PROPOSAL OF NEW TSUNAMI GATE

Abstract

The present study shows the importance of the flood gate performance during severe earthquake accompanied by tsunami. One of the major concerns for mitigation of disastrous earthquake was the occurrence of Tokai, Tonankai and Nankai, Miyagi-oki earthquake which are expected to be accompanied by huge tsunami. Because tsunami source of those earthquakes locates very near to the coast of Japan, quick operation of gate-closing is necessary. Exiting flood gates are recently renewed for automatic operation but it takes much time to close the gate and damage during earthquake and resultant incapability of gating are worried. Considering those situation, new type of flood gate which was designated as a special countermeasure for tsunami was presented. This new tsunami gate gives us the reliable gating capability and safe system at emergency situation by employing the self-gate-closing system.