SIMPLE METHODS FOR ESTIMATING BACKWATER AND CONSTRICTION SCOUR AT BRIDGES AND ABRUPT ENCROACHMENTS

Analytic expressions for bridge backwater and constriction scour are presented for subcritical flow through five commonly occurring bridge crossings. To assess the effects of constriction scour on bridge backwater, a known cross-section technique is employed. Based on the analytic expressions, bridge backwater and constriction scour are numerically simulated over a wide range of flow conditions. Regression analysis is used to develop simplified explicit relations for bridge backwater as a function of Froude number, pier energy-loss coefficient, constriction ratio, and conveyance ratio. The resulting regression equations are sufficiently accurate for preliminary hydraulic analyses of bridge waterways in a feasibility study. Simplified expressions are not intended for detailed design analysis. Practical application of the simplified expressions is illustrated through a step-by-step design procedure. (Author)

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1983/922/922-008.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=SIMPLE+METHODS+FOR+ESTIMATING+BACKWATER+AND+CONSTRICTION+SCOUR+AT+BRIDGES+AND+ABRUPT+ENCROACHMENTS&author=S.+Taylor&author=H.+Shen&publication_year=1983
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309036119
• Supplemental Notes:
  • Publication of this paper sponsored by Committee on Hydrology, Hydraulics, and Water Quality. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Taylor, Stewart W
  • Shen, Hsieh Wen
• Publication Date: 1983

Media Info

• Media Type: Print
• Features: Figures; References;
• Pagination: pp 54-64
• Monograph Title: Improving Estimates from Flood Studies
• Serial:
  • Transportation Research Record
  • Issue Number: 922
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Backwaters; Bridge piers; Constrictions; Equations; Regression analysis; Right of way (Land); Scour; Simulation
• Old TRIS Terms: Encroachments
• Subject Areas: Data and Information Technology; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;

Filing Info

• Accession Number: 00382954
• Record Type: Publication
• ISBN: 0309036119
• Files: TRIS, TRB
• Created Date: Apr 30 1984 12:00AM