2012 Volume 68 Issue 2 Pages I_1-I_6
The East Japan great earthquake and tsunami disaster which occurred on March 11, 2011 seriously dameged even port facilities.
Assuming two levels of tsunami, "the maximum class" and "the comparatively high frequent class", and "disaster reduction" were proposed through the discussion repeated in some councils, committees, etc., meanwhile a concept of "persistence or persistent structure" was suggested.
In this paper, the present situation of consideration and discussion, etc. on a way to design correspondding to "disaster reduction" and a view of "redundancy, toughness and ductility" are reported mainly on breakwaters and seawalls among port facilities, also introducing the information about the damage mechanism obtained by subsequent examination.
