Abstract
After the 3.11 earthquake, the design of tenacious tsunami breakwaters is required in Japan. The steel piles and widening works construction method proposed for tenacious breakwater. These methods increase the construction cost. It is a problem to pay expenses to external forces beyond design wave. In this research, we propose a tenacious tsunami breakwater design with low cost.
The proposed design method sets a low safety factor for some of the breakwater caissons. The breakwater will collapse locally against the tsunami over design waves and escape from complete destruction. We conducted a model test of a tsunami breakwater with locally lowered safety factor. As a result, it was confirmed that this method is effective for the tsunami of 1.4 times the design tsunami.
