If with a zero turn radius, these ships are in excess of 1000ft long...you need a lot of clearance and a large radius just because of the physical dimensions (and so you know, we don't get a second ship wedged sideways in the canal.
We're talking about digging a diversionary channel. Making either end of that where it connects to the current channel wider to accommodate turning is trivial in comparison.
Probably very complicated since you couldn't have people in close. What if, as is not unlikely, part of the bank suddenly crumbles and the boat shifts?
Also, I doubt the sand goes down very deep...this is a costal area, not rolling dunes. You're going to hit rock quickly.
