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2023 Journal Impact Factor - 0.7
2023 CiteScore - 1.4
ISSN 2083-6473
ISSN 2083-6481 (electronic version)
Editor-in-Chief
Associate Editor
Prof. Tomasz Neumann
Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
e-mail transnav@umg.edu.pl
Estimation on Audibility of Large Cetaceans for Improvement of the Under Water Speaker
1 Tokyo University of Marine Science and Technology, Tokyo, Japan
2 Kawasaki Heavy Industries, Limited, Kobe, Japan
3 RIKEN Brain Science Institute, Wako, Japan
4 Tsurumi University, Yokohama, Japan
2 Kawasaki Heavy Industries, Limited, Kobe, Japan
3 RIKEN Brain Science Institute, Wako, Japan
4 Tsurumi University, Yokohama, Japan
ABSTRACT: In order to avoid collisions between the hydrofoil (HF) and cetaceans, the Under Water Speaker (UWS) has been installed on the HF. Because of its potential in utility, we tried to improve the UWS to minimize the risk of the collisions. Under our project, we examined three subprojects; 1) Analyzing the characteristics of the HF underwater noise; 2) Assessing audibility of major large cetaceans by measuring their vocalizations and 3) An anatomical prediction of the audible range by examining the cochlear basal membrane. Through the analyses, it was identified that the noise produced by the HF was a broad-band noise with approximately 150dB re 1?Pa-m.That noise level was lower than those of larger boats suggesting difficulties for cetaceans in sensing approach of the vessels. In addition, analysis of their vocalizations and anatomical obervation indicated that dominant frequency of their audible range was lower than signals produced by the existing UWS.
KEYWORDS: Hydrofoils, Maritime Ecology, Large Cetaceans, Measuring of Vocalization, Underwater Noise, Whales, Maine Biology, Underwater Speaker (UWS)
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Citation note:
Yamada H., Kagami L., Yonehara Y., Matsunaga H., Kato H., Terada M., Takahashi R., Okanoya K., Kawamoto T.: Estimation on Audibility of Large Cetaceans for Improvement of the Under Water Speaker. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 6, No. 4, pp. 589-593, 2012
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