What geological example illustrates accretion as a reciprocal process to erosion along a river channel?

Answer

The deposition of sediment on a slower-moving bank downstream

Riverine accretion is often reciprocal to erosion; sediment that is stripped away from one area of the bank by fast water flow is frequently deposited onto another area where the flow is slower.

What geological example illustrates accretion as a reciprocal process to erosion along a river channel?
Geologyprocessplanetmassaccretion