Scour around Bankline and Setback Abutments in Compound Channels
Publication: Journal of Hydraulic Engineering
Volume 132, Issue 1
Abstract
Prediction of bridge abutment scour is particularly difficult in compound channels because of the effects of the flow interaction between the floodplain and main channel superimposed on the flow obstruction, and contraction caused by the bridge abutment and highway embankment. Previous laboratory studies have focused on rectangular channels, although it is generally recognized that compound channels can have an additional geometric influence on the maximum clear-water scour depth. It is the purpose of this paper to integrate experimental results for clear-water abutment scour for different compound channel geometries by taking into account the flow redistribution that occurs between floodplain and main channel in the contracted section created by the bridge opening. In addition, sediment size, bridge backwater, abutment shape, and approach velocity and depth are included in a proposed scour depth relationship. Both setback and bankline abutments are considered. Experimental evidence is presented for the characteristic nonuniform lateral velocity distributions associated with compound channels in the bridge approach section as affected by backwater, and for the entrainment of floodplain flow into the main channel between the approach and bridge opening cross sections. Scour depth patterns are shown as remnants of the floodplain flow acceleration and entrainment process. It is demonstrated that a common relationship for scour depth can be developed for both setback and bankline abutments provided that a consistent definition of scour depth is utilized. The experimental results are applied successfully to a field case of measured abutment scour, but the need for additional high-quality, real-time field data is emphasized.
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Acknowledgment
This research was partially supported by FHwA Contract DTFH61-94-C-00198.
References
Biglari, B., and Sturm, T. W. (1998). “Numerical modeling of flow around bridge abutments in compound channel.” J. Hydraul. Eng., 124(2), 156–164.
Cardoso, A. H., and Bettess, R. (1999). “Effects of time and channel geometry on scour at bridge abutments.” J. Hydraul. Eng., 125(4), 388–399.
Carstens, M. R. (1966). “Similarity laws for localized scour.” J. Hydraul. Div., Am. Soc. Civ. Eng., 92(3), 13–36.
Chrisohoides, A., Sotiropoulos, F., and Sturm, T. W. (2003). “Coherent structures in flat-bed abutment flow: Computational fluid dynamic simulations and experiments.” J. Hydraul. Eng., 129(3), 177–186.
Coleman, S. E., Lauchlan, C. S., and Melville, B. W. (2003). “Clear-water scour development at bridge abutments.” J. Hydraul. Res., 41(5), 521–531.
Ettema, R. (1980). “Scour at bridge piers.” Rep. No. 216, School of Engrg., Univ. of Auckland, Auckland, New Zealand.
Froehlich, D. C. (1989). “Local scour at bridge abutments.” Proc., National Conference on Hydraulic Engineering, ASCE, New York, 13–18.
Kindsvater, C. E., and Carter, R. W. (1955) “Tranquil flow through open-channel constrictions.” Trans. Am. Soc. Civ. Eng., 120, 955–980.
Laursen, E. M. (1963). “Analysis of relief bridge scour.” J. Hydraul. Div., Am. Soc. Civ. Eng., 89(3), 93–118.
Melville, B. W. (1992). “Local scour at bridge abutments.” J. Hydraul. Eng., 118(4), 615–631.
Melville, B. W. (1995). “Bridge abutment scour in compound channels.” J. Hydraul. Eng., 121(12), 863–868.
Melville, B. W. (1997). “Pier and abutment scour: Integrated approach.” J. Hydraul. Eng., 123(2), 125–136.
Melville, B. W., and Chiew, Y. M. (1999). “Time scale for local scour at bridge piers.” J. Hydraul. Eng., 125(1), 59–65.
Melville, B. W., and Coleman, S. E. (2000). Bridge scour, Water Resources, Highlands Ranch, Colo.
Morris, J. L., and Pagan-Ortiz, J. E. (1999). “Bridge scour evaluation program in the United States.” Stream stability and scour at highway bridges, E. V. Richardson and P. F. Lagasse, eds., ASCE, Reston, Va., 61–70.
Mueller, D. S., and Hitchcock, H. A. (1998). “Scour measurements at contracted highway crossings in Minnesota, 1997.” Proc., Water Resources Engineering ’98, ASCE, Reston, Va., 210–215.
