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← GeographyWhich outcome occurs when reduced sediment supply alters wave refraction?
A)Accelerated downdrift erosion, less stable coast✓
B)Increased deposition, expanded beach width
C)Uniform sedimentation, predictable beach profiles
D)Enhanced storm surge barrier island resilience
💡 Explanation
When sediment supply decreases along a coastline, wave refraction focuses energy on previously stable areas via wave diffraction because existing landforms are no longer maintained by longshore drift. Therefore erosion accelerates, rather than stabilizes, the coastline profile.
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