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Control of Scour at Bridge Piers by a Downstream Bed Sill |
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| Authors: | Carmelo Grimaldi Roberto Gaudio Francesco Calomino António H. Cardoso |
| Affiliation: | 1Dipartimento di Difesa del Suolo “V. Marone,” Università della Calabria, Ponte P. Bucci, Cubo 42b, 87036 Rende (CS), Italy. E-mail: carmelogrimaldi@yahoo.it 2Dipartimento di Difesa del Suolo “V. Marone,” Università della Calabria, Ponte P. Bucci, Cubo 42b, 87036 Rende (CS), Italy. E-mail: gaudio@unical.it 3Dipartimento di Difesa del Suolo “V. Marone,” Università della Calabria, Ponte P. Bucci, Cubo 42b, 87036 Rende (CS), Italy. E-mail: calomino@dds.unical.it 4Departamento de Engenharia Civil e Arquitectura, Instituto Superior Técnico, Avenida Rovisco Pais, 1, 1049-001 Lisboa, Portugal. E-mail: ahc@civil.ist.utl.pt |
| Abstract: | Results are presented from laboratory experiments to investigate the effectiveness of bed sills as countermeasures against local scouring at a smooth circular bridge pier, for flow conditions near the threshold of uniform sediment motion. The bed sill was located downstream of the pier, and its effectiveness with the distance between pier and sill was evaluated. The dependence of the scour depth on different dimensionless groups was defined. The results showed that a bed sill placed at a short distance downstream of the pier reduces the scour depth, area, and volume. In particular, the smaller the distance between the two structures, the larger the effectiveness of the countermeasure. The bed sill seems to take effect some time after the beginning of the test, as the scour hole downstream of the bridge pier develops sufficiently and interacts with the countermeasure. |
| Keywords: | Scour Bridges Piers Experimentation |