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← GeographyWhich downstream effect of prolonged high-volume flows typically initiates alluvial fan stream incision?
A)Decreased sediment transport capacity✓
B)Increased channel bank stabilization
C)Vegetation growth on the fan
D)Elevated groundwater table feedback
💡 Explanation
Decreased flow competence reduces sediment transport; therefore, larger particles cannot be moved, causing aggradation and increased stream slope via the mechanism of sediment deposition. This increases sediment deposition rates; alluvial fan streams incise rather than experience lateral widening because of enhanced deposition.
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