I don’t know, but here’s one perspective.
The Mississippi river has to be dredged continuously to allow deep draught ships to come up river to the port. The dredging includes the delta area where the river exits into the Gulf. Otherwise, sediment buildup would prevent ships from entering.
So, parts of the marshes are getting dredged anyway just to allow the port to operate.
true and in this case dredging is for protection..even more important