Which effect accelerates river avulsion on a broad alluvial plain with high sediment load?

💡 Explanation

When sediment load overwhelms the river's erosive power, aggradation occurs because sediment deposition raises the channel bed, decreasing flow capacity and increasing flood frequency, prompting a shift to a new, lower path. Therefore, aggradation increases avulsion risk, rather than lateral erosion, vegetative stabilization, or isostatic rebound which have opposing or unrelated effects.

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