1. Graduate School of Science and Engineering, Kagoshima University , 1-21-40 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
2. Department of Urban Engineering, Kobe City College of Technology , 8–3 Gakuenhigashi-cho, Nishi-ku, Kobe, Hyogo 651-2194, Japan
3. Disaster Prevention Research Institute, Kyoto University , Gokasho, Uji, Kyoto 611-0011, Japan
4. Coastal Operation Division, Idea Consultants, Inc. , 2-2-2 Hayabuchi, Tsuzuki-ku, Yokohama, Kanagawa 224-0025, Japan