CONCLUSION
1. The influence of tide and flood gates on tsunami inundation can be shown when the effect of such gates is taken into account.
2. Closing gates is effective for decreasing tsunami inundation and delaying the inundation onset.
3. Present day gate management is inadequate to close gates when a tsunami comes, and it is stressed that improvement of gate management is necessary.
4. The above considerations provide effective countermeasures to decrease tsunami damage.
ACKNOWLEDGMENT
This investigation was partly supported by the Science Research Fund of the Ministry of Education (Grant-in-Aid for Science Research (C)), for which the authors express their appreciation.
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