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Jul 15 2011

What Does Clear Water Scour at a Bridge Pier Look Like?

This is a video of a model of a cylindrical bridge pier under gradually higher and higher flows with what appears to be gravel sized bed sediment.

 

The modeled situation here is of clear water scour, which is more common with a channel bed of coarser grained sediment. The other type of pier scour is live bed scour, in which the bed material upstream is in motion (not just at the pier). With clear water scour, the scour hole is usually left intact after the flood recedes while in a live bed situation, the scour hole may refill while the flood recedes.

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