Waves on Permeable Layers

Numerical simulation of wave damping over porous seabeds

“…Wave damping over rigid porous seabeds has been studied experimentally by several researchers (e.g., Savage, 1953;Sawaragi and Deguchi, 1992). Savage (1953) conducted laboratory experiments to find out wave energy losses and wave height attenuation by bottom friction and percolation.…”

Pipeline–Seabed Interaction

“…These pressure variations induce shear stresses in the soil, when the 829 waves propagates as shown in Yamamoto (1981) and Madsen (1978), who both provide analytical solutions 830 for the induced shear stresses in the soil. 831 Sawaragi and Deguchi (1992) showed that in the soil, the wave-induced bed shear stress has negligible 832 impact on soil shear stresses as compared to the stresses induced by the bed pressure variations from the 833 waves. 834…”

Whole-wavelength description of a wave boundary layer over permeable wall

“…It is mandatory to verify that those properties remain unchanged in the passage from the impermeable to the permeable bed configuration. As a matter of fact, the presence of a finite-height bed of spheres determines a damping of the wave by introducing a wave height dissipation over the porous bed as described by Corvaro et al (2010) and Sawaragi and Deguchi (1992) in a laboratory context and by Liu and Dalrymple (1984) and Gu and Wang (1991) from a theoretical perspective. Moreover, when waves propagate over a porous bed, also their wavelength changes, because their dynamics can be assimilated to that of a wave propagating over a rigid impermeable bed with a larger effective water depth h eff , which depends mainly on the properties of the porous medium.…”