River avulsions increase dramatically when floodplain sedimentation is dominated primarily by which mechanism?

💡 Explanation

Differential compaction causes rapid elevation changes because finer materials compress drastically in alluvial plains. Channels rapidly relocate down steeper compaction gradients, therefore flooding and avulsion is more probable with unconsolidated floodplain alluvium, rather than other flow decreases alone.

• Near a volcanic island, which process dominates coastal erosion after repeated lava delta collapses?
• Which risk increases when longshore currents weaken along coasts?
• Which risk increases where a large, locked fault experiences episodic tremor and slip (ETS)?
• Which outcome accelerates sediment deposition near a lake?
• Which outcome primarily results from pedogenesis on basalt?
• Which consequence results when excessive groundwater extraction dewaters an aquifer near karst topography?