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Coastal dikes in Iwate, Miyagi, and Fukushima prefectures in Japan were seriously damaged caused by the tsunami by 2011 off the Pacific coast of Tohoku Earthquake. One of the main factors of damage was landward bed scouring due to tsunami overflow. We focused on the effect of shape of landward slope protection and toe protection works on landward bed scouring, and carried out small scale tests to clarify the effect of these works. The experimental results show that a large scouring hole was formed around the landward toe area in any shape of slope protection works without bed protection works condition. Landward bed protection works have an effect to reduce the size of scouring hole and surface protuberance of landward toe protection works have more effect to reduce the max scoring depth and the scoring area.

Effect of Shape of Landward Slope Protection and Toe Protection Works of Coastal Dikes on Landward Bed Scouring due to Tsunami Overflow