SCARP GENERATION BEHIND A DUNE AND SHORE PROTECTION STRUCTURE BY TSUNAMI ON MARCH 11, 2011.

Abstract

 The 2011 off the Pacific coast of Tohoku Earthquake caused catastrophic damage along coastal area in Tohoku and Kanto regions, Japan on March 11, 2011. The big tsunamis generated by the earthquake caused beach and dune erosion as well as destructions of coastal structures. The tsunamis also scoured and breached significantly just behind a crest of frontal dune and shore protection structures such as sea wall and mild slope revetment which exist along a shoreline but not perpendicular to. The dune and coastal structures are usually expected to play a role as a sort of the last defense against massive tsunami force. Therefore, the size of scouring and breaching by the tsunami are studied by using aerial photographs and field survey.