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ISSN 2083-6473
ISSN 2083-6481 (electronic version)
 

 

 

Editor-in-Chief

Associate Editor
Tomasz Neumann
 

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
www http://www.transnav.eu
e-mail transnav@am.gdynia.pl
Repellence Effect of the New Sound for Underwater Speaker of Hydrofoil
1 Tokyo University of Marine Science and Technology, Tokyo, Japan
2 Okinawa Churashima Foundation, Okinawa, Japan
3 Kawasaki Heavy Industries, Limited, Kobe, Japan
4 Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
ABSTRACT: In order to prevent hydrofoil colliding with cetaceans, the underwater speaker (UWS) has been installed to repel cetaceans. Yamada et al. (2012) analyzed and devised the UWS sound as it fits the cetaceans' acoustic properties to prevent the collision furthermore. The new UWS sound was devised and synthesized by Yamada et al. (2015) with expectation of avoiding collision with large cetaceans (Patent applied for, JP2014-171411). In this research project, the new UWS sound was investigated by the playback experiment on humpback whale (Megaptera novaeangliae) and by sighting survey in the actual hydrofoil shipping service route. As a result, a physiological and behavioral change of the humpback whale was observed in the playback experiment of the new UWS sound, and the chance of hydrofoil encountering cetaceans of the new UWS sound was smaller than that of the previous UWS sound. Therefore, the improvement of the new UWS sound was confirmed. Lastly, we wish this research project would contribute toward the safer cruise of hydrofoil in the future.
REFERENCES
Laist, D. W., Knowlton, A. R., Mead, J. G., Collet, A. S. and Podesta, M. (2001), COLLISIONS BETWEEN SHIPS AND WHALES. Marine Mammal Science, 17: 35–75. doi: 10.1111/j.1748-7692.2001.tb00980.x
Citation note:
Nakashima T., Kobayashi N., Yamada H., Katsumata T., Yoshida R., Kato H., Okabe H., Kawazu I., Yanase Y., Omine M., Terada M., Sugioka H., Kyo M.: Repellence Effect of the New Sound for Underwater Speaker of Hydrofoil. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 9, No. 2, doi:10.12716/1001.09.02.07, pp. 207-211, 2015

Other publications of authors:

H. Kato, H. Yamada, K. Shakata, A. Odagawa, L. Kagami, Y. Yonehara, M. Terada, K. Sakuma, H. Mori, I. Tanaka, H. Sugioka, M. Kyo
H. Yamada, L. Kagami, Y. Yonehara, H. Matsunaga, H. Kato, M. Terada, R. Takahashi, K. Okanoya, T. Kawamoto

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