Por favor, use este identificador para citar o enlazar este ítem: http://repositorio.udec.cl/jspui/handle/11594/3251
Título : Socavación local y sedimentación alrededor de cepas de puente durante crecidas.
Otros títulos : Local Scour and Deposition at Bridge Piers during Floods.
Autor : Link Lazo, Óscar Eduardo
García Medel, Marcelo Javier
Palabras clave : Socavación en Puentes - Modelos Matemáticos;Socavación (Ingeniería Hidráulica) - Modelos Matemáticos;Puentes - Erosión - Modelos Matemáticos
Fecha de publicación : 2018
Editorial : Universidad de Concepción.
Resumen : better understanding of the bridge pier scour caused by flood waves is expected to allow a different design approach based on the expected scour depth caused by one hydrological event in combination with appropriate monitoring and maintenance of pier foundations, having risk levels of comparable magnitude to the current approach, which considers a worst case scenario represented by the hundred years recurrence discharge over a theoretically infinite duration. The present Thesis aims at investigating the effects of different flow and sediment regimes (regulated and unregulated discharges with or without excess sediment supply) on local scour at a bridge pier. Concurrent field measurements of maximum scour depth, flow depth, and flow velocity were performed during six days at the Rapel bridge, over the Rapel river, located in Central Chile. During the measurements, river discharge was regulated by the operation of a hydropower plant, with hydropeaking. A model of scour and deposition is proposed, and field measurements are used to estimate optimal model parameters and to evaluate model performance. The model was applied to pre and post-dam scenarios to compare expected scour caused by a natural flow regime and by hydropeaking considering different excess sediment supply. Results show that a single measurement of scour evolution during one flood was enough for estimation of optimal model parameters. The calibrated model reproduced measured scour and deposition in a verification case with high precision. The model application showed that scour and deposition are very sensitive to the excess sediment supply: after two years, scour resulted higher in the pre-dam scenario than in the post-dam scenario when no sediment deposition or equilibrium conditions occurred, while it was lower in case of excess sediment supply. However, in the pre-dam scenario with excess sediment supply the highest scour depths were of comparable magnitude as those after the two years, and occurred only briefly around the peak discharges before sediment deposition, illustrating the complex interactions between flow and sediment in time, with important consequences for monitoring of bridge pier scour in the field and for forensic analyses.
Descripción : Magister en Ciencias de la Ingeniería, mención en Ingeniería Civil Universidad de Concepción 2018
URI : http://repositorio.udec.cl/jspui/handle/11594/3251
metadata.dc.identifier.other: 238069
Aparece en las colecciones: Ingeniería Civil - Tesis Magister

Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
Tesis_Socavacion_local_y_sedimentacion.Image.Marked.pdf1,47 MBAdobe PDFVista previa
Visualizar/Abrir


Este ítem está sujeto a una licencia Creative Commons Licencia Creative Commons Creative Commons