Which risk increases when an alluvial river's sediment load is drastically reduced by upstream dam construction?

💡 Explanation

When sediment load decreases, the river's erosive power on the bed and banks increases because there's less sediment to carry, leading to more downcutting and lateral erosion. Therefore riverbank erosion accelerates downstream, rather than aggradation, fertility or decreased subsidence, which require sediment deposition.

• Which risk increases when prolonged carbonic acid forms?
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• Which outcome occurs when subsurface pressure exceeds frictional strength along a fault?
• Which factor drives oxbow lake formation disproportionately during glacial retreats?
• Which mechanism creates the rain shadow effect on the leeward side of a mountain range?
• Which long-term outcome results when glacial melt decreases the settling velocity in meltwater streams?