There is actually a wikipedia article about the technique in the article, which mentions the locations: https://en.wikipedia.org/wiki/Dynamic_revetment https://

There is actually a wikipedia article about the technique in the article, which mentions the locations: https://en.wikipedia.org/wiki/Dynamic_revetment https://en.wikipedia.org/wiki/Dynamic_revetment Note that all the projects mentioned are along the US Pacific coast. So I don't think you are being a naysayer, as much as pointing out that it is not useful everywhere. I live on the east coast of Florida, and we have similar problems to Gold Coast with infrastructure blocking the longshore drift of sand. Sand is constantly in need of replenishment in locations say, south of Port Canaveral. I wonder if we will ever have a property right to the river of sand in the same way that water rights are enforced upon rivers. I seem to remember a method proposed of placing wave attenuators just past the break as a way of depositing sand, but unfortunately I cannot remember the name of it and could not find it through a quick search. I was hoping that we might try this method where I live.