安定性（海岸・港湾施設）

[II-157] Road disaster prevention for coastal erosion damage during the winter storm

〇Ryota Tsubokawa¹, Kazuaki Mutsuura¹, Yasunari Iida¹, Yuuji Ushiwatari¹, Tatsuya Matsuda², Makoto Miyatake³, Shinji Sassa⁴ (1.Koken Engineering, 2.Toyohashi University Of Technology, 3.National Insuitute Of Technology, Hakodate College, 4.Port and Airport Research Institute)

Keywords:Coastal road damage, Winter storm event, High waves, Shore erosion

In recent years, as the wave height increases, the frequency of high waves hitting the coastal road has been increasing, which has caused frequent embankment damage on the coastal road. In this study, we investigated the mechanism of erosion of foreshore, which was confirmed in December 2014 on the sandy beach along the National Highway on the Oshima Peninsula, Hokkaido at the time of the disaster. The erosion calculation of the foreshore was carried out by Larson model based on the survey, bathymetric survey, and grain size test, and it was confirmed that the method could be applied.