The river meandering is due to secondary flows, and if I may add its due to fluid distortion caused by vortex stretching.
Proof: Look at a 'new' (relatively new river=50-60 yrs old) and compare it with a very old river (may be like 400 yrs old), you will know what I'm taking.
New River
Old River
Again for the ignorant world: Vortex Stretching= (w.grad(u))
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