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Contraction and Abutment Scour in Relief Bridges in a Flood Plain
The magnitude and duration of the Paraná river flood (Argentina) occurred in 1982/83, produced a very important increase in the discharge that flowed through the valley of the river. So, the flows that the relief bridges had to discharge, were much higher than the corresponding to the design section of the bridges. Then, very important scour occurred in these bridges, and many of them were destroyed by the flood. The field data measured during the flood, and their contrast with the computed erosion, gave the first evidences about the existing interrelation between the different types of erosion in relief bridees, and their bonds with the characteristic of the flow. Based on the field data, two sequences of laboratory experiments were carried out. The first sequence of experiments was developed in a mobile sand bed to evaluate the changes in the discharge distribution as a consequence of the occurrence of the abutment scour, and their influence on the contraction erosion. The second experiment sequence was designed to evaluate the influence of the width on the changes in the discharge distribution. The experimental study shows that the relief bridges in flood valleys, with a small width, require a special procedure to evaluate the total erosion, where the local scour must be computed before the contraction erosion. When the relief bridges have a large width, it is not necessary to use this sequence.
Contraction and Abutment Scour in Relief Bridges in a Flood Plain
The magnitude and duration of the Paraná river flood (Argentina) occurred in 1982/83, produced a very important increase in the discharge that flowed through the valley of the river. So, the flows that the relief bridges had to discharge, were much higher than the corresponding to the design section of the bridges. Then, very important scour occurred in these bridges, and many of them were destroyed by the flood. The field data measured during the flood, and their contrast with the computed erosion, gave the first evidences about the existing interrelation between the different types of erosion in relief bridees, and their bonds with the characteristic of the flow. Based on the field data, two sequences of laboratory experiments were carried out. The first sequence of experiments was developed in a mobile sand bed to evaluate the changes in the discharge distribution as a consequence of the occurrence of the abutment scour, and their influence on the contraction erosion. The second experiment sequence was designed to evaluate the influence of the width on the changes in the discharge distribution. The experimental study shows that the relief bridges in flood valleys, with a small width, require a special procedure to evaluate the total erosion, where the local scour must be computed before the contraction erosion. When the relief bridges have a large width, it is not necessary to use this sequence.
Contraction and Abutment Scour in Relief Bridges in a Flood Plain
Schreider, Mario (author) / Scacchi, Graciela (author) / Franco, Felipe (author) / Romano, Carlos (author)
Wetlands Engineering and River Restoration Conference 2001 ; 2001 ; Reno, Nevada, United States
2001-09-28
Conference paper
Electronic Resource
English
Argentina , Restoration , Ecosystems , Bridges , Rivers and streams , Flood plains , Scour , Wetlands
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