1. Director, Marine Information Field, Port and Airport Research Institute, 3-1-1, Nagase, Yokosuka, Kanagawa 239-0826, Japan (corresponding author).
2. Technical Officer, Tohoku Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, 1-1-20, Kakyoin, Aoba-ku, Sendai, Miyagi 980-0013, Japan; formerly, Researcher, Marine Information Group, Marine Information Field, Port and Airport Research Institute, 3-1-1, Nagase, Yokosuka, Kanagawa 239-0826, Japan.
3. Head, Marine Information Group, Marine Information Field, Port and Airport Research Institute, 3-1-1, Nagase, Yokosuka, Kanagawa 239-0826, Japan.
4. Researcher, Marine Information Group, Marine Information Field, Port and Airport Research Institute, 3-1-1, Nagase, Yokosuka, Kanagawa 239-0826, Japan.