Time evolution of the flow characteristics around bridge abutments during scouring process

Download

index.pdf

Date

2014

Author

Yıldız, Burhan

Metadata

Show full item record

Item Usage Stats

201
views

129
downloads

This study involves numerical and experimental investigation of the velocity field and the time evolution of the scour pattern forming around bridge abutments. The experimental part of the study includes velocity field recordings by using an ADV device and eroded bed bathymetry measurements by an ultrasonic ranging system. Using the ADV measurements; the velocity components, the upstream part of the primary vortex and the change of downstream recirculation region dimensions by the change in abutment length, type and closeness to the channel bed was investigated. Scour recording part of the experimental study included scour pattern recordings for various abutment lengths, types and experiment durations; and continuous measurements of scour at some predefined sections around abutments for eight hours. Maximum scour depth, scour hole dimensions and scour volume are related to scour time and abutment length. It was observed that, the contraction scour occurs together with the local scour at contraction ratios larger than 15-20% depending on the abutment type. The second part of the study includes a numerical analysis of the problem by using a commercially available CFD software. The numerical analysis consisted of simulations both for non-erodible and erodible channel bed conditions. The capability of the scour model of the software was tested.

Subject Keywords

Bridges, Scour at bridges., Scour (Hydraulic engineering)., Hydraulics.

URI

http://etd.lib.metu.edu.tr/upload/12617014/index.pdf
https://hdl.handle.net/11511/23405

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Analysis of experimental data sets for local scour depth around bridge abutments using artificial neural networks Tiğrek, Şahnaz; Şarlak, Nermin (Academy of Science of South Africa, 2011-10-31) The performance of soft computing techniques to analyse and interpret the experimental data of local scour depth around bridge abutment, measured at different laboratory conditions and environment, is presented. The scour around bridge piers and abutments is, in the majority of cases, the main reason for bridge failures. Therefore, many experimental and theoretical studies have been conducted on this topic. This study sought to answer the following questions: Firstly, can data collected by different researc...
Numerical simulation of scour at the rear side of a coastal revetment Şentürk, Barış Ufuk; Guler, Hasan Gokhan; Baykal, Cüneyt (2023-05-01) This paper presents the results of a numerical modeling study on the scouring of unprotected rear side material of a rubble mound coastal revetment due to the overtopping of solitary-like waves utilizing a coupled hydro-morphodynamic computational fluid dynamics (CFD) model. Three cases having various wave heights are tested with six different turbulence models together with different wall functions. The hydrodynamic results (free-surface elevations, overtopping volumes, and jet thicknesses) and morphologic...
Modeling temporal variation of scouring at dual bridge piers Selamoğlu, Meriç; Yanmaz, Ali Melih; Köken, Mete; Department of Civil Engineering (2015) Computation of temporal evolution of scour depth around bridge piers is essential for the efficient design of bridge pier footings. In this thesis, empirical scour-prediction equations and a semi-empirical model are developed to predict the temporal variation of maximum clear-water scour depth at dual cylindrical uniform piers with identical size in tandem arrangement. Experiments are conducted using different pier size, pier spacing, and flow intensities. The semi-empirical model is based on sediment conti...
Investigation of flow and scour around head of a vertical wall breakwater Karakaş, Kadir; Baykal, Cüneyt; Department of Civil Engineering (2019) In this study, wave induced hydrodynamic and morphodynamic processes around the head of a vertical wall breakwater are investigated by numerical and physical modeling. An open source computational fluid dynamics code was used to investigate the flow around the head of structure. The code solves incompressible Reynolds-Averaged Navier-Stokes equations with a k-omega turbulence closure. For investigating flow and scour around the structure, small-scale physical model tests were carried out in the random wave ...
Effect of Pier Inclination Angle on Local Scour Depth Around Bridge Pier Groups Bozkuş, Zafer; DINCER, A. Ersin (2018-10-01) The primary objective of this study is to investigate experimentally local scours around bridge pier groups at various inclination angles of piers and also to develop empirical local scour depth equations. In the study, two bridge pier groups are used. In each pier group, the most upstream and downstream piers are placed in an inclined manner at 10 degrees and 15 degrees. The vertical case was also employed for comparison purposes. Seventy-two experiments each lasting 6 h are conducted under uniform-flow an...

Citation Formats

B. Yıldız, “Time evolution of the flow characteristics around bridge abutments during scouring process,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.