The Welsh community of Borth is seeing a massive coastal defense upgrade by engineering firm Royal Haskoning. The project consists of a series of shore parallel breakwaters, groynes, and a Multi-Purpose Reef.
Naturally we have been paying close attention to the construction of the North and South Multi-Purpose Reefs. Because construction consists of interlocking rocks, Royal Haskoning has built a temporary causeway and can only work on these structures at low tide.
The community of Borth has done an excellent job of documenting the work and proving those resources for the community. Check out the September / October pictures here and the coastal defense project scheme here.
This video shows the pysical modeling of the coastal defense scheme at HR Wallingford facilities.