2020 Volume 76 Issue 2 Pages I_162-I_167
After the Great East Japan Earthquake, countermeasures against tsunami overflowing on seawalls caused by expected tsunami are required. For PRA, one of the analysis methods, the relationship between tsunami height, seawall height and inundation depth are required. And, behind the seawall area, some phenomena that cannot be reproduced by the generally applied long-wave approximation, such as supercritical flows, occur. In this study, hydraulic experiments were carried out to clarify the inundation characteristics of the overflow behind the seawall and to develop the evaluation model based on the inundation depth of the passing wave without seawall. The results of this study are expected to be used for efficient implementation of PRA and safety examinations of structures installed at the back of the seawall.
