A geoacoustic bottom interaction model (GABIM)

Jackson, Darrell R.; Odom, Robert I.; Boyd, Michael L.; Ivakin, Anatoliy N.

doi:10.1109/joe.2010.2050170

Cited by 51 publications

(33 citation statements)

References 40 publications

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“…For ocean sediments, the roughness spectra have been shown to obey power-law statistics rather than Gaussian [4]. An example is the power spectrum measured from a sandy sediment shown in Fig.…”

Section: A Rough Interface Characterizationmentioning

confidence: 99%

“…It is also interesting to look at the noncoherent bottom loss, calculated using the mean of the squared magnitude of the pressure in the specular direction (3) Another metric, useful for scattered angles other than specular, is the scattering strength. It is defined by (4) Here, is the angle of the scattered wave. For backscattering, .…”

Section: Scattering Modelsmentioning

confidence: 99%

“…A third, hybrid model, the small slope approximation, combines KA which is most accurate near the specular angle and PT which is more accurate away from specular [2]. Codes commonly available to calculate rough interface scattering include the GeoAcoustic Bottom Interaction Model (GABIM) which relies on KA and first-order PT models as well as an empirical model [4] and the BOttom Response from Inhomogeneities and Surface using Small Slope Approximation (BORIS-SSA) [5].…”

Section: Introductionmentioning

confidence: 99%

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Finite Element Modeling of Acoustic Scattering From Fluid and Elastic Rough Interfaces

Isakson

Chotiros

2015

IEEE J. Oceanic Eng.

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Quantifying acoustic scattering from rough interfaces is critical for reverberation modeling, acoustic sediment characterization, and propagation modeling. In this study, a finite element (FE) scattering model is developed. The model computes the plane wave scattering strength for an ensemble of rough power-law surfaces for ocean bottoms described as fluid and elastic. The FE model is compared with two models based on approximations to the Helmholtz-Kirchhoff integral: the Kirchhoff approximation (KA) and the perturbation theory (PT). In the case of a fluid-like bottom, the KA and FE models agree except at small grazing angles. The PT and FE models deviate near specular especially at small angles. For the elastic case, the PT predicts the FE results well except at the intromission angle of the shear wave. The KA deviates for angles that are below the critical angle of the compressional wave. At the shear wave intromission angle, the FE model shows a more plausible solution likely due to multiple scattering events that are not accounted for in PT for the modeled roughness.

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Section: A Rough Interface Characterizationmentioning

confidence: 99%

Section: Scattering Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Finite Element Modeling of Acoustic Scattering From Fluid and Elastic Rough Interfaces

Isakson

Chotiros

2015

IEEE J. Oceanic Eng.

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“…Since the frequencies of interest are above 10 kHz, the Geophysical-Acoustic Bottom Interaction Model (Jackson et al, 2010) is implemented with the parameters for bounding seabed types from the U.S. Navy's Bottom Sediment Type database (Jackson and Richardson, 2007). The resulting bottom scattering strength versus grazing angle for both bottom types is shown in Fig.…”

Section: E Bottom Reflectionmentioning

confidence: 99%

Plumbing the depths of Ligeia: Considerations for depth sounding in Titan's hydrocarbon seas

Arvelo

Lorenz

2013

The Journal of the Acoustical Society of America

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Saturn's moon Titan is the only satellite in this solar system with a dense atmosphere and hydrocarbon seas. The Titan Mare Explorer (TiME) mission would splashdown a capsule to float for 3 months on Ligeia Mare, a several-hundred-kilometer wide sea near Titan's north pole. Among TiME's scientific goals is the determination of the depth of Ligeia, to be achieved with an acoustic depth sounder. Since Titan's surface temperature is known to vary around 92 K, all instruments must be ruggedized to operate at cryogenic temperatures. This paper's contributions include an approach to infer key acoustic properties of this remote environment and the extraterrestrial environment's influence on the development of a cryogenic depth sounder. Additionally, an approach is formulated to infer the transducer's response, sensitivity, and performance when in situ calibration is impossible or when replicating key environmental conditions is too costly.

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“…So far, most investigations were performed to study backscattering caused by volume heterogeneities, 3,7,[9][10][11][12][13][14][15][25][26][27][28][29][30][31][32][33][34] for subcritical penetration. The aim of our paper is to analyze subcritical penetration caused by volume scattering.…”

Section: Introductionmentioning

confidence: 99%

Subcritical penetration of acoustic waves into inhomogenous seafloors

Peng

2012

The Journal of the Acoustical Society of America

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A generalized model is applied to estimate the incoherent penetration ratio caused by volume scattering at grazing angles below the critical grazing angle. The factors that affect volume scattering have been discussed using experimental data in literature. A two-layered model that refers to sound scattering in two-layered media is used to evaluate the incoherent penetration ratio for most typical sediments. But for special cases, such as the experiment, SAX04, a three-layered model is necessary to describe scattering features especially for grazing angles θ<30°. It is shown that subcritical penetration is enhanced when the scale of volume fluctuations is comparable with the acoustic wavelength, and the scattered waves into the seafloor dominate over evanescent waves at depths larger than a few wavelengths.

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A geoacoustic bottom interaction model (GABIM)

Cited by 51 publications

References 40 publications

Finite Element Modeling of Acoustic Scattering From Fluid and Elastic Rough Interfaces

Finite Element Modeling of Acoustic Scattering From Fluid and Elastic Rough Interfaces

Plumbing the depths of Ligeia: Considerations for depth sounding in Titan's hydrocarbon seas

Subcritical penetration of acoustic waves into inhomogenous seafloors

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