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 mechanism most directly weakens the Atlantic Meridional Overturning Circulation (AMOC) when Greenland's ice sheet melts?
• Which topographic outcome occurs when permafrost thawing triggers widespread solifluction on a hillside?
• Which mechanism fundamentally controls soil horizon differentiation during alpine pedogenesis?
• Which process limits the height of stratovolcanoes formed at subduction zones?
• Which deformation threat arises from saturated permafrost thaw?
• Which outcome results when aseismic creep is interrupted?