I think all the helter skelter building at water edge is probably the reason the beach is eroding. The constant grooming and grading of the sand, removal of seaweed, heavy foot traffic, raking and fluffing sand up for wind and water to easily take away is no help. The beach bounces back a little at times, but as a whole the beach is disappearing, and whatever they put there, or rebuild is not going to last, unless they get so far back that they're on rock/lava.