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Time-Averaged Turbulent Velocity Flow Field through the Various Bridge Contractions during Large Flooding

1
Korea Institute of Civil Engineering and Building Technology, Goyang 10223, Korea
2
School of Urban and Civil Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul 04066, Korea
3
Department of Civil and Environmental Engineering, West Virginia University, 1306 Evansdale Drive, Morgantown, WV 26506, USA
*
Author to whom correspondence should be addressed.
Water 2019, 11(1), 143; https://doi.org/10.3390/w11010143
Received: 18 December 2018 / Revised: 8 January 2019 / Accepted: 11 January 2019 / Published: 15 January 2019
(This article belongs to the Special Issue Advances in Hydraulics and Hydroinformatics)
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Abstract

Extreme rainfall events, larger than 500-year floods, have produced a large number of flooding events in the land and also close to the shore, and have resulted in massive destruction of hydraulic infrastructures because of scour. In light of climate change, this trend is likely to continue in the future and thus, resilience, security and sustainability of hydraulic infrastructures has become an interesting topic for hydraulic engineering stakeholders. In this study, a physical model experiment with a geometric similarity of the bridge embankments, abutments, and bridge deck as well as river bathymetry was conducted in a laboratory flume. Flow conditions were utilized to get submerged orifice flow and overtopping flow in the bridge section in order to simulate extreme hydrologic flow conditions. Point velocities of the bridge section were measured in sufficient details and the time-averaged velocity flow field were plotted to obtain better understandings of scour and sediment transport under high flow conditions. The laboratory study concluded that existing lateral flow contraction as well as vertical flow contraction resulted in a unique flow field through the bridge and the shape of velocity profile being “fuller”, thereby increasing the velocity gradients close to the bed and subsequently resulting in a higher rate of bed sediment transport. The relationships between the velocity gradients measured close to the bed and the degree of flow contraction through the bridge are suggested. Furthermore, based on the location of maximum scour corresponding to the measured velocity flow field, the classification of scour conditions, long setback abutment scour and short setback abutment scour, are also suggested. View Full-Text
Keywords: abutment; overtopping flow; pressure flow; physical hydraulic modeling; scour and velocity field abutment; overtopping flow; pressure flow; physical hydraulic modeling; scour and velocity field
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yoon, K.S.; Lee, S.O.; Hong, S.H. Time-Averaged Turbulent Velocity Flow Field through the Various Bridge Contractions during Large Flooding. Water 2019, 11, 143.

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