I doubt Taylor dispersion enters into it. You might want to rethink how powerful Bernoulli's effect really is. The pressure transverse to the flow is reduced in direct relation to the increased dynamic pressure in the direction of flow. In the case of a stream in middle of a river, the center...
Additional information is that a wave train develops during large flows of rivers, downriver from large chutes where most of the water is directed over rapids or falls. So there is something going on that makes the surface of the water mound up due to something other than obstructions. The...
Does the top of a flowing river curve convex because of Bernoulli's Principle?
I was looking at a picture of a flooding river on Google Earth, and noticed that most of the debris was concentrated in a line down the middle of the river, corresponding to the area of most rapid flow. I know...