||Wave interaction with a rubble-mound breakwater has been studied experimentally in the thesis.|
The breakwater may contain multi-layer anisotropic but homogeneous media. Fluid outside the
porous layer field is assumed to incompressible and viscous,and the flow field is irrational. The study
applies the velocity potential to describe the wave field with small amplitude incident wave.
Under the consideration of linearity, Analytical solution is solved from boundary value
program by the method of separation of variables. It bases on dispersion equation. Try to find the
range and position of the complex eigenvalues in each porous column and to solve the velocity
potential in the field by numerical methods. Wave reflection, transmission, and energy dissipation
with a rubble-mound breakwater have been investigated experimentally, and consider the wave close
linear wave theory, the wave steepness smaller than 0.035. Three different sizes of grain are used to
construct the porous base, they are 16mm, 25mm, and 35mm, respectively. Single and double layers
of porous base are considered.
Some of the reflection coefficient are convergence, but they are the unreasonable results.
Maybe the trouble is in the process of the computation with determination of .eigenvalues. When the
wave has long period, the double-layer porous model reduces more wave energy, when the wave has
short period, the single-layer porous and the smaller porous material model can disappears more wave
energy. The characteristic of internal resistance in the porous has the difference along with the wave
period. When the model crest is higher than the sea level, the consumption of wave energy are more
when it is shorter along with the wave period. As a submerged breakwater, the effect for disappears
wave energy to be limited.