Abstract
Local scouring around inland structures was observed in field surveys of the 2004 Indian Ocean tsunami and the 2010 Chilean tsunami. Although the mechanism of such local scouring has been elucidated for seawalls and fixed cylinders, local scouring around a movable structure remains to be investigated. In this study, local scouring around a movable cubic structure due to tsunami run-up and subsequent drawdown is investigated using hydraulic experiments. It is found that a scour hole is formed around a seaward edge of the structure regardless of the presence or absence of the drawdown, and the non-dimensional maximum depth of the scour hole relates with the non-dimensional overflow height of an incident tsunami and the non-dimensional embedded depth of the structure. The result suggests that the non-dimensional maximum scour depth around a seaward edge of a movable cubic structure can be predicted from the non-dimensional overflow height and the non-dimensional embedded depth of the structure.
