Attenuation of Random Deep Water Waves by a Porous Walled Breakwater.

摘要

The porous walled resonating chamber, a type of breakwater,is investigated as a means of reducing reflected waves from structures subjected to random wind generated waves in deep water. Extending laboratory monochromatic studies to a full-scale apparatus appended to a floating bridge allows assessment of scale factors and the effects of random waves on the predicted performance of the device as a linear damped oscillator. The full-scale device is shown to be frequency selective at a frequency precisely corresponding to the predicted resonance of the system. The forces,measured on the porous wall,are lower than predicted and the device completely eliminates the problem of wave runup onto the bridge roadway.