Which flow regime change occurs during alluvial terrace formation?

💡 Explanation

Base level changes encourage or discourage the downcutting action of a river; it is captured by the mechanism of stream rejuvenation. This happens because a drop in base level increases the stream's gradient and thereby, its erosive power; therefore increased vertical erosion, rather than sediment deposition, forms terraces.

• Which topographic outcome results when acidic groundwater flows through limestone?
• Which risk increases when rapidly flowing volcanic lava transitions facies?
• Which risk is amplified where deforestation occurs upstream of an alluvial plain undergoing heavy monsoon rainfall?
• Which risk increases for coastal communities when extensive seawall construction prevents sediment deposition?
• Which process inhibits primary succession after extensive pyroclastic flow?
• Which consequence results when extensive hydraulic mining unearths large loess deposits?