Abstract
The reduction of an inundated water depth and flow velocity by a vertical tide barrier, which is installed in order to higher a crown height of an existing seawall against tsunami attack, was investigated through physical model tests. The inundated water depth and flow velocity behind the barrier were measured with changing a barrier height as well as a tsunami height. An elevated seawall with the vertical tide barrier effectively reduces the inundated water depth, and its efficiency depends on the tsunami height as well as the barrier height. On the other hand, reduction effect on the inundated flow velocity is extremely small compared to the inundated water depth. When the vertical barrier is installed retreated landward position, control functions of the tide barrier on inundated water depth and flow velocity are nearly same as the functions where the barrier is installed at the tip of the seawall, though the run-up height of tsunamis in front of the barrier is extremely reduced.
