Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves
Fluctuations of sound intensity in the presence of moving nonlinear internal waves (NIWs) are studied. Prior works revealed the existence of peaks in the spectrum of these fluctuations due to mode coupling. In the given paper, the results of experiment ASIAEX 2001 are considered. Episodes are analyz...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-01-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/10/1/119 |
| _version_ | 1797492902101778432 |
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| author | Yanyu Jiang Valery Grigorev Boris Katsnelson |
| author_facet | Yanyu Jiang Valery Grigorev Boris Katsnelson |
| author_sort | Yanyu Jiang |
| collection | DOAJ |
| description | Fluctuations of sound intensity in the presence of moving nonlinear internal waves (NIWs) are studied. Prior works revealed the existence of peaks in the spectrum of these fluctuations due to mode coupling. In the given paper, the results of experiment ASIAEX 2001 are considered. Episodes are analyzed when soliton-like NIW move for ~6 h approximately along an acoustic track of length ~30 km. The depth of the ocean changes from ~350 m (position of the source) up to ~120 m near the receiver (Vertical Line Array). The source, placed near the bottom, transmitted pulses (M-sequences) with a frequency of 224 Hz. Theoretical analysis and numerical modeling show that peak frequencies in the spectrum of intensity fluctuations correspond to the most strongly interacting pairs of modes: in the given case pairs 2–3 and 3–4 and values of dominating frequencies are determined by the spatial scale of interference beating Λ of coupling modes and by the speed <i>v</i> of NIW. Due to the fact that in the narrowing channel velocity <i>v</i> decreases as well as the value of Λ, the predominant frequency as a function of time remains approximately the same. Results of modeling are in a good agreement with experimental data. |
| first_indexed | 2024-03-10T01:11:21Z |
| format | Article |
| id | doaj.art-790d6b5c8ea24167b48dc0d9d4501285 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T01:11:21Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-790d6b5c8ea24167b48dc0d9d45012852023-11-23T14:17:19ZengMDPI AGJournal of Marine Science and Engineering2077-13122022-01-0110111910.3390/jmse10010119Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal WavesYanyu Jiang0Valery Grigorev1Boris Katsnelson2The Dr. Moses Strauss Department of Marine Geosciences, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 3498838, IsraelPhysics Department, Voronezh State University, Universitetskaya Square 1, 394006 Voronezh, RussiaThe Dr. Moses Strauss Department of Marine Geosciences, Leon H. Charney School of Marine Sciences, University of Haifa, Haifa 3498838, IsraelFluctuations of sound intensity in the presence of moving nonlinear internal waves (NIWs) are studied. Prior works revealed the existence of peaks in the spectrum of these fluctuations due to mode coupling. In the given paper, the results of experiment ASIAEX 2001 are considered. Episodes are analyzed when soliton-like NIW move for ~6 h approximately along an acoustic track of length ~30 km. The depth of the ocean changes from ~350 m (position of the source) up to ~120 m near the receiver (Vertical Line Array). The source, placed near the bottom, transmitted pulses (M-sequences) with a frequency of 224 Hz. Theoretical analysis and numerical modeling show that peak frequencies in the spectrum of intensity fluctuations correspond to the most strongly interacting pairs of modes: in the given case pairs 2–3 and 3–4 and values of dominating frequencies are determined by the spatial scale of interference beating Λ of coupling modes and by the speed <i>v</i> of NIW. Due to the fact that in the narrowing channel velocity <i>v</i> decreases as well as the value of Λ, the predominant frequency as a function of time remains approximately the same. Results of modeling are in a good agreement with experimental data.https://www.mdpi.com/2077-1312/10/1/119nonlinear internal wavesshallow watersound propagation |
| spellingShingle | Yanyu Jiang Valery Grigorev Boris Katsnelson Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves Journal of Marine Science and Engineering nonlinear internal waves shallow water sound propagation |
| title | Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves |
| title_full | Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves |
| title_fullStr | Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves |
| title_full_unstemmed | Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves |
| title_short | Sound Field Fluctuations in Shallow Water in the Presence of Moving Nonlinear Internal Waves |
| title_sort | sound field fluctuations in shallow water in the presence of moving nonlinear internal waves |
| topic | nonlinear internal waves shallow water sound propagation |
| url | https://www.mdpi.com/2077-1312/10/1/119 |
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