2024 Volume 80 Issue 18 Article ID: 24-18021
In order to protect port facilities and hinterlands from flooding caused by tsunamis and storm surges, a movable seawall system installed on the seabed that can close the harbor entrance without obstructing the landscape is attracting attention. These movable gates are required to withstand massive earthquakes and subsequent tsunamis without collapsing and losing their protective function. The authors proposed a new type of "movable lifting gate," which is installed below the seabed of the harbor entrance. In this paper, a method for verifying the tsunami protection effect and structural stability against the tsunami loading under a liquified ground condition is proposed to assure the safety of entire system, assuming various design conditions of an industrial complex port to be affected by the Nankai Trough earthquake. A series of analysis considering seismic, liquefaction, and tsunami loads confirmed that the "movable lifting gate" is safe against expected external forces of earthquakes and tsunamis.
