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Article

Open Access

Tsunami Force Reduction due to Obstacle in Front of Coastal Dike and Evaluation of Collision Force by Driftage

Author(s)

Shuhei Ono and Tetsuya Hiraishi

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DOI:10.17265/1934-8975/2017.05.003

Affiliation(s)

Disaster Prevention Research Institute, Kyoto University, Kyoto 612-8235, Japan

ABSTRACT

Tsunami caused by the Tohoku earthquake on March 11, 2011 washed away a lot of buildings and deprived many lives on unexpected scale. Seawall is one of the measures to reduce tsunami damage, but itself is also given great damages by tsunami. Study on mechanism of tsunami force acting on seawalls is also quite important and improvement of countermeasures is very important. Hydraulic experiments were conducted to estimate wave force and collision force by driftage due to tsunami on various conditions. The tsunami force reduction due to obstacles installed shoreline is examined and assessed by previous formula. Collision force by driftage due to tsunami is also investigated and assessed by previous formula.

KEYWORDS

Seawall, tsunami, wave force, obstacle, driftage, collision force.

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