Abstract
3D sound propagation modeling in the context of acoustic noise monitoring problems is considered. A technique of effective source spectrum reconstruction from a reference single-hydrophone measurement is discussed, and the procedure of simulation of sound exposure level (SEL) distribution over a large sea area is described. The proposed technique is also used for the modeling of pulse signal waveforms at other receiver locations, and results of a direct comparison with the pulses observed in the experimental data is presented.
Highlights
The geoacoustic waveguide model used in the simulation of sound propagation along the acoustic path S-P1-P2 consists of two layers
This model is based on the estimates of the bottom parameters made during the previous work in this area, and we slightly adjusted it to the input format of the Ample and mode parabolic equations (MPE) programs used in the simulations
One recording unit deployed in the area of interest is used for reconstructing effective source spectrum, and the MPE theory is used for computing the field and sound exposure level (SEL) in the entire area
Summary
It is often desirable to conduct comprehensive monitoring of noise pollution of the sea area in real time in order to provide a possibility for prompt assessment of its impact on the marine fauna and for undertaking adequate noise mitigation measures in a timely manner [1] This challenge imposes severe restrictions on the performance of computational codes for sound propagation modelling. It is shown that in the considered example SEL computation performed using adiabatic pseudodifferential MPE [13] results in greater accuracy than computations involving coupled-mode narrow-angle MPEs [14] This conclusion is consistent with the results of previous work indicating that in typical shallow-water environments with smallangle bottom slope the angular aperture in the horizontal plane is more important than taking mode coupling effects into account.
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