The Journal of the Marine Acoustics Society of Japan
Online ISSN : 1881-6819
Print ISSN : 0916-5835
ISSN-L : 0916-5835
Volume 49, Issue 1
Displaying 1-1 of 1 articles from this issue
Translated Paper
  • Yukino HIRAI, Toshio TSUCHIYA, Etsuro SHIMIZU
    2022 Volume 49 Issue 1 Pages 1-10
    Published: January 01, 2022
    Released on J-STAGE: July 02, 2022

    Recently, there has been a worldwide movement toward the reduction of underwater noise from shipping. In Japan, research has been conducted on the behavioral reaction of whales when exposed to underwater noise from shipping in the sea around the Ogasawara islands. In shallow water such as that sea, sound propagation is affected by environmental parameters of the path between the sound source and receiver. Additionally the sound source and receiver both move continuously. Therefore, it is impossible to estimate an accurate SEL (sound exposure level) for the receiver with the commonly used equation of spherical spreading loss. The objective of our research is to examine the estimation method for accurate SEL, taking into account the influence on sound propagation of environmental parameters and movement of the sound source and receiver. We simulated the sound field at every two minutes within a circle area of the sea when a ship was navigating, and made a SEL map that integrated these sound fields. In addition, we compared the SEL maps based on the simulation and on the equation of spherical spreading loss. Finally, we illustrated the differences in SEL estimated by the two maps.

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