Experiments on the Motions of Flap Gate-type Breakwater in Plane Waves

Abstract

This paper describes a characteristic of the motion variances of each gate of the flap gate-type breakwater in plane waves. The authors investigated the gate motions in plane waves and water level in the water tank by three dimensional experiments. In an experiment, the motion variances of each gate could be confirmed while the gates stand up from the seawater surface condition to the vertically standing condition. However, the water permeate flow which takes a leaks from clearance of gates affects the motion variances of each gate and the incident waves hardly. The motion variances of each gate were decreased by the loosely-connecting the top of each gate and the motions of each gate were stable.