Wave parameters after smooth submerged breakwater: Fid-Bau Portal

Wave parameters after smooth submerged breakwater

Carevic, Dalibor / Loncar, Goran / Prsic, Marko

Abstract Based on the experimental studies of smooth submerged breakwater in the wave channel, it has been studied how the breakwater impacts on the changes of representative wave periods when the waves cross the breakwater. It has been shown that the reduction of the wave periods has a strong relationship with the wave steepness and relative submersion Rc/Hm0−i. Also, the impact of waves crossing the smooth submerged breakwater onto the Rayleigh's distribution of wave heights was investigated. The influence of short and long waves generated after submerged smooth structure on temporal analysis has been investigated. The Lanczos filter was used for high and low frequency wave removal. It was concluded that long and short waves do not significantly influence the temporal analysis of periods. The Van der Meer et al. (2000) model for the description of the transmitted spectrum has been improved so it gives better agreement with measurements. It was assumed that transfer of the energy from lower to higher frequencies vanishes linearly with a decrease in the relative submergence −Rc/Hm0. The energy transferred to higher frequencies is assumed as uniformly distributed between 1.5fp and 3.2fp.

Highlights • Wave periods reduction depends on the ratio of the submerged breakwater submersion and incoming wave parameters (Rc/Hm0-i). • Zero crossing periods are reduced after submerged breakwater becouse of the generation of superharmonics in the wave record. • Amount of the transmitted wave energy to higher frequencies in the wave spectrum depends on the relative submergance Rc/Hm0-i. • Waves are distributed according to the Rayleigh distribution after smooth submerged breakwater. • Away from the breakwater waves behave like a Gaussian process (independent propagation of components.