2009 Volume 65 Issue 1 Pages 811-815
A new type structure of break water head covered with wave dissipation blocks was proposed to slash the construction cost. This structure is simply to set a caisson with longer width than a trunk caisson, which can decrease the number of wave dissipation blocks by making use of the longer end-wall of the head caisson. Three dimensional hydraulics model tests were carried out to solve various technical issues regarding the stability and safety of this structure. It was clarified that the current design standard of port facilities is partially applicable to determine the structural dimension, and careful attention must be paid to the depression of crown height of wave dissipation blocks.