Abstract
This study conducted a series of hydraulic model experiments using honeycomb structure blocks which possess hexagonal aperture as armour blocks of an artificial reef. The experiments evaluated stability performance of honeycomb blocks and effects of relative water depth h/L to the stability number Ns. The procedure of experiments follows “A Manual on Hydraulic Model Test to Evaluate the Stability of Artificial Reef Blocks against Waves” issued from the National Institute for Land and Infrastructure Management in 2016. The results clearly show honeycomb blocks have higher stability number Ns than the existing blocks. In addition, h/L has an effect on the stability performance because the smaller h/L is, the smaller Ns is. Furthermore, in case that the relative crown depth R/H is high, the wave transmission coefficient of the artificial reef covered by honeycomb blocks becomes lower than by rectangular blocks. As a result of experiment on the processes of expansion of damage, it occurred from wave breaking point. Honeycomb blocks has remarkable stability performance even in the surf zone where armor blocks are easily lifted up.
