PROPOSAL OF METHOD OF DETERMINING CROWN HEIGHT OF PARAPET AGAINST TSUNAMI

Abstract

 The 2011 off the Pacific coast Tohoku Earthquake Tsunami caused serious damages to coastal protection facilities constructed on the land. In the present design for coastal protection facilities against tsunamis, the crown heights have to be designed in order to prevent the overflow by the tsunami whose return period is equal to the designed service lifetime of the facilities.
 On the other hand, more reasonable crown heights can be designed on the basis of the amount of damage by tsunami overflow. In this study, the method of determining the crown heights of parapets against tsunami is proposed in which the initial construction cost and the amount of damage are estimated. The applicability of the proposed method is discussed by introducing the index to express the extent of the damage and the appropriate estimate of the amount of damage.