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← GeographyWhich outcome occurs when sediment supply fluctuates heavily in an alluvial fan system fed by glaciofluvial till?
A)Avulsion frequency increases substantially downstream✓
B)Downcutting of the main feeder channel lessens
C)Lateral migration proceeds at constant rates
D)Decreased channel sinuosity near fan apex
💡 Explanation
Increased sediment fluctuations will overload transport capacity. This increases the frequency of avulsion (channel jumping) by Stream Piracy because channels seek steeper, more efficient routes. Therefore, avulsion rates increase downstream, rather than stability or simple migration under steady flows.
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