Abstract
Suction mechanism of reclaimed sand behind a rubble seawall has been investigated with hydraulic model experiments and numerical methods considering wave, structure and seabed interaction. It is consequently revealed that the Ursell parameter and the relative seawall width, namely, the ratio of the seawall width and the wavelength, have significant effects on the suction phenomenon regardless of the inclination of the seawall, and the sand suction easily occurs as vertical velocity in front of the beach and volumetric strain inside the sand increase. In addition, an increase of the sand/rubble diameter ratio results in a decrease of the aforementioned vertical velocity and the volumetric strain; hence efficiency of filter layers for the prevention of the sand suction is demonstrated.
