Masanori Ishikawa

Study on Generation Mechanisms of Tsunami Resistance of Gentle Slope Revetment

Many coastal structures, especially embankment and revetment, were damaged seriously by Tsunami of Tohoku Earthquake occurred at March 11, 2011. However, many Gentle Slope-type Revetments were not broken and remain the function of disaster prevention. In this study, we focused generation mechanism of robustness of Gentle Slope-type Revetments to overflowing tsunami on the basis of field observation in Miyagi Prefecture and numerical analysis.The field observation revealed that almost no Gentle Slope-type Revetments were broken. Numerical results suggest that the robustness of the Gentle Slope Revetments is due to the decrease in the water surface elevation of the overflow and the landside scour depth.

DRAWING UP A PLAN FOR SHORE PROTECTION REFLECTING THE OPINIONS OF LOCAL RESIDENTS

This paper reports drawing up a shore protection plan reflecting the opinions of local residents in the southwest-coast of Ise Bay. In the meeting that two mayors, a town headman and scholars are member for discussion about shore protection in the coast, it was decided to organize the regional informal gathering for discussion about shore protection in three areas, Matsuzaka City, Meiwa Town and Ise City as opinion hearing method of the regional residents in June, 2002. Several ideas that were obtained from the opinion exchange of the meeting with the regional informal gathering were reflectedto the shore protection plan in the coast.