Authors

1 Civil Engineering Department, University of Technology, Baghdad, Iraq. 40071@uotechnology.edu.iq

2 Civil Engineering, Department, University of Technology, Baghdad, Iraq. luayk.alwaeli@uokufa.edu.iq

Abstract

River engineering investigations require some level of hydrodynamic and morphologic analysis. The detailed of the hydraulic and morphologic features through meander evolution can be recorded by the numerical model spatially and temporally. The Center for Computational Hydro-science and Engineering, two- dimensional model (CCHE2D V3.29) was adopted to investigate the hydraulic and morphologic changes through meander’s evolution. Through the experimental work, a series of experiments runs were carried out through combining different geometric and hydraulic parameters to produce different experiment conditions. These parameters are flow rate, bed slope, and different initial incised and wide channels for both rectangular and trapezoidal sections. The CCHE2D model was calibrated and verified using two sets of experimental data. According to the computed values of statistical indicators, BIAS, NSE, and MAE of 0.0084, 0.96, and 0.0132 respectively for water level simulation, and 0.007,0.94, and 0.0182 respectively for bed level simulation, the calibrated Manning’s roughness which gives an acceptable agreement between simulated and measured water and bed levels was 0.029. The verification results were evaluated by the same statistical indicators of BIAS, NSE, and MAE of 0.09, 0.81, and 0.018, respectively, as evidenced by the statistical indicators, values that the CCHE2D model was reasonably capable of simulating the hydraulic and morphological changes through meander evolution.

Keywords

 
[1]       H. Cameron, and B. Bauer, “River bank erosion processes along the Lower Shuswap River,” Final report project. university of British Colombia Okanagan, 2014
[2]       K. Blanckaert, “Hydrodynamic processes in sharp meander bends and their morphological implications,” Journal of geophysical research, Vol. 116, F01003, 2011.
[3]       J. Kalkwijk, and H. Devriend, “Computation of the flow in shallow river bends,” Journal of Hydraulic Resources, 18, 4, 327-341, 1980.
[4]       J. F. Friedkin, “A laboratory study of the meandering of alluvial rivers,” US Army Engineer Waterways Experiment Station, Vicksburg, Mississippi, 1945.
[5]       L. Yilmaz, “Modeling of developed meanders of an alluvial channel, sediment transport, Dr. Silvia Susana Ginsberg (Ed.), ISBN: 978-953-307-189-3, available www.intechopen.com, 2011.
[6]       A. Odgaard, “River meander model. I: development,” J. Hydraul. Eng., 115, 11, 1433–1450, 1989.
[7]       T. Molls, and M. H. Chaudhry, “Depth-averaged open-channel flow model,” J. Hydraulic. Eng., 121, 6, 453–465, 1995
[8]       T. Y. Hsieh, and J. C. Yang, “Investigation on the suitability of two-dimensional depth-averaged models for bend-flow simulation,” J. Hydraul. Eng., 129, 8, 597–612, 2003.
[9]   P. Arpan, K. K. Kishanjit, and S. Sovan, “Variation of velocity distribution in rough meandering channels,” Department of Civil Engineering, Hydraulics Laboratory, National Institute of Technology Rourkela, Odisha, India, 2015.
[10]    A. Aziaian, M. Gholizadeh, and T. E. Amiri “Simulation of meandering rivers migration processes using CCHE2D,” Proceedings of the 8th International River Engineering Conference, Iran, 2010.
[11]   H. Taebi, B. M. Shafaee and M. Kaheh, “Simulation of flow in 90o bends using CCHE2D software,” In the Proceedings of the 8th International River Engineering Conference, Iran, 2010.
[12]   C. He Li, Dong, J. Yafei, and Y. Zhang, “Modeling bed load transportation along the same-side and opposite banks of Meanders,” the 36th IAHR World Congress, Hague, Netherlands, 2015.
[13]   S. A. Schumm, M. Mosley, and W. Weaver, “Experimental fluvial geomorphology,” Wiley. New York, 1978.
[14]   L. C. Van Rijn, “Principles of sediment transport in rivers, estuaries and coastal seas,” (ed.) Aqua Publications, Netherlands (http://www.tooraj– sabzevari.blogfa.com), 1993.
[15]   C. Auel, I. Albayrak, and R. M. Boes, “Turbulence Characteristics in supercritical open-channel flows: effects of froude number and aspect ratio,” Journal of Hydraulic Engineering, 2013.
[16]   H. Bonakdari, L. Gislain, A. Girdhari “Developing turbulent flows in rectangular channels: a parametric study,” Journal of Applied Research in Water and Wastewater 2, P 51-56., available http://arww.razi.ac.ir/article_52.html, 2014.
[17]   Y. Zhang, “CCHE-GUI graphical users interface for NCCHE model”, User’s Manual Technical Report No. NCCHE-TR-2008-01. The University of Mississippi, 2008.
[18] V. T. Chow, “Open channel hydraulics”, McGraw-Hill Book Company, NY, 1959.