scholarly journals Sound scattering from near‐surface bubble clouds

1992 ◽  
Vol 92 (4) ◽  
pp. 2392-2392
Author(s):  
Jeff Schindall ◽  
William M. Carey ◽  
Ronald A. Roy ◽  
Lawrence A. Crum ◽  
Michael Nicholas
Keyword(s):  
Sound Scattering ◽  
Near Surface ◽  
Bubble Clouds ◽  
Surface Bubble

Temporal coherence of acoustic signals propagating through the near surface bubble layer

2002 ◽  
Vol 112 (5) ◽  
pp. 2424-2424
Author(s):  
R. Lee Culver ◽  
David Bradley ◽  
Jon Reeves
Keyword(s):  
Acoustic Signals ◽  
Temporal Coherence ◽  
Near Surface ◽  
Bubble Layer ◽  
Surface Bubble

Distribution of zooplankton inferred from hydroacoustic backscatter data in coastal waters off Ningaloo Reef, Western Australia

2002 ◽  
Vol 53 (6) ◽  
pp. 1005 ◽  
Author(s):  
Steven G. Wilson ◽  
Timothy Pauly ◽  
Mark G. Meekan
Keyword(s):  
Western Australia ◽  
Coastal Waters ◽  
Near Surface ◽  
Rhincodon Typus ◽  
Ningaloo Reef ◽  
The North ◽  
Whale Sharks ◽  
Bubble Layer ◽  
Surface Bubble

Hydroacoustic surveys were used to examine zooplankton distributions in coastal waters off Ningaloo Reef, Western Australia. Surveys were timed to coincide with the seasonal aggregation of whale sharks, Rhincodon typus, and other large zooplanktivores in these waters. The surveys examined scattering features of lagoon/shelf fronts, a series of cross-shelf transects and waters surrounding whale sharks swimming at the surface. These suggested that lagoon waters flow intrusively into shelf waters at reef passages in a layered exchange. Cross-shelf transects identified three vertical scattering layers: a surface bubble layer; a near-surface minimum layer; and a bottom maximum layer. Regions of intense mixing of lagoon and shelf waters were detected seaward and to the north of reef passages. Integrated acoustic mean volume backscatter of the bottom maximum layer increased with depth and distance offshore. Large subsurface aggregations of unidentified fauna were detected beneath whale sharks in the same area that manta rays and surface schools of euphausiids were also observed.

Effects of Wind-Induced Near-Surface Bubble Plumes on the Performance of Underwater Wireless Acoustic Sensor Networks

2016 ◽  
Vol 16 (11) ◽  
pp. 4092-4099 ◽  
Author(s):  
Amit Kumar Mandal ◽  
Sudip Misra ◽  
Tamoghna Ojha ◽  
Mihir Kumar Dash ◽  
Mohammad S. Obaidat
Keyword(s):  
Sensor Networks ◽  
Acoustic Sensor ◽  
Near Surface ◽  
Bubble Plumes ◽  
Acoustic Sensor Networks ◽  
Surface Bubble

Nonlinear sound scattering by subsurface bubble clouds in sea

2000 ◽  
Vol 107 (5) ◽  
pp. 2893-2893
Author(s):  
Lev A. Ostrovsky ◽  
Zinovy Kluzek ◽  
Alexander M. Sutin ◽  
Irina A. Soustova ◽  
Alexander I. Matveev ◽  
...  
Keyword(s):  
Sound Scattering ◽  
Bubble Clouds

FDTD modeling of low‐frequency sea surface reverberation in the presence of a near‐surface bubble layer

2000 ◽  
Vol 107 (5) ◽  
pp. 2922-2922
Author(s):  
Richard S. Keiffer ◽  
Robert A. Zingarelli ◽  
Jorge C. Novarini
Keyword(s):  
Low Frequency ◽  
Sea Surface ◽  
Near Surface ◽  
Bubble Layer ◽  
Surface Bubble

scholarly journals ABOUT THE USE OF NON-LINEAR SOUND SCATTERING FOR ESTIMATING THE OFFSHORE GAS FLARES STRUCTURE AND LENGTH COMPOSITION

2020 ◽  
pp. 45-52
Author(s):  
В.А. Буланов ◽  
И.В. Корсков ◽  
Е.В. Соседко
Keyword(s):  
Size Distribution Function ◽  
Gas Content ◽  
The Arctic ◽  
Arctic Seas ◽  
Sound Scattering ◽  
Near Surface ◽  
Sea Floor ◽  
Gas Flares ◽  
Standard Application ◽  
Remote Spectroscopy

Новые объекты в океане, подводные газовые факелы (ГФ), образованные газовыми пузырьками, выходящими из дна моря, повсеместно встречаются в районах выброса газов как из толщи донных осадков в различных районах океана, так и в районах выгрузки газа при таянии вечной мерзлоты в арктических морях, и к ним проявляется все больше внимания. Стандартное применение рассеяния звука позволяет обнаружить наличие ГФ в море, но не позволяет в полной мере корректно оценить функцию распределения пузырьков по размерам в факеле и поэтому возникают неопределенности с оценкой мощности выброса газов из моря. Обсуждаются возможности использования метода нестационарного и нелинейного рассеяния звука для получения информации о структуре и динамике подводных газовых факелов, образованных выходом газа из морского дна. Нелинейное рассеяние звука обусловлено высокой нелинейностью пузырьковых структур в воде. Нестационарное рассеяние звука возникает вследствие переходных процессов раскачки пузырьков под действием акустических импульсов, и оно ранее использовалось для изучения распределения пузырьков в приповерхностных слоях морской воды. В работе показано, что применение нелинейного нестационарного рассеяния на встречных пучках позволит проводить дистанционную спектроскопию пузырьков в газовых факелах и проводить корректные оценки газосодержания в факелах. New objects in the ocean, underwater gas flares (GF) formed by gas bubbles emerging from the sea floor, are ubiquitous in areas where gases are released from the bottom sediments in various areas of the ocean, and in areas where gas is discharged during permafrost melting in the Arctic seas, and they are receiving increasing attention. The standard application of sound scattering allows detecting the presence of GF in the sea, but does not allow us to fully correctly estimate the bubble size distribution function in the flare, and therefore there are uncertainties with the estimation of the power of gas emission from the sea. The possibilities of using the method of non-stationary and nonlinear sound scattering to obtain information about the structure and dynamics of underwater gas flares formed by gas escaping from the sea floor are discussed. Nonlinear sound scattering is caused by the high nonlinearity of bubble structures in water. Non-stationary sound scattering occurs due to transient processes of bubble swinging under the action of acoustic pulses, and it was previously used to study the distribution of bubbles in near-surface layers of seawater. It is shown that the use of nonlinear non-stationary scattering on colliding beams will allow remote spectroscopy of bubbles in gas flares and correct estimates of the gas content in the flares.

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