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← GeographyWhich mechanism causes decreased river flow in braided channels downstream from an alluvial fan during seasonal shifts?
A)Hyporheic exchange reduction
B)Aggradation-driven channel avulsion✓
C)Evapotranspiration rate increase
D)Riparian vegetation water absorption
💡 Explanation
Aggradation-driven channel avulsion causes decreased flow by diverting water into newly formed channels, because sediment deposition raises the streambed, therefore forcing the river to seek new paths rather than relying upon the existing diminished channel capacity.
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