Anything placed offshore as a breakwater (rubble, wrecks, floating things) has been tried with limited sucess, and some major drawbacks. One of these drawbacks is increase erosion at the end of these structures, where wave focusing creates erosional hotspots. They did similar projects at Presque Isle State park, PA....
IF these are privately funded, I have no problem... assuming they are done in a manner that makes geologic sense...
FYI if you go to Ocean City MD, a portion of the local hotel tax goes to the long-term beach replenishment: i.e. no tax payer money... a very very well run project!
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