- Nonlinear Interaction between the Permeable Submerged Breakwater and the Second Order Stokes Waves by Weakly Nonlinear Model
- Kim, Do-Sam ; Yun, Duk-Yong ; Hur, Dong-Soo ; Ham, Gye-Un ;
- Journal of The Korean Society of Civil Engineers, volume 17, issue 2_5, 1997, Pages 477~477
Abstract
Recently, the interests of the construction of the submerged breakwater have been increased to preserve and to improve the coastal environment, and to control the incident waves and littoral transport. It is important to predict the wave transformation due to the permeable submerged breakwater. The wide submerged breakwater and the shallow water depth on its crown are needed, generally, to break the incident waves and to decrease the wave energy by friction between the rubble stones and the waves, because its transport is very much on the crown. In this case, the amount of rubble stones of the permeable submerged breakwater is greatly increased, which results in the increment of construction cost. In this study, the one-rowed and two-rowed submerged breakwaters are considered, where the rubble stones of the two-rowed one are smaller than those of the one-rowed one. The objective of this study is to discuss the nonlinear wave transformation and its characteristics of each breakwater type. Dupuit-Forchheimer formula is applied to the in analysis of the the fluid resistance of rubble stones, and the equation about equivalent linear frictional parameter is modified based on the Lorentz's condition for the equivalent work. The frequency domain method, based on the pertubation method and the boundary element method (BEM), is used for the analysis of nonlinear wave transformation. The numerical results are compared with the experimental and Kio-ka's ones for the verification of this study. It seems to be in the good agreements among the three results. It might be confirmed that the two-rowed submerged breakwater can control the incident waves more efficiently than the one-rowed one.