Abstract: Seabed scour about a seabed-mounted foundation or renewable energy device or anchor therefore, especially a wind-turbine monopile may be prevented or reduced by installing on or in the seabed area about the foundation or device an arrangement of interconnected sedimentation elements, which by virtue of the elemental structure or interconnective arrangement themselves do not cause or worsen seabed scour by substantially displacing seabed material on which the elements are placed. Elements having a specific gravity, either in situ or inherent, of substantially similar to the seabed material or mobilized seabed material in which they are placed are capable of achieving this. An ideal arrangement of elements (or mat) is one formed of used or discarded vehicle tires.