Abstract
In contrast to many post-tsunami studies focusing on tsunami inundation heights, this study focuses mainly on tsunami flooding flow directions, which may have more direct impact on damages of structures. Based on tilted poles and trees in the inundated area, this study collected data of tsunami flow directions at Rikuzen-takata, Ootsuchi, and Naraha on the east coast of Japan. Numerical tsunami inundation model was then applied to each of these sites to investigate the relationship between simulated time-varying flow patterns and observed flow directions. Such link is essentially important to deepen our understandings on the dynamics of the inundation tsunami flow.
Highlights
INTRODUCTIONThe Sanriku coastal area, the northeast of the Tohoku region, was severely damaged by the tsunami, which showed complicated behaviors on the low area located inner of a bay with a indented coastline
The 2011 Tohoku tsunami has caused serious damages along the Japanese coast
We totally collected more than 850 points of flow direction data in the site (225 in Rikuzen-takata, 362 in Ootsuchi and 269 in Naraha)
Summary
The Sanriku coastal area, the northeast of the Tohoku region, was severely damaged by the tsunami, which showed complicated behaviors on the low area located inner of a bay with a indented coastline. This indicates that it is important to understand detailed behaviors of tsunami flooding for more effective tsunami mitigation plan. We focused on tsunami flooding directions to study the tsunami run-up process, and conducted a field survey to find the flood traces left by the tsunami. We carried out numerical simulation to clarify the behavior of the tsunami in coastal low area by careful comparison with the observed flow direction data
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