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Vector ocean ambient noise spectrum simulation based on parabolic equation model in shallow water. (English) Zbl 1370.86003

Summary: Ocean ambient noise spectrum is one of the most important characteristics of ambient noise. An ocean vector ambient noise field model was built up based on parabolic equation in this paper. Then the spectra of sound pressure, horizontal particle velocity and vertical particle velocity were calculated applying the model considering noise sources well distributed on the surface with typical summer sound speed profile in South China Sea. The simulation results showed that spectra of sound pressure, horizontal particle velocity and vertical particle velocity were obviously not varied with depth. Then, the simulated results were compared with the experiment results at the receiving depth of a trail in South China Sea in July 2012. Compared with the experimental results, the simulation results are consistent well with the experimental one of sound pressure and horizontal particle velocity in the trend. But the simulation values at low frequency band below 500 Hz, are not consistent with the experimental one very well, in the band the simulation results are lower than the experimental by about 3–5 dB. But the simulation result of vertical particle velocity was not consistent with the experimental one, illustrating that the precision of the model might not be enough in the vertical direction.

MSC:

86-08 Computational methods for problems pertaining to geophysics
86A05 Hydrology, hydrography, oceanography
76Q05 Hydro- and aero-acoustics
76B15 Water waves, gravity waves; dispersion and scattering, nonlinear interaction

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References:

[1] Jensen, F. B., Kuperman, W. A., Porter, M. B. and Schmidt, H., Computational Ocean Acoustics (Springer, New York, 2011). · Zbl 1234.76003
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