Abstract
Granular filters are applied for bed and bank protections and installed at coastal and offshore structures (i) to prevent erosion and (local) liquefaction, (ii) to avoid sinking and sagging of the cover layer into the subsoil, and (iii) to provide a sufficient superimposed load to the subsoil countering failure due to excess pore pressure. Offshore and coastal structures are mainly subject to oscillatory flow driven by wind induced waves. Geotechnical and hydraulic processes are studied and discussed with the key objective of developing hydraulic filter criteria for granular filters in marine environments. The focus of this paper is on the contact erosion at the interface of a wide-graded granular filter and subsoil subject to oscillatory flow perpendicular to the interface. For this purpose, a new test facility is applied for the first time and a new test cell is developed.
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