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← GeographyWhat hazard intensifies when alluvial fan stream channels downcut?
A)Debris flow avulsion frequency increases✓
B)Bank stabilization improves naturally
C)Aquifer recharge rates accelerate locally
D)Riparian vegetation biodiversity stabilizes easily
💡 Explanation
Debris flow avulsion risk intensifies downstream because downcutting creates unstable, elevated sediment aprons encouraging channel migration. Therefore, avulsion frequency increases, rather than causing river stabilization, improved local recharge, or easier vegetation establishment because of disturbance intensity.
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