A MATHEMATICAL MODEL FOR THE EFFECTS OF INTERNAL WAVES ON PROPAGATION BEHAVIOR OF SOUND IN THE SEA

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MOHSENI ARASTEH AFSHIN; CHEGINI VAHID; GHAZI MIRSAEED MOJGAN

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Journal: JOURNAL OF MARINE SCIENCES AND TECHNOLOGY Year:2011 | Volume:9 | Issue:4 Page(s): 92-103

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Title

A MATHEMATICAL MODEL FOR THE EFFECTS OF INTERNAL WAVES ON PROPAGATION BEHAVIOR OF SOUND IN THE SEA

Author(s)

MOHSENI ARASTEH AFSHIN | CHEGINI VAHID | GHAZI MIRSAEED MOJGAN | Issue Writer Certificate

Keywords

INTERNAL WAVESQ3

SOUNDQ3

BUOYANCY FREQUENCYQ3

Abstract

The internal wave’s generation process and SOUND propagation mechanism have been studied, separately. However, the effects of INTERNAL WAVES on SOUND waves behavior are a study field that has not received any attention in our country. Marine environments are generally density stratified continuously or step-like. Layered structures of oceans affect SOUND propagation. Taking into consideration that some Iranian waters are density stratified and also have some INTERNAL WAVES that can be used in a SOUND propagation process for many purposes, it is necessary to study INTERNAL WAVES and SOUND transmission interaction. This paper attempts to discuss the effects of INTERNAL WAVES on underwater SOUND propagation using a mathematical model and find out how these processes are inter dependent. The parameters such as SOUND speed, BUOYANCY FREQUENCY, displacement variance, relative perturbations in SOUND propagation associated with vertical displacement and horizontal particle velocity, phase & amplitude function, INTERNAL WAVES phase & amplitude spectrum were computed using Caspian sea data. The parabolic approximation was applied in the wave equation to calculate amplitude spectrum density and phase fluctuations of a plane SOUND wave propagating through a random field of INTERNAL WAVES in the sea.The rate of SOUND propagation perturbations due to vertical displacement and particle horizontal velocity shows that horizontal displacement is much lower than vertical one. We found out that wave number and vertical displacement increase with increasing depth and decreasing BUOYANCY FREQUENCY. A maximum in BUOYANCY FREQUENCY and SOUND propagation fluctuations in associate with vertical displacement is observed near water surface which is due to thermocline and there is a minimum in vertical displacement at same place.

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APA: Copy

MOHSENI ARASTEH, AFSHIN, CHEGINI, VAHID, & GHAZI MIRSAEED, MOJGAN. (2011). A MATHEMATICAL MODEL FOR THE EFFECTS OF INTERNAL WAVES ON PROPAGATION BEHAVIOR OF SOUND IN THE SEA. JOURNAL OF MARINE SCIENCES AND TECHNOLOGY, 9(4), 92-103. SID. https://sid.ir/paper/74556/en

Vancouver: Copy

MOHSENI ARASTEH AFSHIN, CHEGINI VAHID, GHAZI MIRSAEED MOJGAN. A MATHEMATICAL MODEL FOR THE EFFECTS OF INTERNAL WAVES ON PROPAGATION BEHAVIOR OF SOUND IN THE SEA. JOURNAL OF MARINE SCIENCES AND TECHNOLOGY[Internet]. 2011;9(4):92-103. Available from: https://sid.ir/paper/74556/en

IEEE: Copy

AFSHIN MOHSENI ARASTEH, VAHID CHEGINI, and MOJGAN GHAZI MIRSAEED, “A MATHEMATICAL MODEL FOR THE EFFECTS OF INTERNAL WAVES ON PROPAGATION BEHAVIOR OF SOUND IN THE SEA,” JOURNAL OF MARINE SCIENCES AND TECHNOLOGY, vol. 9, no. 4, pp. 92–103, 2011, [Online]. Available: https://sid.ir/paper/74556/en

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