Which risk escalates when floodplains contain deep loess deposits?

💡 Explanation

Soil liquefaction increases because loess has low cohesion and high silt content, meaning the saturated soil loses strength under flood-induced stress, therefore increasing structure instability, rather than slower sedimentation which occurs anyway.

• Which risk increases for structures founded upon unstable alluvial soils?
• Which outcome occurs when sediment supply exceeds stream transport capacity near a mountain front, promoting widespread aggradation?
• Which outcome increases when prolonged drought accelerates deflation?
• Which risk markedly increases above limestone caverns when seasonal water tables surpass a critical saturation point?
• Which risk increases when rapid urbanization constricts a river channel with natural levees?
• Which outcome increases when subtropical gyre currents weaken?