Estimating bubble size in Lake Kinneret through reflection of wideband sound signals from gas-rich sediment environment

Ernst Uzhansky, Boris Katsnelson, Andrey Lunkov, Regina Katsman, Anatoliy Ivakin

Research output: Contribution to journalConference articlepeer-review


Gas-rich sediments cause permanent concern due to their contribution to sediment destabilization and global warming. In this paper, an effective media theory of gassy sediments previously suggested by the authors is tested experimentally in Lake Kinneret using wideband acoustic signals. Results of experiments and the corresponding acoustic data processing is presented. Ten 5-s long wideband (0.3-15 kHz) chirp pulses were radiated by an underwater transducer mounted directly at a 30-m long seven-channel vertical line array (VLA) deployed in the central part of the lake (the seafloor depth is 35 m). Received sound field timeseries consists of a sequence of pulse arrivals comprised of specular reflections from interfaces followed by reverberation codas caused by non-specular scattering from the interface roughness and volume inhomogeneity. Having studied the frequency dependence of the signal reflected from the bottom, a dip in the reflection coefficient was found at frequencies of 4-6 kHz. This suggests the existence of bubbles with an effective spherical diameter of about 3 mm, which is consistent with previous direct measurements of bubbles in the lake sediments.

Original languageEnglish
Article number005001
JournalProceedings of Meetings on Acoustics
Issue number1
StatePublished - 5 Dec 2022
Event183rd Meeting of the Acoustical Society of America, ASA 2022 - Nashville, United States
Duration: 5 Dec 20229 Dec 2022

Bibliographical note

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© 2022 Acoustical Society of America. All rights reserved.

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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