Long-Term Shore Changes
This study investigated characteristics of the shoreline retreat and recovery after the 2011 Tohoku Earthquake at nine coasts along the northern Pacific Coast of Japan. Observed shoreline retreat showed clear correlation with the land subsidence and the tsunami height. Except Nami-ita coast, all the other eight coasts showed certain recovery of the shoreline after the disaster. The field survey at Nami-ita coast revealed that relatively high reflected waves from the narrow and steep beach in front of the seawall blocked shoreward movement of the relatively fine sand grains transported and deposited offshore through the disaster.