عنوان مقاله [English]
Based on the previous research, the flow rate estimation by the DCM method has been widely used in compound channels and many computational models have been developed accordingly. Therefore, a compound channel dividing into sections according to the most accurate method is a requirement that all researchers agree. While vertical lines are used in models for dividing the compound channel into the main channel and floodplain, some researchers maintain that vertical lines have an inaccurate performance compared with horizontal and diagonal lines, especially for low discharge (Khatua et al., 2013, Mohaghegh and Kouchakzadeh, 2008, and Ozbek et al., 2004). However, the methods for discharge estimation based on the shear stress calculation uses vertical lines (Ackers, 1993, Shiono and Knight, 1991, and Bousmar and Zech,1999). In this research, it has been attempted to present the best angle of the dividing line, which results in a 0% error rate calculated by comparing the effect of dividing lines with different angles on the calculation of the discharge of the compound channel.
Asgari, A., Mohammadi, M. and Manafpur, M., 2011. Flow Discharge and Energy Grade-line in Compound Channels. Water and Soil Science, 21(1), pp.85-96. (In Persian).
2- Ackers, P., 1992. Hydraulic design of two stage channels. Proceedings of the Institution of Civil Engineers, Water Maritime and Energy, 96(4), pp.247–257.
3- Ackers, P., 1993. Flow formula for straight two stage channels. Journal of Hydraulic Research, 31(4), pp.509-531
4- Bousmar, D. and Zech, Y., 1999. Momentum transfer for practical flow computation in compound channels. Journal of Hydraulic Engineering, ASCE, 125(7), pp. 696–706.
5- Khatua, K.K., Patra, K.C., Mohanty, P.K. and Sahu, M., 2013. Selection of interface for discharge prediction in a compound channel flow. International Journal of Sustainable Development and Planning, 8(2), pp. 214–230.
6- Khatua, K.K., Patra, K.C., Behera, S. and Mohanty, P.K., 2011. Apparent shear stress and boundary shear distribution in a compound channel flow. Computational Methods and Experimental Measurements XV, 51, pp. 215-228.
7- Knight, D.W. and Sellin, R.H.J., 1987. The SERC Flood Channel Facility. Journal of the Institution of Water and Environmental Management, 1(2), pp.198-204.
8- Maghrebi, M.F., Kavousizadeh, A., Faghfour Maghrebi, R. and Ahmadi, A., 2017. Stage-discharge estimation in straight compound channels using isovel contours. Hydrological processes, 31(22), pp.3859-3870.
9- Mohaghegh, A. and Kouchakzadeh, S., 2008. Evaluation of stage-discharge relationship in compound channels. Journal of Hydrodynamics, 20(1), pp. 81–87.
10- Ozbek, T., Kocyigit, M.B., Kocyigit, O. and Cebe, K., 2004. Comparison of methods for predicting discharge in straight compound channels using the apparent shear stress concept. Turkish Journal of Engineering and Environmental Sciences, 28(2), pp.101-109.
11-Parsaie, A., Yonesi, H.A. and Najafian, S., 2015. Predictive modeling of discharge in compound open channel by support vector machine technique. Modeling Earth System Environment,1(1)
12- Patra, K.C. and Khatua, K.K., 2006. Selection of interface plane in the assessment of discharge in two stage meandering and straight compound channels. Proceeding of the International Conference on Fluvial Hydraulics (IAHR), River Flow2006, Lisbon, pp.379–387.
13- Prinos, P. and Townsend, R.D., 1984. Comparison of methods of predicting discharge in compound open channels. Advances in Water Resources, 7(4), pp.180–187.
14- Shiono, K. and Knight, D.W., 1991. Turbulent open-channel flows with variable depth across the channel. Journal of Fluid Mechanics. 222,pp. 617–646.
15- Weber, J.F. and Menendez, A.N., 2004. Performance of lateral velocity distribution models for compound channel sections. Proceedings of the International Conference on Fluvial Hydraulics( IAHR), River Flow2004, Balkema, Rotterdam, the Netherlands, pp.449–457.
16- Wright, R.R. and Carstens, M.R., 1970. Linear momentum flux to overbank sections. Journal of the Hydraulics Division, ASCE, 96(9), pp.1781–1793.
17- Wormleaton, P.R., Allen, J. and Hadjipanos, P., 1982. Discharge assessment in compound channel flow. Journal of the Hydraulic Division, ASCE, 108(9): 975–994.