Myers, R. C., and Lyness, J. F. (1997). “Discharge ratios in smooth and rough compound channels.” J. Hydraul. Eng., 123(3), 182–188.
Oliveto, G., and Hager, W. H. (2002). “Temporal evolution of clear-water pier and abutment scour.” J. Hydraul. Eng., 128(9), 811–820.
Pagan-Ortiz, J. E. (1991). “Stability of rock riprap for protection at the toe of abutments located at the floodplain.” Rep. No. FHWA-RD-91-057, U.S. Dept. of Transportation, Federal Highway Administration, Washington D.C.
Pagan-Ortiz, J. E. (1998). “Status of the scour evaluation of bridges over waterways in the United States.” Proc., Water Resources Engineering ’98, ASCE, Reston, Va., 2–4.
Parola, A. C., Hagerty, D. J., and Kamojjala, S. J. S. (1998). “Highway infrastructure damage caused by the 1993 Upper Mississippi River Basin flooding.” NCHRP Report 417, National Cooperative Highway Research Program, National Academy Press, Washington, D.C.
Richardson, E. V., and Davis, S. R. (2001). Evaluating scour at bridges, 4th Ed., HEC-18, Federal Highway Administration, U.S. Dept. of Transportation, Washington, D.C.
Richardson, E. V., and Richardson, J. R. (1998). “Discussion of ‘Pier and abutment scour: Integrated approach’ by B. W. Melville.” J. Hydraul. Eng., 124(7), 771–772.
Richardson, J. R., and Richardson, E. V. (1993). “Discussion of ‘Local scour at bridge abutments’ by B. W. Melville.” J. Hydraul. Eng., 119(9), 1069–1071.
Sellin, R. H. J. (1964). “A laboratory investigation into the interaction between the flow in the channel of a river and that over its floodplain.” Houille Blanche, 7, 793–801.
Shearman, J. O. (1990). “User’s manual for WSPRO—A computer model for water surface profile computations.” Rep. No. FHWA-IP-89-027, U.S. Dept. of Transportation, Federal Highway Administration, Washington, D.C.
Stamey, T. C. (1996). “Summary of data-collection activities and effects of flooding from Tropical Storm Alberto in parts of Georgia, Alabama, and Florida, July 1994.” U.S. Geological Survey Open-File Report 96-228, U.S. Geological Survey, Atlanta.
Sturm, T. W. (1999). “Abutment scour in compound channels.” Stream stability and scour at highway bridges, E. V. Richardson and P. F. Lagasse, eds., ASCE, Reston, Va., 443–456.
Sturm, T. W. (2004). “Abutment scour studies for compound channels.” Report FHWA-RD-99-156, U.S. Dept. of Transportation, Federal Highway Administration, Washington, D.C.
Sturm, T. W., and Chrisochoides, A. (1998). “One-dimensional and two-dimensional estimates of abutment scour prediction variables.” Transportation Research Record, 1647, Transportation Research Board, National Research Council, Washington, D.C., 18–26.
Sturm, T. W., and Janjua, N. S. (1993). “Bridge abutment scour in a floodplain.” Proc., Hydraulic Engineering ’93, ASCE, New York, 761–766.
Sturm, T. W., and Janjua, N. S. (1994). “Clear-water scour around abutments in floodplains.” J. Hydraul. Eng., 120(8), 956–972.
Sturm, T. W., and Sadiq, A. (1996a). “Clear-water scour around bridge abutments under backwater conditions.” Transportation Research Record, 1523, Transportation Research Board, National Research Council, Washington, D.C., 196–202.
Sturm, T. W., and Sadiq, A. (1996b). “Water surface profiles in compound channel with multiple critical depths.” J. Hydraul. Eng., 122(12), 703–709.
U.S. Army Corps of Engineers. (2002). HEC-RAS, River analysis system user’s manual, U.S. Army Corps of Engineers, Hydrologic Engineering Center, Davis, Calif.
Wormleaton, P. R., and Merrett, D. J. (1990). “An improved method of calculation of steady uniform flow in prismatic main channel/flood plain sections.” J. Hydraul. Res., 28(2), 157–174.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 132 • Issue 1 • January 2006
Pages: 21 - 32
Copyright
© 2006 ASCE.
History
Received: Feb 11, 2004
Accepted: Feb 28, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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