Abstract
Offshore man-made islands and reclaimed lands are planned for making use of ocean space. Seawalls are important to reduce wave overtopping rate. Recently, seawalls with low crown height are needed to reduce construction cost. Hydraulic model tests were conducted to evaluate overtopping quantity of four kinds of composite-type seawalls with low crown height. Firstly, wave overtopping quantity is measured to determine the crown heights. Secondly, wave pressure on caissons and parapet is measured to design four types of seawalls considering the site condition. At last, volume of wave dissipating concrete block and concrete caisson is compared with each other in order to evaluate cost reduction of seawall construction. It was found out that the seawall with concrete block on the top of caisson has the highest performance on reduce wave overtopping.
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