日本地球惑星科学連合2018年大会

講演情報

[JJ] ポスター発表

セッション記号 H (地球人間圏科学) » H-DS 防災地球科学

[H-DS10] 津波とその予測

2018年5月23日(水) 13:45 〜 15:15 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:山本 近貞 直孝(防災科学技術研究所)、今井 健太郎(国立研究開発法人 海洋研究開発機構)、対馬 弘晃(気象庁気象研究所)

[HDS10-P23] 南海トラフ地震発生時に船舶が阪神港で遭遇する津波

*林 美鶴1中田 聡史2見崎 豪之2岩川 正秀4越村 俊一3米田 翔太2小林 英一2 (1.神戸大学内海域環境教育研究センター、2.神戸大学大学院海事科学研究科、3.東北大学災害科学国際研究所、4.神戸大学海事科学部)

キーワード:津波、船舶、避難

Nakada et al. (2015) simulated the tsunami caused by the Nankai Trough Earthquake based on the case 3 fault model. Osaka Bay was divided into a 50 m grid horizontally in the model with one vertical dimension. And the flow speed and height of the tsunami was calculated for every 0.5 seconds from the earthquake occurrence to 600 minutes. Then the vorticity was calculated by the flow speed (Hayashi et al., 2016). Hanshin Port located in the inner part of Osaka Bay is the international strategic port. Because ocean shipping is a important infrastructure,a vessel evacuation procedure for a tsunami should be planned. The Kobe Marine Casualty Prevention Institute (2013) created a recommended evacuation area map from tsunami for vessel in Osaka Bay. The Kinki branch of Ministry of Land, Infrastructure, Transport and Tourism, Japanese Government (2014) provided the guidelines to create a manual on tsunami evacuation for operators of vessels in Osaka Bay. Detail of tsunami around the mooring pier should be understood in order to plan the evacuation procedure from a tsunami in each vessel. There are petrochemical complexes around the port of Sakai-Senboku, and various vessels enter. The spatial average of the vorticity of the tsunami vortexesin whole of Osaka Bay was at its maximum at 117 minutes after the earthquake occurrence. The vorticity at the entrance of Sakai Passage of the port of Sakai-Senboku is more than 3.2×10-3 s-1 at its maximum, and is maintained at more than 2.0×10-3 s-1. The size of the average vortexes at the entrance of Sakai Passage is longer than the length of a vessel. The location and the revolution direction of vortexes are decided in a place. And the high correlation between the magnitudes of vorticities generated by the tsunami and tidal currents was found. Therefore the tsunami vortexes can be deduced from the tide simulation.