Acoustic shadowing by an isolated seamount

Chapman, N. Ross; Ebbeson, Gordon R.

doi:10.1121/1.389562

Cited by 15 publications

(7 citation statements)

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“…Both forward and backscattering for a seamount have been studied by several investigators theoretically and experimentally including models usually with SUS, or explosive sources or piezoelectric ones for the models. [1,2,3,4,5,6] BASSEX was unique since it uses modulated signals as well as an array which permitted pulse compression for high resolution of arrival times and a array for the multipath. In addition, the array has the ability to resolve the direction of arrival which is roughly 2 degrees at broadside and 15 at endfire.…”

Section: Long Term Goalsmentioning

confidence: 99%

NPAL Acoustic Noise Field Coherence and Broadband Full Field Processing

Baggeroer

Schmidt

Scheer

2007

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Section: Long Term Goalsmentioning

confidence: 99%

NPAL Acoustic Noise Field Coherence and Broadband Full Field Processing

Baggeroer

Schmidt

Scheer

2007

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“…Since the effects of seamounts are complex and the efficiency of numerical methods is usually low, previous studies on the sound propagation of seamounts mostly used 2D or N×2D models. With the deepening of ocean acoustics research, the focus gradually shifted to research about the 3D sound propagation phenomena of seamounts [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The experiments were carried out near Dickins Seamount in the northeast Pacific Ocean in 1975 [4,5] using explosive shots and CW sources. The results showed that the TL increased up to about 15 dB because the deep refracted waves would be blocked by the seamount, and the shadowing loss behind seamount was an f 1/2 dependence at frequencies greater than 50 Hz.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Sound Propagation in the South China Sea with the Presence of Seamount

Sheng-Hao

et al. 2021

JMSE

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Seamounts have important effects on sound propagation in deep water. A sound propagation experiment was conducted in the South China Sea in 2016. The three-dimensional (3D) effects of a seamount on sound propagation are observed in different propagation tracks. Ray methods (BELLHOP N×2D and 3D models) are used to analyze and explain the phenomena. The results show that 3D effects have obvious impacts on a sound field within a horizontal refraction zone behind the seamount because some sound beams cannot reach the receiver for the horizontal refraction effects, which impacts the sound field within a certain angle range behind the seamount. The arrival structure results show that the eigenrays after horizontal reflection will arrive at the receiver earlier than those obtained from the two-dimensional (2D) model within the horizontal refraction zone behind the seamount. This means that the horizontal reflection effect of a seamount will cause the shortening of sound propagation paths. Finally, in the reflection zone in front of the seamount, the 2D and 3D TL results show that the shape of the reflection zone is similar to an “arch” type, and the horizontal refraction of sound waves has little effect on the TLs in the reflection zone of a seamount.

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“…The experiment showed that the peak pressure levels recorded at Wake were as much as 35 dB below those at Midway and the spectral energy density ratio between Wake and Midway was frequently independent. Another experiment was carried out over the Dickins Seamount in the northeast Pacific ocean in 1975 [6,7] by using both explosive shots and CW sources. The results showed that the increased TL was up to 15 dB for the shallow source in which all deep refracted waves could be blocked by the seamount and the shadowing loss behind the seamount was an 𝑓 1/2 dependence at frequencies larger than 50 Hz.…”

mentioning

confidence: 99%

The Effects of Seamounts on Sound Propagation in Deep Water

Liu¹,

Li²,

Zhang³

et al. 2015

Chinese Phys. Lett.

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A propagation experiment was conducted in the South China Sea in 2014 with a flat bottom and seamounts respectively by using explosive sources. The effects of seamounts on sound propagation are analyzed by using the broadband signals. It is observed that the transmission loss (TL) decreases up to 7 dB for the signals in the first shadow zone due to the seamount reflection. Moreover, the TL might increase more than 30 dB in the converge zone due to the shadowing by seamounts. Abnormal TLs and pulse arrival structures at different ranges are explained by using the ray and wave theory. The experimental TLs and arrival pulses are compared with the numerical results and found to be in good agreement.

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Acoustic shadowing by an isolated seamount

Cited by 15 publications

References 0 publications

NPAL Acoustic Noise Field Coherence and Broadband Full Field Processing

NPAL Acoustic Noise Field Coherence and Broadband Full Field Processing

Three-Dimensional Sound Propagation in the South China Sea with the Presence of Seamount

The Effects of Seamounts on Sound Propagation in Deep Water

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