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← GeographyWhich outcome occurs when sediment discharge exceeds capacity in distributive fluvial systems?
A)Alluvial fan lobe switching develops✓
B)Channel avulsion decreases sharply
C)Suspended sediment concentration declines severely
D)Entrenchment of main channel results
💡 Explanation
Alluvial fan aggradation occurs. Increased sediment load causes **deposition**, because the carrying capacity is exceeded; therefore, a new lobe develops through lobe switching, rather than continued deposition in the current channel.
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