Which outcome occurs when rapid aggradation chokes an alluvial channel?

💡 Explanation

Aggradation causes the alluvial riverbed to build, leading to the deposition of unstable sediment dams. This increases the likelihood of outburst floods because dam failure sends a pulse of water and sediment downstream, rather than a steady sediment supply.

• Which risk increases where coastal cliff erosion forms sea stacks?
• Which hazard is heightened as talik formation expands?
• Which outcome occurs when longshore drift encounters a significant bay?
• Which topographic outcome is enhanced with increased acidity?
• Which geographic outcome is accelerated by enhanced carbonic acid dissolution?
• Which risk increases when thawing permafrost destabilizes infrastructure foundations?