The Eksperimentation Study of Wave Transmission Trough Type Of Hollow Cube Breakwater

Erosion that occurs in break water by wave sand currents is a serious problem along coastal and inland shore [1]. This study aimed to assess the effect of the model height (Hm) and the pole density on the model on the reduction of the wave height and on the relationship between the nondimensional parameter. The research was experimental with 2D physical model simulation which was conducted in the laboratory of Marine Engineering Faculty, Hasanuddin University. Several of configurations of Hollow-type breakwater models were made with different densities and model heights. The model scale use was 1:10 for the three model variations ((M1KB, M2KB, and M3KB) with the variations of the periods and of the wave height, at 0,25 m water depth. The research results indicated that the parameters which showed significant effects were the model height and the model density. These parameters showed the transmission coefficient (Kt) which tended to decrease while the value of the density and model height tended to increases respectively. The value (Kr) also showed an increased response to the increasing value of ψ. This is consistent with the theory that the closer the structure cross-sectional series to the in-coming waves, the greater the response of the reflection wave height. Hence, the is non regression equation which showed the relationship between the nondimensional parameter ψ with Kt and Kr, was produced K# = m. e()* and K+ = p. lnψ + q where ψ = ζ. 34 5 ; m and n respectively 0,6882 and -4,818; p and q respectively 0,046 and 0,3493.