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← GeographyWhich outcome results when the flow regime abruptly decreases in an alluvial river?
A)Increased colluvium deposition on hillslopes
B)Aggradation of the river channel bed✓
C)Enhanced chemical weathering of bedrock
D)Accelerated aeolian transport of silt
💡 Explanation
Aggradation occurs due to decreased sediment transport capacity. River competency diminishes, leading to Sedimentation/deposition of the alluvial load because the stream now has less energy; therefore, aggradation increases rather than erosion in the river channel.
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