Wave Run-Up and Reflection on a Permeable Sea Wall

The swash oscillation on a sloping seawall made of step-shaped concrete blocks, waves and water particle velocity in front of the seawall were measured. It was inferred that incident waves form two-dimensional standing waves with the anti-node in the swash slope. Results of wave separation indicated the individual wave reflection predominantly occurred. Wave reflection ratio from the seawall was similar to the value of natural beach which had a steep beach face. This may be caused by an effect of permeability of the seawall.