Which process rapidly alters river delta morphology when coarse alluvial sediment deposition reduces flow capacity?

💡 Explanation

When excessive alluvial sediment reduces flow capacity, avulsion occurs as the river seeks a steeper, more efficient path, abandoning the original channel. Therefore, avulsion driving channel relocation results, because erosion maintains existing paths, subsidence lowers elevation, and isostatic rebound elevates regions.

• Which consequence results when wave-supported abrasion weakens coastal cliffs?
• Which mechanism exacerbates flood risk when constructing buildings within an alluvial fan?
• Which risk markedly increases within deep karst caves upon prolonged, widespread surface pavement?
• Which mechanism causes an avulsion event when a river's levee system is overwhelmed by sediment deposition?
• Which coastline transformation occurs with high sediment longshore drift?
• Which risk increases when porous alluvial aquifers are rapidly depleted by irrigation pumping?