2020 Volume 76 Issue 2 Pages I_282-I_287
On the Akahama coast in Takahagi City, 35 km north of Hitachinaka Port, the seawall was severely damaged over 120 m length due to storm waves associated with T1919 which landed in the Kanto Plain on October 12, 2019. On October 27 after the typhoon, field observation was carried out and the causes of damage of the seawall were investigated. The direct cause was the rapid disappearance of the foreshore in front of the seawall due to erosion, and the earth material under the seawall was drawn out, causing a void under the front surface of the seawall.