Abstract
The reflection and transmission of wave dissipating work mainly depend on the shape and porosity of wave dissipating block. However, the influence of the shape and porosity of wave dissipating block on the reflection and transmission has not been investigated sufficiently. The purpose of this study is to investigate the influence of the porosity of wave dissipating block on the reflection and transmission coefficients through a series of hydraulic experiments where four kinds of wave dissipating blocks were used. Wave dissipating blocks with smaller porosity provided a larger reflection coefficient and a smaller transmission coefficient as a whole. However, a wave dissipating block provided a smaller reflection coefficient and a smaller transmission coefficient in spite of relatively larger porosity. The measured reflection and transmission coefficients were compared with those estimated by existing equations.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/lqyzabMw66U
Highlights
Hydraulic performance of wave dissipating work such as the reduction of transmitted wave height, reflected wave height, wave overtopping, wave pressure acting on structures and so on mainly depends on the shape and porosity of wave dissipating block
The reflection and transmission coefficients Kr and Kt of the rubble mound structures composed of the wave dissipating block with smaller porosity were larger and smaller among Tetrapod, Dolos II and Tetraneo, respectively
The reflection and transmission coefficients Kr and Kt of the rubble mound structures composed of the wave dissipating block with larger porosity were smaller and larger among Tetrapod, Dolos II and Tetraneo, respectively
Summary
Hydraulic performance of wave dissipating work such as the reduction of transmitted wave height, reflected wave height, wave overtopping, wave pressure acting on structures and so on mainly depends on the shape and porosity of wave dissipating block. Sollitt and Cross (1972) theoretically investigated the wave motion in porous media and estimated the reflection and transmission coefficients. Madsen (1974) theoretically investigated the wave motion in porous structures and obtained the reflection and the transmission coefficients from a linearized theory. Van der Meer and Daemen (1994) and D’Angremond et al (1996) analyzed the wave transmission through low-crested rubble mound structures and proposed an equation for estimating the transmission coefficient. Van der Meer et al (2005) investigated the wave transmission through low-crested rubble mound structures in 2D and 3D experiments. Zanuttigh and van der Meer (2008) analyzed the wave reflection of sloping structures using an extensive database and derived an equation for estimating the reflection coefficient. Zanuttigh and van der Meer (2008) analyzed the wave reflection of sloping structures using an extensive database and derived an equation for estimating the reflection coefficient. Zanuttigh and Andersen (2010) investigated the influence of the wave angle of incidence and the wave directional spreading on the reflection coefficient using the data measured in a wave basin
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