Which risk increases when construction on an alluvial fan restricts sediment flow from upstream?

💡 Explanation

When sediment flow from upstream is restricted on an alluvial fan, channel avulsion becomes more frequent because reduced deposition leads to increased gradients and flow instability exceeding the critical threshold. Therefore increased channel avulsion is a risk, rather than decreased subsidence, enhanced soil fertility or reduced liquefaction potential which involve reverse effects.

• Which process causes increased methane release from Arctic slopes experiencing thermokarst?
• Which outcome occurs when sediment pore pressure reduces during subduction?
• Which outcome occurs when groundwater salinity inhibits deep bioturbation?
• Which risk increases along riverbanks composed of unconsolidated silty alluvial deposits?
• Which process causes oxbow lake blockage when sediment supply increases within a floodplain system?
• Which effect results when acid rock drainage reduces amphibian activity in wetlands?