The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf)
It is essential for oceanographers to study the effects of marine phenomena such as currents, surface mixed layer, eddies, internal waves, and other ocean features on acoustic propagation, as most marine measurement equipment operates on this basis, like sonar. The eddy impact on acoustic transmissi...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute of Fundamental Technological Research
2022-09-01
|
| Series: | Archives of Acoustics |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/124251/PDF/aoa.2022.142015.pdf |
| _version_ | 1827988854504685568 |
|---|---|
| author | Omid Mahpeykar Amir Ashtari Larki Mohammad Akbari Nasab |
| author_facet | Omid Mahpeykar Amir Ashtari Larki Mohammad Akbari Nasab |
| author_sort | Omid Mahpeykar |
| collection | DOAJ |
| description | It is essential for oceanographers to study the effects of marine phenomena such as currents, surface mixed layer, eddies, internal waves, and other ocean features on acoustic propagation, as most marine measurement equipment operates on this basis, like sonar. The eddy impact on acoustic transmission in the marine environment is very significant because changes in temperature and salinity disrupt the sound speed due to the presence of eddy, thus the acoustic propagation in the sea. Although cold eddies are in the Persian Gulf widely, one eddy is selected to study their impacts on acoustic propagation because they have similar properties in terms of temperature and salinity. In this research, after identifying eddies in the Persian Gulf automatically, the effect of a cold eddy on acoustic propagation was investigated at different depths using the BELLHOP model. Most eddies are cyclonic with 5–10 km of radius based on algorithm outputs. Studies on the lifespan of eddies showed that the occurrence of cyclonic eddies with a lifespan of more than three days is more than anticyclonic ones. Examination of the eddy effect on acoustic propagation showed that the transmission loss (TL) during the progress of the acoustic wave across the eddy increases with increasing the depth of the sound source. Also, the presence of cold eddy compared to the conditions it does not exist increases the transmission loss. The study of three-dimensional acoustic propagation also confirmed the obtained results in two-dimensional mode and clearly showed the role of cold eddy in increasing the TL. |
| first_indexed | 2024-04-10T00:09:59Z |
| format | Article |
| id | doaj.art-75c9c55fefd24857afd28e59083394f6 |
| institution | Directory Open Access Journal |
| issn | 0137-5075 2300-262X |
| language | English |
| last_indexed | 2024-04-10T00:09:59Z |
| publishDate | 2022-09-01 |
| publisher | Institute of Fundamental Technological Research |
| record_format | Article |
| series | Archives of Acoustics |
| spelling | doaj.art-75c9c55fefd24857afd28e59083394f62023-03-16T12:10:43ZengInstitute of Fundamental Technological ResearchArchives of Acoustics0137-50752300-262X2022-09-01vol. 47No 3413423https://doi.org/10.24425/aoa.2022.142015The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf)Omid Mahpeykar0Amir Ashtari Larki1Mohammad Akbari Nasab2Department of Physical Oceanography, Faculty of Marine Science and Oceanography, Khorramshahr University of Marine Science and Technology, Khorramshahr, IranDepartment of Physical Oceanography, Faculty of Marine Science and Oceanography, Khorramshahr University of Marine Science and Technology, Khorramshahr, IranDepartment of Marine Physics, Faculty of Marine and Oceanic Sciences, University of Mazandaran, Babolsar, IranIt is essential for oceanographers to study the effects of marine phenomena such as currents, surface mixed layer, eddies, internal waves, and other ocean features on acoustic propagation, as most marine measurement equipment operates on this basis, like sonar. The eddy impact on acoustic transmission in the marine environment is very significant because changes in temperature and salinity disrupt the sound speed due to the presence of eddy, thus the acoustic propagation in the sea. Although cold eddies are in the Persian Gulf widely, one eddy is selected to study their impacts on acoustic propagation because they have similar properties in terms of temperature and salinity. In this research, after identifying eddies in the Persian Gulf automatically, the effect of a cold eddy on acoustic propagation was investigated at different depths using the BELLHOP model. Most eddies are cyclonic with 5–10 km of radius based on algorithm outputs. Studies on the lifespan of eddies showed that the occurrence of cyclonic eddies with a lifespan of more than three days is more than anticyclonic ones. Examination of the eddy effect on acoustic propagation showed that the transmission loss (TL) during the progress of the acoustic wave across the eddy increases with increasing the depth of the sound source. Also, the presence of cold eddy compared to the conditions it does not exist increases the transmission loss. The study of three-dimensional acoustic propagation also confirmed the obtained results in two-dimensional mode and clearly showed the role of cold eddy in increasing the TL.https://journals.pan.pl/Content/124251/PDF/aoa.2022.142015.pdfpersian gulfcold eddytransmission loss (tl)acoustic propagationbellhop model |
| spellingShingle | Omid Mahpeykar Amir Ashtari Larki Mohammad Akbari Nasab The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) Archives of Acoustics persian gulf cold eddy transmission loss (tl) acoustic propagation bellhop model |
| title | The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) |
| title_full | The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) |
| title_fullStr | The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) |
| title_full_unstemmed | The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) |
| title_short | The Effect of Cold Eddy on Acoustic Propagation (Case Study: Eddy in the Persian Gulf) |
| title_sort | effect of cold eddy on acoustic propagation case study eddy in the persian gulf |
| topic | persian gulf cold eddy transmission loss (tl) acoustic propagation bellhop model |
| url | https://journals.pan.pl/Content/124251/PDF/aoa.2022.142015.pdf |
| work_keys_str_mv | AT omidmahpeykar theeffectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf AT amirashtarilarki theeffectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf AT mohammadakbarinasab theeffectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf AT omidmahpeykar effectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf AT amirashtarilarki effectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf AT mohammadakbarinasab effectofcoldeddyonacousticpropagationcasestudyeddyinthepersiangulf |