Abstract—It is common in the study of breakwater to evaluate variables that influence the stability number (Ns) and the breakwater armour units such as height of wave, wave period, wave angle direction, layer coefficient, and porosity. This research aims to obtain a new formula for the stability number of breakwater armour units (Hs/ΔDn or Ns) for nonbreaking wave effect irregular wave that can be applied for all types of breakwater armour units. It is based on a scaled physical model, especially undistorted model. The analysis of the wave and regression were conducted using zero up crossing data and least square method respectively. The New Stability Number (Ns) is a function of Porosity (Po), Level of Damage (d), Number of Wave (N), Coefficient of Layer (C), Angle of Wave Approach (Cos Ө), and Surf Similarity (ξZ). The evaluation of the result has been made by comparing with existing formulas such as Hudson, Modified Hudson and Van der Meer. The result shows that the proposed stability number (Ns) is the smallest compared to the one obtained from the formulas of Hudson, Modified Hudson and Van der Meer, so it is the most reliable or optimum stability number.
Index Terms—Armour units, breakwater, non-breaking wave, stability number.
Ignatius Sriyana is with the civil department at Faculty of Engineering, Diponegoro University, Tembalang Campus, 50275 Semarang, Indonesia (e-mail: sriyana808@gmail.com, sri.bibeh@gmail.com, sriyana@sipil.undip.ac.id).
[PDF]
Cite: Ignatius Sriyana, "New Formula of Stability Number of Wave Breaker Armour Units for Non-breaking Wave Effect Irregular Wave," International Journal of Engineering and Technology vol. 10, no. 1, pp. 12-17, 2018.
