Why do different banks of meanders in rivers flow at different speeds?

Question

“In a meander section of a body of water, the outside of the bend will flow faster than the centre or the inside of a river’s meander.” What is the cause of this?

Answer 1

It has to be a matter of the water's momentum, the slope of the riverbed, the friction of the water with the riverbed, the rate of flow, and similar physical characteristics of the river.

Here's my first guess at a simple explanation: As the water makes the turn the water on the outside of the turn has a longer path around the curve, and the water on the inside has a shorter path. If the water on the outside did NOT move faster, then it would not keep up with the water further downstream, resulting in a space between the water going around the outside of the curve and the water further downstream.

Such a space would represent a shallow area in front of the water going around the outside of the curve. If this were to happen, that water would flow forward (and downhill) into the shallower area, which means it would accelerate and would flow faster than the rest of the river as it goes around the bend.

On the other hand, the water on the inside of the curve will tend to back up as it traverses the shorter distance at the inside of the curve. This causes it to slow down.

That's my interpretation.

Answer 2

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Answer 3

Hydraulics.