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




Associate Editor
Prof. Tomasz Neumann

Published by
TransNav, Faculty of Navigation
Gdynia Maritime University
3, John Paul II Avenue
81-345 Gdynia, POLAND
Towards Safer Navigation of Hydrofoils: Avoiding Sudden Collisions with Cetaceans
1 Tokyo University of Marine Science and Technology, Tokyo, Japan
2 Kawasaki Heavy Industries, Limited, Kobe, Japan
3 Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan
ABSTRACT: Recently, sudden collisions between large cetaceans and high-speed hydrofoils have become problematic to Japanese sea transport in some localities. We therefore initiated a project to investigate approaches for minimizing risk to both ships and cetaceans. Under the present project, the following three subprojects are underway: clarifying which whale species are found near sea routes and determining their seasonal variations; identifying whale species that have a high collision risk; and determining the unique acoustic characteristics of high-collision-risk cetaceans for the improvement of underwater speakers (UWS). By conducting acoustic surveys using novel methods, including an anatomical approach based on characteristics of the inner ear, the aim of this project is to accurately estimate the audible range of species with a high collision risk and improve the sounds generated by the UWS. Thus far, we have identified the cetacean species at high-risk in two major sea routes. In the next phase of the study we plan to develop an imaging system that recognizes a cetacean's unique blow using an infrared camera, in an attempt to warn of the approach of high-collision-risk whale species at an early stage by sounding an alarm.
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Backus, R. and W.E. Schevill. 1966. Physeter clicks, in Whales, Porpoises and Dolphins. In K. S. Norris (ed.) Whales, dolphins, and porpoises. : 510-528. California: Berkeley.
Kato, H. 2009. Towards Avoiding Collisions between Super High-speed Vessels and Whales. The Ship & Ocean Newsletter.217:4-5.
Odagawa, A. 2007. Fundamental research of collision avoidance between cetaceans and super high-speed vessels. Master Thesis, Tokyo University of Marine Science and Technology :1-105.
Shakata, K. 2009. Fundamental research of collision avoidance between cetaceans and super high speed vessels - Analysis for the occurrence of cetaceans on the sea routes and increase in precision of cetacean identification by the introduction of video camera research-. Master thesis, Tokyo University of Marine Science and Technology :1-90.
Yamada, H., L. Kagami, Y. Yonehara, H. Matsunaga, M. Terada, K. Okanoya, T. Kawamoto & H. Kato. 2011. Estimated audible range of large cetacean for improvement of the Under Water Speaker. The TransNav2011 monographs.
Citation note:
Kato H., Yamada H., Shakata K., Odagawa A., Kagami L., Yonehara Y., Terada M., Sakuma K., Mori H., Tanaka I., Sugioka H., Kyo M.: Towards Safer Navigation of Hydrofoils: Avoiding Sudden Collisions with Cetaceans. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 6, No. 1, pp. 143-147, 2012

Other publications of authors:

H. Yamada, L. Kagami, Y. Yonehara, H. Matsunaga, H. Kato, M. Terada, R. Takahashi, K. Okanoya, T. Kawamoto
T. Nakashima, N. Kobayashi, H. Yamada, T. Katsumata, R. Yoshida, H. Kato, H. Okabe, I. Kawazu, Y. Yanase, M. Omine, M. Terada, H. Sugioka, M. Kyo

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