Far Eastern Mathematical Journal

To content of the issue


Laws of weakening infrasonic signals from the directed sources in the shallow sea


Kuznetsov G. N., Stepanov A. N.

2013, issue 1, Ñ. 61-71


Abstract
In the development of the fundamental idea of the professor G. I. Bykovtsev, who proposed to replace the field of the complex three-dimensional spatially developed moving source with the field of equivalent multipole emitter, the possibility of the simplified description of the laws of attenuation of the infrasonic signals from these sources is investigated. In connection with Pekeris’s waveguide we obtain the analytical dependences, which characterize the attenuation of the signal at the distances up to 100 km and more. Formulas are obtained for different types of multipoles and different distance intervals to the source. It is shown that these dependences give the sufficiently precise description of the averaged field and differ essentially for the horizontally and vertically oriented multipoles. The approximating relationships, which determine decay laws for the small, medium and great distances considering the influence of the horizons of detection and emission, sound frequency, depth and characteristics of the bottom of waveguide.

Keywords:
the given noisiness, multipoles, the laws of attenuation of the regular component, the influence of the horizons of emission and detection, the influence of distance

Download the article (PDF-file)

References

[1] L. M. Brekhovskikh, Volny v sloistykh sredakh, Izd-vo AN SSSR, Moskva, 1957.
[2] G. A. Grachev, “Osobennosti zatukhaniia signalov v melkom more”, Akust. zhurn., 29:2 (1983), 275–277.
[3] I. V. Gindler, V. G. Petnikov, “Zatukhanie zvuka v mnogoluchevom volnovode pri razlichnykh gorizontakh izlucheniia i priema”, Akust. zhurn., 33:2 (1987), 355–356.
[4] A. N. Stepanov, “O nekotorykh osobennostiakh zatukhaniia signalov v melkom more”, Akust. zhurn., 42:3 (1996), 446–447.
[5] A. N. Stepanov, “O zatukhanii signalov napravlennykh izluchatelei v melkom more”, Akust. zhurn., 42:4 (1996), 583–584.
[6] G. N. Kuznetsov, A. N. Stepanov, “Zavisimost' zvukovogo polia mul'tipol'nogo izluchatelia ot rasstoianiia v volnovode”, XI shkola-seminar akad. L.M. Brekhovskikh ”Akustika okeana”. XVII ses-siia RAO., 2006, 110–114.
[7] Robert Dzh. Urik, Osnovy gidroakustiki, Sudostroenie, Leningrad, 1978.
[8] G. I. Bykovtsev, G. N. Kuznetsov, A. N. Stepanov, “Akusticheskoe pole napravlennogo istochnika v okeanicheskikh volnovodakh”, DAN SSSR, 280:1 (1985), 57–59.
[9] G. I. Bykovtsev, G. N. Kuznetsov, A. N. Stepanov, “Gidroakusticheskii istochnik s napravlennym izlucheniem v melkom more”, Nauchno-tekhnicheskii sbornik "Voprosy sudostroeniia"seriia Akustika, 18 (1984), 86–89.
[10] A. N. Stepanov, Mul'tipol'naia model' gidroakusticheskikh istochnikov, Samarskii universitet, Samara, 2000.
[11] G. N. Kuznetsov, A. N. Stepanov, “Pole ekvivalentnogo mul'tipol'nogo sostavnogo izluchatelia v volnovode”, Akust. zhurn., 53:3 (2007), 377–385.

To content of the issue