Acoustics of Layered Media II

Brekhovskikh, Leonid M.; Godin, Oleg A.

doi:10.1007/978-3-662-02776-9

Cited by 101 publications

(76 citation statements)

References 39 publications

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“…In this case we have to consider propagation of waves with the length comparable to the depth of the sea, according to the theory elaborated for the shallow sea (Brekhovskikh et al, 1992). In such a situation, the transmission losses of waves with the length of λ that satisfy the condition:…”

Section: Measurements Methods and Resultsmentioning

confidence: 99%

Underwater Noise Generated by a Small Ship in the Shallow Sea

Grelowska¹,

Kozaczka²,

Kozaczka³

et al. 2013

Archives of Acoustics

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Study of the sea noise has been a subject of interest for many years. The first works in this scope were published at the turn of the twentieth century by Knudsen (Knudsen et al., 1948) and G. Wenz (Wenz, 1962). Disturbances called "shipping noise" are one of the important components of the sea noise.In this work the results of an experimental research of underwater noise produced by a small ship of a classic propulsion are presented. A linear receiving antenna composed of two orthogonal components was used in the investigation. Identification of the main sources of acoustic waves related with the ship was achieved. In addition, the intensity of the wave was measured. The research was performed in conditions of the shallow sea.

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Section: Measurements Methods and Resultsmentioning

confidence: 99%

Underwater Noise Generated by a Small Ship in the Shallow Sea

Grelowska¹,

Kozaczka²,

Kozaczka³

et al. 2013

Archives of Acoustics

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show abstract

“…Based on both the ray equation in Eq. (2-16) and the transport equation for the amplitude A,., the pressure field can be represented to the leading order as [61,67] -i!.…”

Section: Horizontal Ray Methodsmentioning

confidence: 99%

Analysis of modal evolution caused by a weakly range-dependent seabed in shallow water and its application to inversion for geoacoustic properties

Ohta¹

1993

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“…(3) becomes a reciprocity relation for the Green's matrix. The second term on the right-hand side vanishes due to the choice of the opposite flow velocities (flow-reversal theorem [24,31,32]). When we choose x A and x B both in D and assume that outside a sphere with finite radius the medium is homogeneous, isotropic and nonflowing, then the boundary integral vanishes as well.…”

Section: Dtmentioning

confidence: 99%

Unified Green’s Function Retrieval by Cross Correlation

2006

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It has been shown by many authors that the cross correlation of two recordings of a diffuse wave field at different receivers yields the Green's function between these receivers. Recently the theory has been extended for situations where time-reversal invariance does not hold (e.g., in attenuating media) and where source-receiver reciprocity breaks down (in moving fluids). Here we present a unified theory for Green's function retrieval that captures all these situations and, because of the unified form, readily extends to more complex situations, such as electrokinetic Green's function retrieval in poroelastic or piezoelectric media. The unified theory has a wide range of applications in ''remote sensing without a source.''

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Acoustics of Layered Media II

Cited by 101 publications

References 39 publications

Underwater Noise Generated by a Small Ship in the Shallow Sea

Underwater Noise Generated by a Small Ship in the Shallow Sea

Analysis of modal evolution caused by a weakly range-dependent seabed in shallow water and its application to inversion for geoacoustic properties

Unified Green’s Function Retrieval by Cross Correlation

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