Abstract
When a huge tsunami surges over coastal land areas, coastal industrial facilities such as electric power plants might be severely damaged, as was widely seen in the 2011 off the Pacific coast of Tohoku Earthquake. Even if high seawalls provide some protection from tsunamis, inundation caused by overflow through open sections via underground drainage channels could occur. It is therefore essential to estimate precisely the impact of such inundation on various important buildings and structures located in industrial facilities.
To achieve this, the Integrated Urban Area Flood Estimation System, developed through the collaboration of Kajima Corporation and Chubu University, is employed. The system was originally devised for evaluating inland inundation in urban areas under heavy rain, but a numerical model of overflow via underground drainage channels has been proposed and implemented to extend its application to inundation of coastal industrial facilities following tsunamis. For verification of the proposed tsunami inundation simulation, hydraulic experiment for an idealized model of a power plant site was conducted. It was confirmed that the time series of water levels obtained by the experiment and the tsunami inundation simulation show very good agreement.
