Effect of Shear on Modal Arrival Times

Potty, Gopu R.; Miller, James H.

doi:10.1109/joe.2019.2925920

Cited by 21 publications

(5 citation statements)

References 34 publications

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“…Additionally, our study assumed the negligible shear wave effect on modal travel time, potentially posing another limitation in reducing distance errors. Potty and Miller (2020) reported that the impact of shear waves may intensify within the low-order mode Airy phase region, characterized by the minimum group velocity.…”

Section: Discussionmentioning

confidence: 99%

Estimation of geoacoustic parameters and source range using airgun sounds in the East Siberian Sea, Arctic Ocean

Lee,

Han,

Choi

et al. 2024

Front. Mar. Sci.

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Dispersion is a representative property of low-frequency sound propagation over long distances in shallow-water waveguides, making dispersion curves valuable for geoacoustic inversion. This study focuses on estimating the geoacoustic parameters using the dispersion curves extracted from airgun sounds received in the East Siberian Sea. The seismic survey was conducted in September 2019 by the icebreaking research vessel R/V Araon, operated by the Korea Polar Research Institute. A single hydrophone was moored at the East Siberian Shelf, characterized by nearly range-independent shallow water (<70 m) with a hard bottom. In the spectrogram of the received sounds, the dispersion curves of the first two modes were clearly observed. Utilizing a combination of warping transform and wavelet synchrosqueezing transform these two modes were separated. Then, the geoacoustic parameters, such as sound speed and density in the sediment layer, were estimated by comparing the two modal curves extracted at a source-receiver distance of approximately 18.6 km with the predictions obtained by the KRAKEN normal-mode propagation model. Subsequently, the distances between the airgun and the receiver system in the 18.6 to 121.5 km range were estimated through the comparison between the measured modal curves and the model replicas predicted using the estimated geoacoustic parameters.

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Section: Discussionmentioning

confidence: 99%

Estimation of geoacoustic parameters and source range using airgun sounds in the East Siberian Sea, Arctic Ocean

Lee,

Han,

Choi

et al. 2024

Front. Mar. Sci.

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“…A suite of acoustic propagation measurements were obtained in March, 2017, and included multiple propagation tracks, with a variety of sources and receivers. The 2017 data were analyzed extensively by the SBCEX group [11], and used in many geoacoustic inversion studies, e.g., [25], [26], [35], [36], [37], [38], [39], [40], [41], [42].…”

Section: A Experimental Areamentioning

confidence: 99%

Geoacoustic Inversion Using Simple Hand-Deployable Acoustic Systems

Bonnel

McNeese

Wilson

et al. 2023

IEEE J. Oceanic Eng.

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This article proposes the use of a simple, low-cost, hand-deployable pair of experimental assets to conduct geoacoustic inversion at sea. The system consists of an expendable, fully mechanical acoustic source called a rupture induced underwater sound source (RIUSS) and a new ropeless passive acoustic mooring called a TOSSIT (not an acronym). Used together, RIUSS and TOSSIT enable the collection of acoustic data suitable to perform single-hydrophone geoacoustic inversion. The method is illustrated using data collected on the New England Mud Patch in May 2021 from a relatively small (22 m) and inexpensive chartered fishing vessel. Modal time-frequency dispersion from 15 to 385 Hz is extracted from the TOSSIT/RIUSS data using warping, and used as input for Bayesian transdimensional geoacoustic inversion. The inversion results compare favorably to results obtained with data collected on the same track with traditional assets (e.g., a vertical line array) during the 2017 Seabed Characterization Experiment, even when jointly inverting for the water-column sound speed profile and seabed geoacoustic parameters. This further demonstrates inversion repeatability in a given location using data sets collected years apart, and under different (and potentially unknown) oceanographic conditions.

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“…Classically, most other ocean acoustics experiments involve the use of synchronized arrays of sensors to perform spatial and temporal filtering. However, recent advances in data science and signal processing now enables localizing a source or characterizing the propagation environment with a single hydrophone [16] , [17] , [18] , [19] , [20] , [21] . Those applications would also greatly benefit from the TOSSIT concept.…”

Section: Hardware In Contextmentioning

confidence: 99%

“…From 2015 to 2017, SBCEX focused on the ‘‘New England Mud Patch’’, a shallow water (depth ∼ 75 m) location about 95 km south of Martha’s Vineyard, MA, USA [8] . Several important SBCEX results were obtained using single receiver studies [18] , [19] , [20] , [21] , which motivated the use for TOSSIT for later experiments. In 2021, the SBCEX study area was extended to cover the deeper water of the New England Shelf Break, about 150 km south of Martha’s Vineyard with water depth up to 500 m. Six TOSSITs were used on the New England Shelf break in 2021 as part of SBCEX, and it is expected that up to 20 TOSSITs will be used in 2022 to cover both the Mud Patch and the Shelf Break.…”

Section: Seabed Characterization Experiments 2021mentioning

confidence: 99%