Research Article
Mar 1974
Two-Dimensional Analysis of Backwater at Bridges
Publication: Journal of the Hydraulics Division
Volume 100, Issue 3
Abstract
A two-space dimensional mathematical model of computing steady flow distributions and water levels near contractions in natural waterways (e.g., highway bridges) is developed. The two-dimensional model provides a theoretical basis for such one-dimensional concepts as expansion losses by accounting for all losses by friction along properly located two-dimensional streamlines. The finite element solution algorithm locates these streamlines and integrates energy loss due to friction along them. Stagnation zones downstream from contractions can be predicted and located by the algorithm. A necessary condition for separation is that the velocity head at the point of separation exceeds head loss due to friction along some possible path for a free streamline. The absence of separation which is associated with scouring currents along the downstream side of bridge approach embankments can be predicted where the necessary condition is not satisfied.
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Published In
Journal of the Hydraulics Division
Volume 100 • Issue 3 • March 1974
Pages: 379 - 392
Copyright
© 1974 American Society of Civil Engineers.
History
Published in print: Mar 1974
Published online: Feb 3, 2021
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J. Thomas Franques, M.ASCE
Asst. Prof., Dept. of Structures, Materials, Fluids, Univ. of South Florida, Tampa, Fla
Dannial W. Yannitell
Assoc. Prof., Louisiana State Univ., Baton Rouge, La
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.