Which risk increases for structures founded upon unstable alluvial soils?

💡 Explanation

Subsidence risk increases because alluvial soils are unconsolidated. The mechanism is compaction. Compaction reduces volume under load, therefore settlement occurs, rather than other effects like liquefaction because that involves rapid shaking during seismic events.

• Which erosional outcome is accelerated when cryoturbation destabilizes a cirque headwall?
• Which outcome occurs when groundwater calcium carbonate saturation decreases near stalactites?
• Which outcome occurs when seasonal wave energy increases along a coastal island system?
• Which mechanism causes the prevailing surface wind direction in temperate zones to be westerly rather than directly poleward?
• Which localized outcome commonly occurs due to coastal upwelling?
• Reduced river sediment load increases which effect via karst?