Short range propagation through an inhomogeneous medium

Nicholas G Pace; William J Wood; C M A Jones

doi:10.1109/OCEANS.1994.364192

Short range propagation through an inhomogeneous medium

Nicholas G Pace, William J Wood, C M A Jones

Research output: Chapter or section in a book/report/conference proceeding › Book chapter

Abstract

Inhomogeneity is a characteristic of every real medium, and two types are observed, regular and random. Regular inhomogeneities are produced by spatial variation of the mean characteristics of a medium, for example, velocity variation with temperature, depth and salinity. Random inhomogeneities are produced by deviation from the mean values. In the paper a medium with random inhomogeneities is modelled and ray diagrams illustrate the effect of the magnitude and scale size of the inhomogeneities on the propagation of sound. The sound speed of the medium varies with both range and depth and thus may be described by correlation lengths in both dimensions. The results' presented relate to an existing extreme experimental situation where the propagation range is 170 m with horizontal correlation length of 20 m, vertical correlation length 2 m, and a standard deviation of the local sound speed from the local mean of 0.5 m/s. The modelling results are compared with experimental results.

Original language	English
Title of host publication	Proceedings of OCEANS'94: Oceans Engineering for Today's Technology and Tomorrow's Preservation
Publisher	IEEE
Pages	III/172-III/177
Volume	3
ISBN (Print)	0780320565
DOIs	https://doi.org/10.1109/OCEANS.1994.364192
Publication status	Published - 1994

Bibliographical note

OCEANS'94: Oceans Engineering for Today's Technology and Tomorrow's Preservation. 13-16 September 1994. Brest, France.

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10.1109/OCEANS.1994.364192

Cite this

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title = "Short range propagation through an inhomogeneous medium",

abstract = "Inhomogeneity is a characteristic of every real medium, and two types are observed, regular and random. Regular inhomogeneities are produced by spatial variation of the mean characteristics of a medium, for example, velocity variation with temperature, depth and salinity. Random inhomogeneities are produced by deviation from the mean values. In the paper a medium with random inhomogeneities is modelled and ray diagrams illustrate the effect of the magnitude and scale size of the inhomogeneities on the propagation of sound. The sound speed of the medium varies with both range and depth and thus may be described by correlation lengths in both dimensions. The results' presented relate to an existing extreme experimental situation where the propagation range is 170 m with horizontal correlation length of 20 m, vertical correlation length 2 m, and a standard deviation of the local sound speed from the local mean of 0.5 m/s. The modelling results are compared with experimental results.",

author = "Pace, {Nicholas G} and Wood, {William J} and Jones, {C M A}",

note = "OCEANS'94: Oceans Engineering for Today's Technology and Tomorrow's Preservation. 13-16 September 1994. Brest, France.",

year = "1994",

doi = "10.1109/OCEANS.1994.364192",

language = "English",

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TY - CHAP

T1 - Short range propagation through an inhomogeneous medium

AU - Pace, Nicholas G

AU - Wood, William J

AU - Jones, C M A

N1 - OCEANS'94: Oceans Engineering for Today's Technology and Tomorrow's Preservation. 13-16 September 1994. Brest, France.

PY - 1994

Y1 - 1994

N2 - Inhomogeneity is a characteristic of every real medium, and two types are observed, regular and random. Regular inhomogeneities are produced by spatial variation of the mean characteristics of a medium, for example, velocity variation with temperature, depth and salinity. Random inhomogeneities are produced by deviation from the mean values. In the paper a medium with random inhomogeneities is modelled and ray diagrams illustrate the effect of the magnitude and scale size of the inhomogeneities on the propagation of sound. The sound speed of the medium varies with both range and depth and thus may be described by correlation lengths in both dimensions. The results' presented relate to an existing extreme experimental situation where the propagation range is 170 m with horizontal correlation length of 20 m, vertical correlation length 2 m, and a standard deviation of the local sound speed from the local mean of 0.5 m/s. The modelling results are compared with experimental results.

AB - Inhomogeneity is a characteristic of every real medium, and two types are observed, regular and random. Regular inhomogeneities are produced by spatial variation of the mean characteristics of a medium, for example, velocity variation with temperature, depth and salinity. Random inhomogeneities are produced by deviation from the mean values. In the paper a medium with random inhomogeneities is modelled and ray diagrams illustrate the effect of the magnitude and scale size of the inhomogeneities on the propagation of sound. The sound speed of the medium varies with both range and depth and thus may be described by correlation lengths in both dimensions. The results' presented relate to an existing extreme experimental situation where the propagation range is 170 m with horizontal correlation length of 20 m, vertical correlation length 2 m, and a standard deviation of the local sound speed from the local mean of 0.5 m/s. The modelling results are compared with experimental results.

UR - http://dx.doi.org/10.1109/OCEANS.1994.364192

U2 - 10.1109/OCEANS.1994.364192

DO - 10.1109/OCEANS.1994.364192

M3 - Book chapter

SN - 0780320565

VL - 3

SP - III/172-III/177

BT - Proceedings of OCEANS'94: Oceans Engineering for Today's Technology and Tomorrow's Preservation

PB - IEEE

ER -

Short range propagation through an inhomogeneous medium

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