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Sediment motion in abutment scour (1)

When an obstacle is placed in a flow on an erodible bed, a scour hole forms at the footing of the obstacle. On river beds, this phenomenon typically occurs in the vicinity of bridge piers and/or abutments, often leading to the structure collapse.
The movie shows the scour activation at a rectangular abutment (vertical plate). The experiment was performed in the Politecnico di Milano, in a pressurized duct filled with plastic sediments. Erosion of the bed commences at the abutment nose (where the maximum erosion depths are typically measured at the beginning of the process), then the area with high sediment motion enlarges both upstream and laterally. Observation of the sediment motion highlights the effect of the turbulent flow field upstream of the abutment, and the presence of the recirculating wake downstream of it.

Additional notes
More movies can be found on the web site of the Hydraulic Engineering Dept. of the Politecnico di Milano:http://www.diiar.polimi.it/idra/progetto.asp?id=5.
Politecnico di Milano, Dept. I.I.A.R., Milan, Italy Source: Ballio F., Radice A., Malavasi S. (2006), "Sediment motion in local bridge scour", DVD with experimental results of abutment scour experiments.

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This web site was launched by Prof. Michele Mossa of the Polytechnic University of Bari (Italy) with the initial support of Fondazione Caripuglia, Bari, Italy for the Research Project LIC-MON of 2003 and of the Project IMCA (Integrated Monitoring of Coastal Areas) financed by MIUR PON D.M. 593/00. Later, the initiative was supported with other Prof. Michele Mossa’s funds, most recently provided by the RITMARE Project.

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