Thank you for the question.
I know you are speaking downstream of Montreal in your case. We're upstream. Again, it is a site-specific phenomenon. It makes sense to look at all the sources. Certainly it has been observed downstream of Montreal that the very large drawdown and surge are significant sources. What you are saying doesn't surprise me, to be honest.
Upstream of Montreal, again, the ship wake is enough to mobilize sediments, so it is reasonable to suppose that it contributes. The question is to what degree.