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← GeographyWhich mechanism primarily contributes to increased sedimentation rates when straightening a meandering river nearing oxbow stage?
A)Increased channel gradient and flow velocity✓
B)Enhanced vegetation cover within floodplain
C)Reduced sediment trapping in cutoffs
D)Decreased bank erosion from reduced sinuosity
💡 Explanation
When a meandering river is straightened approaching oxbow formation, the channel gradient increases causing the flow velocity to increase because the water travels a shorter distance down a steeper slope raising the stream energy, therefore increased channel gradient and flow velocity accelerates deposition, rather than alternative vegetation, trapping and errosion balances which relate to undisturbed rivers.
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