Stability of breakwater armour using rock pockets on transition wave

Abstract

Breakwater, which is one of the coastal protection systems that is often used in Indonesia, has a major component of the armour/protection layer. Breakwater armour on the coast has three possibilities for wave attack, are shallow waves, transition waves, and deep waves. Using rock pockets as armour in transition waves has significant characteristics and influences on the coefficient of damage value. This study aims to obtain the Coefficient of damage breakwater armour using rock pockets in transition wave conditions. This research is experimental with physical tests conducted in the 2-D wave channel at the Laboratory of Marine Engineering, Faculty of Engineering, Hasanuddin University. Making with several waves, and weight of armour configurations. Transition waves are obtained by plotting and eliminating the wave classification graph. The scale model used is 1: 10, with three water depth variations, are 25 cm, 20 cm, and 15 cm. The results showed that coefficient of damage armour at the end (head) of the breakwater for the transition wave for slope device 45o, coefficient of damage value is 3.92, at the slope device 60o Coefficient of damage value is 4.52.