Examination of the broadband low-frequency emitters in the study of temperature regimes in the Sea of Japan

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The use of technical means and methods of low-frequency hydroacoustics for monitoring the variability of average temperatures of underwater sound channels in the Sea of Japan is considered. A review of the characteristics of the line of powerful inter-piston hydroacoustic emitters developed by the Institute of Applied Physics of the Russian Academy of Sciences, developed by the Institute of Applied Physics of the Russian Academy of Sciences, is carried out, promising for organizing long acoustic routes. The results of measurements of the electroacoustic characteristics of low-frequency hydroacoustic emitters under natural conditions at depths of up to 150 m are presented, and the use of these emitters for studying the temperature regimes of associated underwater sound channels of the shelf and deep sea on multi-scale long routes in the Sea of Japan is also considered. Based on the processing of experimental data on an acoustic path with a length of about 1000 km, obtained in 2022, examples of the reconstruction of average water temperature values from data on the speed of sound along the acoustic path are given, the sensitivity of the method is assessed, and the signal-to-noise ratio values achieved in the experiment are analyzed.

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作者简介

B. Bogolyubov

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Ulyanova 46, Nizhny Novgorod, 603950

A. Britenkov

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Ulyanova 46, Nizhny Novgorod, 603950

D. Kasyanov

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Ulyanova 46, Nizhny Novgorod, 603950

V. Farfel

Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Ulyanova 46, Nizhny Novgorod, 603950

Yu. Morgunov

V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences (POI FEB RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Baltiyskaya Street 43, Vladivostok, 690041

V. Besotvetnykh

V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences (POI FEB RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Baltiyskaya Street 43, Vladivostok, 690041

E. Voitenko

V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences (POI FEB RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Baltiyskaya Street 43, Vladivostok, 690041

A. Golov

V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences (POI FEB RAS)

编辑信件的主要联系方式.
Email: golov_alexander@inbox.ru
俄罗斯联邦, Baltiyskaya Street 43, Vladivostok, 690041

A. Tagiltsev

V.I.Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences (POI FEB RAS)

Email: golov_alexander@inbox.ru
俄罗斯联邦, Baltiyskaya Street 43, Vladivostok, 690041

参考

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1. JATS XML
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2. Fig. 1. Design of a LF with a biconical radiating surface

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3. Rice. 2. Line of NFBs of the Beacon type: (a) - Beacon-1, (b) - Beacon-2, (c) - Beacon-3, (d) - Beacon-4

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4. Fig. 3. Characteristic dependence of the sound pressure developed by the Beacon-1 type LFPI

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5. Fig. 4. Characteristic dependence of sound pressure developed by the Beacon-2 type LFPI

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6. Fig. 5. Characteristic dependence of sound pressure developed by the Beacon-3 type LFPI

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7. Fig. 6. Characteristic dependence of sound pressure developed by the Beacon-4 type LFPI

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8. Fig. 7. NCHI with a rod with a control hydrophone installed on a support

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9. Fig. 8. Developed effective acoustic pressure (reduced to 1 m) of the LF located at a depth of 150 m. The inductance of the matching choke is 50 mH.

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10. Fig. 9. Scheme of the experiment on acoustic thermometry on the route from Chekhov village to Kito-Yamato bank

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11. Fig. 10. Autocorrelation functions of electronic masks of emitted signals

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12. Fig. 11. Typical impulse response of a set of emitted signals

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13. Fig. 12. Signal-to-noise ratio for a set of signals (a) of short duration (up to 13 s) and (b) of long duration (more than 30 s). Interruptions in equipment operation are indicated by arrows

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14. Fig. 13. Results of measuring the effective speed of sound and temperature on the PZK axis along the route. The dotted lines indicate the average values ​​of the quantities on the entire fragment.

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15. Fig. 14. Lagrangian map of trajectory lengths (in km) for 30 days based on AVISO velocity field data. Dark color corresponds to areas of active advection of water masses. Red and green triangles are the centers of anticyclones and cyclones, respectively. Orange crosses are hyperbolic points. Yellow line is the acoustic path.

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