M1Q4

A culvert runs in inlet control when ...

Question

M1Q4

A culvert runs in inlet control when ...

BlackTom AI · Accepted Answer

Question recap: A culvert runs in inlet control when ...
Option 1: 'the water flow in the barrel is subcritical' Inlet control occurs when the flow is controlled by the entrance conditions, typically at a high head, but subcritical flow at the inlet alone does not define inlet control; this option misstates the critical condition for inlet control.
Option 2: 'the inlet is submerged but the outlet is free' Submergence at the inlet can affect whether inlet control or outlet control governs the flow, but simply having a submerged inlet with a free outlet does not by itself define inlet control; this mixes boundary conditions without stating the essential supercritical condition at the barrel.
Option 3: 'the water flow in the barrel is supercritical' This is the key characteristic of inlet control: the flow is governed by the inlet conditions when the flow in the culvert is supercritical, meaning the velocity and energy grade line are such that the inlet determines the discharge regardless of downstream conditions.
Option 4: 'both inlet and outlet are free' If both ends were free, other control regimes would apply, but this description does not accurately capture the criterion for inlet control; it conflates boundary freedom with the governing mechanism, making it an incorrect generalization.
Summary: The correct concept hinges on the flow inside the culvert being supercritical, which means the inlet conditions prevail and control the discharge. The other options either describe wrong flow regimes (subcritical), misstate boundary conditions (submerged inlet with free outlet), or introduce an inaccurate universal for both ends being free. Therefore, the option stating 'the water flow in the barrel is supercritical' correctly identifies inlet control.

M1Q4 A culvert runs in inlet control when ...单项选择题

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