Which risk increases when an alluvial river channel is artificially straightened along its floodplain?

💡 Explanation

When a meandering alluvial river is straightened, the river's gradient increases, increasing its flow velocity and sediment transport capacity because the channel length is reduced. Therefore channel bed erosion amplification results, because the force exerted increases, rather than deposition, subsidence, or attenuation which require reduced flow velocity.

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