Wave Interaction With Submerged Porous Breakwater And Seabed Dynamical Response Analysis

The analysis for dynamic stability of seabed or offshore foundation under wave loading is of practical significance in the design and construction of offshore and coastal structures. When wave propagate over the ocean surface, a sequence of wave pressure is induced on the seafloor. The wave pressure induces a stress field and associated pore water pressure fluctuations within the seabed. With excess pore and diminishing vertical effective stress, part of the seabed may become unstable or even liquefied. The instability of the seabed has been responsible for the damage and destruction of offshore structures. So it has importance in theory and applied value of engineering to research the dynamic pore water pressure responses of sandy seabed under waves loading are developed.This paper researches those following questions: the interaction between the wave and breakwater with riprap porous media, and elastic dynamic response questions of its corresponding sandy seabed and pure sandy seabed. Based on the theoretical analysis of the wave field and riprap medium pore fluid field, by using turbulent Navier-Stokes equation, the introduction of k-εmodel to close the Renault equation, build mathematical model of wave waters,.It established the analysis for the difference finite program of wave-riprap submerged breakwater interaction. Analyzing the results, we get the regularity of the action between riprap submerged breakwater under different situations (different waves' elements such as wave height, wave cycle and water height under the action of a pilot Linear wave or the shallow water ellipsoidal wave).Based on the inherent anisotropy characteristics of natural saturation seabed, natural seabed will be assumed to be transversely isotropic saturated porous medium, and based on the transversely isotropic saturated porous media Biot dynamic penetration - consolidation theory, set up the transversely isotropic saturated seabed dynamic equations, establish the dynamic consolidation finite element program, Using the dynamic consolidation finite element program DSFEM to have system parameters analysis on the homogeneous and isotropic saturated seabed and non-homogeneous anisotropic saturated seabed dynamic response questions(under the action of a pilot isolated wave or the shallow water ellipsoidal wave),get the changing regularity of seabed within the pore water pressure under different waves' elements group situations .