Only somewhat related, I recently was in Malibu and needing to relieve myself my wife and I stopped into an open house for a beachfront home. Nice house, private beach access. Anyway, the agent tells me that just down the road the residents there lost their private beach. Work was done to a harbor a couple miles north and it changed the tidal dynamics and in just a couple of days all the sand was washed away.
I had never heard of that before. Hard to feel too bad about people losing their private beach but interesting nevertheless.
The house had nice facilities, 10/10 would use again.