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Published on Mar 1, 2012
The movie shows a part of the upstream side of the scour protection in plan-view. The pile is located in the upper right corner and the approach flow is from left to right as indicated. The blue dye is added upstream of the scour protection, while the green dye is added adjacent to the pile. The blue dye is washed in between the stones in the approach flow direction, while the green dye is washed in the opposite direction by the horseshoe vortex, as indicated by the blue and green arrows.