海岸堤防を越流する津波による洗掘の発生機構と被覆工の安定性に関する研究

抄録

Tsunami-induced local scouring at the landward toe of a coastal dike is investigated experimentally and numerically in terms of the process of the scouring, the response of the foundation, and the stability of armor blocks. From a comparison between experimental data and numerical results, the predictive capability of a numerical model taking into account fluid-sediment-seabed interactions is demonstrated in terms of water surface elevations and scour profiles. Furthermore, it is found that armor blocks below the top and berm of the landward slope of the dike receive large landward and upward force because of an increase in air pressure inside the dike and a decrease in water pressure induced by flow separation, suggesting that these blocks would be vulnerable against tsunami overflow.