DefinePK

Abstract

Breakwater is a structure made parallel to the shore line and placed at certain distance from the coastline. The structure has function to protect the coast from the attack waves. The division of the energy waves reflected, destroyed, and passed on depends on the characteristics of the wave coming, shapes and dimensions of the breakwater. To find out the value of the transmission coefficient (KT), reflection coefficient (KR), and dissipation coefficient (KD) that occurs in breakwater type cube, and the influence wide the top breakwater (B) then carried out experiments at Hydraulic Laboratory, Faculty of Engineering, Tadulako University. Scale models used were 1: 30 with five variations wide the top breakwater and five frequency variation with two conditions of surface water. The results showed that the model of the breakwater that obtain the value of transmission coefficient (KT) and reflection coefficient (KR) smallest, largest dissipation coefficient (KD) is a model five submerged condition with the interval value of KT 0,333-0,366, interval value of KR 0,111-0,213, interval value of KD 0, 443-0, 556, merged condition with the interval value of KT 0,083-0,220, interval value of KR 0,171-0,333, interval value of KD 0, 500-0, 671 with a wide of the top breakwater 10 cm. The parameters that affect the transmission, reflection, and wave dissipation in breakwater were wide the top breakwater (B), high waves coming (Hi), wave length (L), and the depth of the water.