Abstract
In October, 2006, the coastal road of national route No.238 was damaged by storm waves at Sarufutsu Village in Hokkaido. In this research, two-dimensional hydraulic model experiments were conducted to reproduce the damage condition and to examine the temporary countermeasures. At the site of the damage, wave run-up induced by high waves continued for about 12 hours, and the deficit of the road shoulder arose. Based on the test results, tetrapods of two layer with three row should be necessary for the stability of large sand bags and the safety traffic. The applicability of the proposed countermeasures was also confirmed by field observations.
