Annual Journal of Civil Engineering in the Ocean Vol.36 (Special Feature)
DAMAGE OF SEAWALL OF ROUTE NO. 134 ON SHICHIRIGAHAMA COAST DUE TO EROSION
2020 Volume 76 Issue 2 Pages I_312-I_317
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2020 Volume 76 Issue 2 Pages I_312-I_317
On August 13, 2019, the seawall protecting Route No. 134 running along the coast was destroyed, and the walkway along the road collapsed. The direct cause of the failure of the seawall is due to high waves associated with Typhoon No. 10 crossing the Japanese archipelago, but the change in the seawall was initiated from 2 months before the damage. Field observations were carried out before and on August 20 after the storm, and the causes of the damage were investigated. Furthermore, shoreline changes of the coast were investigated using aerial photographs. It was found that the beach erosion of the coast was triggered by the discharge of longshore sand turning around the tip of Inamuragasaki Point located at the east end of the coast.
