A theoretical study on a permanent wavefilter

S. W. Twu, Cheng-Chi Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)


This paper investigates a wavefilter which could effectively eliminate re-reflected waves generated in a wave flume over a certain range of wave periods. The wavefilter is not required to change its thickness for different incoming wave periods and is, therefore, termed here a permanent wavefilter. The structure comprises of a set of multilayer porous media. Their related properties such as porosities, friction factors and thickness are sought with the hope of developing a structure which could serve the desired purpose. A theoretical study has been performed. It was found that a multilayer porous media could eliminate re-reflected waves without resorting to adjusting the medium property whenever wave period changes, only if the thickness of the media has to exceed a certain amount. Generally speaking, a thicker multilayer porous media is needed for longer-period waves, while a thinner one is suitable for shorter-period waves. The wavefilter considered here could serve both eliminating re-reflected waves and also providing a desired median wave height if all of those related factors of the media have been properly selected and if the generated waves are restricted to not too wide a range of wave periods. However, it is unlikely that a wavefilter with fixed thickness can remain effective over too wide a range of wave period.

Original languageEnglish
Pages (from-to)191-206
Number of pages16
JournalOcean Engineering
Issue number2
Publication statusPublished - 1995 Jan 1

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Ocean Engineering

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