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Which outcome occurs when turbulent river flow exceeds certain Reynolds number?

A)Increased mixing of pollutants downstream
B)Decreased sediment erosion locally
C)Reduced energy dissipation overall
D)Laminar sublayer formation initiates quickly

💡 Explanation

Above a critical Reynolds number, transition to turbulence causes increased mixing because this enhanced chaotic advection dominates; therefore, pollutant dispersion increases rather than decreasing sediment erosion, which is affected by bed shear stress.

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