THE DAMAGE OF SHORE PROTECTION FACILITIES AROUND THE FISHING PORT DUE TO THE 2011 OFF THE PACIFIC COAST OF TOHOKU EARTHQUAKE AND TSUNAMI

Abstract

 The coastal areas of Tohoku was atacced by Tsunami due to the 2011 Off The Pacific Coast of Tohoku Earthquake that occurred on March 11, 2011.There were severe damage to shore protection facilities, dikes, seawalls, and breast wall. Because it was assumed that the tsunami was higher than the external force of the shore protection facilities design, Fisheries Agency conducted the survey of the disaster, the analysis of the external force and a review of the design conditions before the restraction works.
 In this paper, we reducted the situation of damage to facilities and the patterns affected from the results of the "The 2011 emergency survey of the disign conditions of shore protection facilities". Breast wall affected is higher than the percentage of destroyed dikes and seawall. Percentage of affected by the push waves and back waves, the damage of dikes were about the same, the damage of seawall were a high percentage by back wave, and the damage of breast wall were a high percentage by push waves.