Submerged flow bridge scour under clear water conditions

Details

• Creators:
  Shan, Haoyin ; Xie, Zhaoding ; Bojanowski, Cezary ; Suaznabar, Oscar ; Lottes, Steven ; Shen, Jerry ; Kerenyi, Kornel
• Corporate Creators:
  Genex Systems, LLC
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• Subject/TRT Terms:
  • Bridge foundations
  • Hydraulics
  • Scour
  • Flow
  • Contraction
  • Bridge foundations
  • Bridge hydraulics
  • Bridge scour
  • Submerged flow
  • Pressure flow
  More +
• Publication/ Report Number:
  FHWA-HRT-12-034
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Laboratory report; May 2010-June 2012.
• Contracting Officer:
  Kerenyi, Kornel
• Corporate Publisher:
  Turner-Fairbank Highway Research Center
• Abstract:
  Prediction of pressure flow (vertical contraction) scour underneath a partially or fully submerged bridge superstructure ; in an extreme flood event is crucial for bridge safety. An experimentally and numerically calibrated formulation is ; developed for the maximum clear water scour depth in non-cohesive bed materials under different approach flow and ; superstructure inundation conditions. The theoretical foundation of the scour model is the conservation of mass for ; water combined with the quantification of the flow separation zone under the bridge deck superstructure. In addition to ; physical experimental data, particle image velocimetry measurements and computational fluid dynamics simulations ; are used to validate assumptions used in the derivation of the scour model and to calibrate parameters describing the ; separation zone thickness. With the calibrated model for the separation zone thickness, the effective flow depth ; (contracted flow depth) in the bridge opening can be obtained. The maximum scour depth is calculated by identifying ; the total bridge opening that creates conditions such that the average velocity in the opening, including the scour depth, ; is equal to the critical velocity of the bed material. Data from previous studies by Arneson and Abt and Umbrell et al. ; are combined with new data collected as part of this study to develop and test the proposed formulation.
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• Format:
  PDF
• Funding:
  DTFH61-11-D-00010
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24983/dot_24983_DS1.pdf
• File Type:
  [PDF - 1.39 MB]
• Collection(s):
  Federal Highway Administration ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:5e8a7507a45b37757e8d09f520267b99d62a9ff9aabdc2d3ce623e7f14ddb302c757f7e85bfedd333a51268d06bfd51da32d8b21aea102bbcc0dd1c04c7bdc15