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Geography

Which downstream effect emerges when a stream's sinuosity hits its limit?

A)Increased rates of floodplain formation
B)Decreased sediment transport efficiency
C)River channel straightening (avulsion)
D)Enhanced formation of oxbow lakes

💡 Explanation

River avulsion follows because increased sinuosity boosts hydraulic radius, exceeding the stream's energy threshold needed for curvature maintenance, exhibiting channel straightening via cutoffs. Therefore straightened channel happens instead of floodplain growth because less energy is dissipated lateral erosion.

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