An Examination of Countermeasures at Fishery Ports and Harbors in Awaji Island against Nankai Trough Great Earthquake and Tsunami

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Kohji Uno, Akira Sezaki

Tuesday 30 june 2015

12:39 - 12:42h at South America (level 0)

Themes: (T) Flood risk management and adaptation, (ST) Flood risk assessment, Poster pitches

Parallel session: Poster pitches: 5J. FloodRisk - Assessment

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Awaji Island is an island in Hyogo Prefecture, Japan, in the eastern part of the Seto Inland Sea between the islands of Honshu (main island in Japan) and Shikoku. This island has an area of 592.17 km² and is the largest of the Inland Sea's islands. The fishery is one of the core industries and many ports are put in place around the island. In the south of this islands, the Nankai Trough, a submarine trough is lied. The underlying fault, the Nankai megathrust, is the source of the devastating Nankai megathrust earthquakes. If Nankai Trough Great Earthquake happens in the near future, it is expected the coastal regions of Awaji Island will suffer serious tsunami damage. After the 2011 Tohoku earthquake and tsunami, the Central Disaster Prevention Council in Japan announced the anticipated damage from Nankai Trough Great Earthquake; however, the verification in detail hasn’t been conducted yet. In this study, we extracted the present states and problems on tsunami disaster prevention by hearing investigations for the managers of ports and examined the characteristics of the anticipated tsunami damage such as submerged depth, temporal limitation of residents and ships by using the numerical simulation results. Our obtained findings are as follws. From these examinations, it is clarified the disaster-affected risk is different from region to region. Therefore, it is important to draft the prevention and reduction plans in keeping with local area characteristics. In addition, a series of the examination result is useful for deciding the priority of countermeasures.