Abstract
This study aims to evaluate the wave reduction effect of the Hydroplane Tsunami Barrier which does not need electric power and human operation, and judgment as countermeasure against tsunami. It assumes that this breakwater is installed on a bottom of entrance of bay and a river mouth and so on. The reduction effect of wave height, velocity and tension which acts on the fixing belts were measured by hydraulics experiments using 1/50 model of the real scale (20m in height, and 60m in width).
As a result, the reduction effect of wave height was increased with incident wave height. This reduction effect for the long-period wave is more effective than a short-period wave. Since the reduction of flow velocity was more effective than that of wave height, it suggested that mitigation of the damage caused by a Tsunami flow in a port was expected. Moreover, about the tension acting on the fixing belt which is an important point of the mechanism of this barrier, the maximum tension by a short-period wave became a comparatively large value. Although, it is shown that the maximum tension is equivalent to the wave force which acts on the usual breakwater, and a real scale design and field instration are possible.
