Experimental Study of Wave Run-Up and Overtopping for the Concrete Armour A-Jack on a Seawall Structure

The seawall is a coastal protection structure built on the coast to separate land and sea areas. In order to fulfil its function, the seawall is designed to anticipate the occurrence of run-up and overtopping. Data on run-up height and wave overtopping are required to determine the effective structural height for its application. This study has used A-Jack-type concrete armour to analyze wave run-up height and overtopping volume on seawall structures. Experiments have been conducted at the wave flume, ocean engineering ITS, with a model scale of 1:20. Regular waves are generated with height variations and periods perpendicular to the seawall. The experimental results show that a seawall with a gentler slope is more effective in reducing run-up height and overtopping. Run-up heights for slopes of 1:1, 1:1.5, and 1:2 are 0.12 m, 0.11 m, and 0.09 m, and the overtopping discharge is 3.03 × 10-6 m3/s/m, 1.33 × 10-6 m3/s/m, and 9.12 × 10-7 m3/s/m, respectively, which occur at the same wave height and period.