This research intends to provide new insights on sediment transport at bridges exploring the features of migrating dune-like bedforms generated immediately behind piers or abutments by local scour processes. The extended VAW laboratory dataset collected from 1999 to 2002 was therefore analyzed. In total, 63 temporal runs involving 480 observations for cylindrical piers, and 54 runs with 384 observations for rectangular-shaped abutments were considered. It was found that the main dimensionless parameters governing the dune processes are the relative pier diameter (or abutment width), the densimetric Froude number, the wash-out parameter, and relative time. The dune height is mainly controlled by the relative width of the scour element while its relative length depends on the wash-out parameter. The morphologic dune evolution and its downstream propagation are described using straightforward equations as a function of the key parameters. The results apply to practice and are suitable to assess the performance of computational modeling.

Morphological evolution of dune-like bed forms generated by bridge scour

OLIVETO, Giuseppe;
2014-01-01

Abstract

This research intends to provide new insights on sediment transport at bridges exploring the features of migrating dune-like bedforms generated immediately behind piers or abutments by local scour processes. The extended VAW laboratory dataset collected from 1999 to 2002 was therefore analyzed. In total, 63 temporal runs involving 480 observations for cylindrical piers, and 54 runs with 384 observations for rectangular-shaped abutments were considered. It was found that the main dimensionless parameters governing the dune processes are the relative pier diameter (or abutment width), the densimetric Froude number, the wash-out parameter, and relative time. The dune height is mainly controlled by the relative width of the scour element while its relative length depends on the wash-out parameter. The morphologic dune evolution and its downstream propagation are described using straightforward equations as a function of the key parameters. The results apply to practice and are suitable to assess the performance of computational modeling.
2014
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/62263
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