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Which phenomenon can occur downstream when river flow exceeds Reynold's limit?

A)Incipient cavitation bubble formation
B)Transition to turbulent flow regime
C)Increased laminar boundary layer thickness
D)Decreased hydraulic head gradient

💡 Explanation

Exceeding Reynold's number indicates inertial forces dominate because viscous forces cannot dampen perturbations, therefore turbulent flow initiates, rather than laminar; cavitation requires vapor pressure effects and hydraulic head concerns elevation pressures.

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