Scour which occurs as a result of a constriction in the water channel openings is called?

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Multiple Choice

Scour which occurs as a result of a constriction in the water channel openings is called?

Explanation:
When the flow channel becomes narrower, the whole reach experiences higher velocity and increased bed shear stress, causing sediment to be removed over a span of the channel rather than at a single point. That broad, reach-wide erosion is known as general scour (often called contraction scour). It contrasts with local scour, which is focused around individual structures like bridge piers or abutments, where vortices form right at those items. Bridge scour is the term usually used for erosion specifically around a bridge foundation, which is a form of local scour. So the scour caused by a channel constriction is general scour.

When the flow channel becomes narrower, the whole reach experiences higher velocity and increased bed shear stress, causing sediment to be removed over a span of the channel rather than at a single point. That broad, reach-wide erosion is known as general scour (often called contraction scour). It contrasts with local scour, which is focused around individual structures like bridge piers or abutments, where vortices form right at those items. Bridge scour is the term usually used for erosion specifically around a bridge foundation, which is a form of local scour. So the scour caused by a channel constriction is general scour.

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