Estimating the Overbank Flow Discharge using Slope-Area Method
Publication: Journal of Hydrologic Engineering
Volume 16, Issue 11
Abstract
The present research proposed an improved slope-area method for estimating the overbank flow discharge. The prediction of conveyance factor has been improved by including the secondary flows effect using the coherence concept. Field measurements of velocity that reached 540 m were taken in a study of the River Dough, south of Kalale City, Iran, during the February 2004 flood. A nonlinear trend was observed between the depth of the relative flood-marks and the amount of predicted discharge error. The slope-area method significantly overestimated the overbank flow rate, especially in nonhomogeneous cross section, where the interaction effects increase progressively with a relative depth of less than 0.2. The overestimated value of 23% was obtained in prediction of the River Dough overbank flow by the slope-area method. The improved slope-area method predicted the flow rate with an error of 2.58% compared to the flood field measurements. The results show agreement between the proposed method prediction and the measured data.
Get full access to this article
View all available purchase options and get full access to this article.
References
Ackers, P. (1992). “Hydraulic design of two-stage channels.” Proc. ICE Water Marit. Energy, 96(4), 247–257.
Ackers, P. (1993). “Stage-discharge functions for two-stage channels.” Water Environ. J., 7, 52–61.
Blalock, M. E., and Sturm, T. W. (1981). “Minimum specific energy in compound channel.” J. Hydraul. Div., 107(6), 699–717.
Bousmar, D., and Zech, Y. (1999). “Momentum transfer for practical flow computation in compound channels.” J. Hydraul. Eng., 125, 696–706.
Chow, V. T. (1959). Open channel hydraulics, McGraw-Hill, New York.
Dalrymple, T., and Benson, M. (1967). “Measurement of peak discharge by the slope-area method.” Chapter A2, Techniques of water-resources investigations of the United States Geological survey, U.S. Government Printing Office, Washington, DC.
Keller, R. J., and Rodi, W. (1988). “Prediction of flow characteristics in main channel/flood plain flows.” J. Hydraul. Res., 26(4), 425–441.
Knight, D. W., and Demetriou, J. D. (1983). “Floodplain and main channel flow interaction.” J. Hydraul. Eng., 109, 1073–1092.
Knight, D. W., and Hamed, M. E. (1984). “Boundary shear in symmetrical compound channels.” J. Hydraul. Eng., 110(10), 1412–1430.
Knight, D. W., and Sellin, R. H. J. (1987). “The SERC flood channel facility.” Water Environ. J., 1(2), 198–204.
Knight, D. W., and Shiono, K. (1990). “Turbulence measurements in a shear layer region of a compound channel.” J. Hydraul. Res., 28, 175–196.
Kordi, E. (2006). “Prediction of critical depth in compound channels.” M.Sc. thesis, Univ. of Mazandaran (UMZ), Iran (in Persian).
Kordi, E., Ayyoubzadeh, S. A., Ahmadi, M. Z., and Zahiri, A. (2009). “Prediction of lateral flow regime and critical depth in compound open channels.” Can. J. Civ. Eng., 36, 1–13.
Lambert, M. F., and Sellin, R. H. J. (1996). “Discharge prediction in straight compound channels using the mixing length concept.” J. Hydraul. Res., 34, 381–394.
Lotter, G. K. (1933). “Considerations on hydraulic design of channels with different roughness of walls.” Transactions of All-Union Scientific Research, Vol. 9, Institute of Hydraulic Engineering, Leningrad, Russia, 238–241.
Myers, W. R. C. (1978). “Momentum transfer in a compound channel.” J. Hydraul. Res., 16, 139–150.
Myers, W. R. C., and Elsawy, E. M. (1975). “Boundary shear in channel with floodplain.” J. Hydraul. Div., 101(7), 933–946.
Nezu, I., and Nakagawa, H. (1993). Turbulence in open-channel flows, A.A. Balkema, Rotterdam, Netherlands.
Perkins, H. J. (1970). “The formation of streamwise vorticity in turbulent flow.” J. Fluid Mech., 44(4), 721–740.
Prinos, P., and Townsend, R. D. (1984). “Comparison of methods for predicting discharge in compound channels.” Adv. Water Resour., 7(4), 180–187.
Samuels, P. G. (1984). “Computational modeling of open channel flow. An analysis of some practical difficulties.” Rep. IT. 273, Hydraulic Research, Wallingford, UK.
Seckin, G. (2004). “A comparison of one-dimensional methods for estimating discharge capacity of straight compound channels.” Can. J. Civ. Eng., 31, 619–631.
Sellin, R. H. J. (1964). “A laboratory investigation into the interaction between the flow in the channel of a river that is over its floodplain.” La Houille Blanche, 7, 793–802.
Shiono, K., and Knight, D. W. (1991). “Turbulent open-channel flows with variable depth across the channel.” J. Fluid Mech., 222, 617–646.
Wark, J. B., James, C. S., and Ackers, P. (1994). “Design of straight and meandering compound channels.” Research and Development Rep. No. 13, UK National Rivers Authority, Bristol, UK, 1–86.
Wark, J. B., Samuels, P. G., and Ervine, D. A. (1990). “A practical method of estimating velocity and discharge in a compound channels.” River flood hydraulics, W. R. White, ed., Wiley, Chichester, UK, 163–172.
Wormleaton, P. R., Allen, J., and Hadjipanos, P. (1982). “Discharge assessment in compound channel flow.” J. Hydraul. Div., 108(9), 975–994.
Wormleaton, P. R., and Merrett, D. J. (1990). “An improved method of the calculation for study uniform flow in prismatic main channel/flood plain sections.” J. Hydraul. Res., 28, 157–174.
Wright, P. R., and Carstens, H. R. (1970). “Linear momentum flux to overbank sections.” J. Hydraul. Div., 96(9), 1781–1793.
Information & Authors
Information
Published In
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 12, 2010
Accepted: Feb 1, 2011
Published online: Jun 10, 2011
Published in print: Nov 1, 2011
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.