fields, signal processing and inversion techniques, environmental acoustics and applications to underwater reverberation and remote sensing, sea-bed and sea-ice characterization, marine ecology, as well as detection and assessment of oil, gas, and gas hydrates, and environmental monitoring and evaluation of risks related to offshore oil and gas exploration, production, and transportation.

Dr. Ivakin joined APL-UW as a Senior Physicist in 2001 and was elected to Fellowship in the Acoustical Society of America the same year.

Department Affiliation



M.S. Physics, Moscow Institute of Physics and Technology, 1978

Ph.D. Physics and Mathematics, Andreev Acoustics Institute, Moscow, 1982


2000-present and while at APL-UW

Observed correlations between the sediment grain size and the high-frequency backscattering strength

Wendelboe, G., T. Hefner, and A. Ivakin, "Observed correlations between the sediment grain size and the high-frequency backscattering strength," JASA Express Lett., 3, doi:10.1121/10.0017107, 2023.

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1 Feb 2023

In March 2019, Teledyne RESON and the Applied Physics Laboratory at the University of Washington conducted surveys with a calibrated multibeam echosounder at ten sites in Sequim Bay, a shallow sheltered bay in Washington State, USA. For each site, the mean grain size was obtained from a diver core sample, and estimates of the backscattering strength at frequencies ranging between 200 and 350 kHz were calculated. The correlation between the backscattering strength and the normalized grain size have been investigated for the grazing angles 45° and 75°. For 45°°, a correlation consistent with previous results has been found. It demonstrates the potential for simple seabed classification.

Sonar observations of heat flux of diffuse hydrothermal flows

Jackson, D., K. Bemis, G. Xu, and A. Ivakin, "Sonar observations of heat flux of diffuse hydrothermal flows," Earth Space Sci., 9, doi:10.1029/2021EA001974, 2022.

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1 Oct 2022

Previous work using multibeam sonar to map diffuse hydrothermal flows is extended to estimate the heat output of diffuse flows. In the first step toward inversion, temperature statistics are obtained from sonar data and compared to thermistor data in order to set the value of an empirical constant. Finally, a simple model is used to obtain heat-flux density from sonar-derived temperature statistics. The method is applied to data from the Cabled Observatory Vent Imaging Sonar (COVIS) deployed on the Ocean Observatories Initiative's Regional Cabled Array at the ASHES vent field on Axial Seamount. Inversion results are presented as maps of heat-flux density in MW/m2 and as time series of heat-flux density averaged over COVIS' field of view.

Midfrequency acoustic propagation and reverberation in a deep ice-covered Arctic ocean

Ivakin, A.N., and K.L. Williams, "Midfrequency acoustic propagation and reverberation in a deep ice-covered Arctic ocean," J. Acoust. Soc. Am., 152, 1035-1044, doi:10.1121/10.0013503, 2022.

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1 Aug 2022

A model-based analysis of sound transmission in a deep ice-covered Arctic ocean recorded during the Ice Experiment 2014 is presented. A source of opportunity transmitted mid-frequency (3500 Hz) 5 s duration continuous wave pulses. The source and receiver were omnidirectional, located under ice at a ~30 m depth at a ~719 m distance from each other. Recorded acoustic intensity time series showed a clear direct blast signal followed by an about 30 s duration reverberation coda. The model considers several types of arrivals contributing to the received signal at different time intervals. The direct signal, corresponding to a short-range nearly horizontal propagation, is strongly affected by the presence of a weak near-surface (within 50 m depth) acoustic channel. Reverberation coda that follows the direct signal corresponds to medium-range bottom- and ice-bounced arrivals from steep angles which are controlled by reflectivity and scattering strengths of ice and bottom, their physical properties, and acoustical parameters.

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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