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← GeographyWhich risk increases when sediment supply halts offshore breakwaters?
A)Increased wave energy behind structure
B)Increased scour behind the breakwater
C)Tombolo formation accelerates downdrift erosion✓
D)Rip current frequency near the breakwater
💡 Explanation
Tombolo formation focuses wave energy, accelerating downdrift erosion, because wave diffraction causes faster sediment transport towards structure, therefore erosion rates accelerate behind the tombolo feature, rather than affecting wave energy behind or rip currents.
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