Transport capacity models for unsteady and non-equilibrium sediment transport in alluvial channels |
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| Affiliation: | 1. Dept. Civil Engineering, Izmir Institute of Technology, Urla, Izmir 35340, Turkey;2. Dept. Biological and Agricultural Engineering, Texas A and M University, College Station, TX 77843-2117, USA;3. Dept. of Civil and Environmental Engineering, Texas A and M University, College Station, TX 77843-2117, USA;1. Dept. of Agricultural and Biological Engineering, Purdue University, 225 South University Street, West Lafayette 47907-2093, Indiana, USA;2. UMI Ummisco, Centre IRD d''lle de France, 32, avenue Henri Varagnal, Bondy Cedex 93143, France;3. UMR-System, Institut Agronomique Méditerranéen de Montpellier (IAMM), 3191 route de Mende, Montpellier 34093, France;1. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Science, Xi''an Jiaotong University, Xi''an 710049, PR China;2. Somnio Global LLC, Novi 48377, United States;3. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, PR China;1. Department of Environmental Engineering, Faculty of Engineering, Dokuz Eylul University, Tinaztepe Campus, 35160 Buca, Izmir, Turkey;2. Turkish State Meteorological Service, Izmir Regional Directorate, Izmir, Turkey;1. Yıldız Tekchnical University, Dept. of Environmental Engineering, Davutpaşa Campus, Esenler, Istanbul, Turkey;2. Bartın University, Dept. of Environmental Engineering, Bartın, Turkey |
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| Abstract: | This study investigates transport capacity models based on different dominant variables-shear stress, stream power, unit stream power, flow discharge, flow velocity, and energy slope – in a model of unsteady and non-equilibrium sediment transport in alluvial channels. The model simulates fully coupled system of water flow, suspended sediment, and bed load sediment transport processes in two-layer system of water flow phase and movable bed. The model employs conservation of mass equation for the water in both the layers; suspended sediment in the water flow phase; sediment in the movable bed layer; and the momentum equation for the water flow in the flow phase. The system is closed by relating the sediment flux in the movable bed layer to the sediment concentration in the same layer by employing the kinematic wave theory. Using the sediment transport capacity expression with different dominant variables, a series of numerical experiments are carried out for unsteady and non-equilibrium sediment transport. The results seem theoretically reasonable for hypothetical cases. The model is calibrated and validated using different experimental data sets. The calibrated value for the transport capacity model’s exponent (ki) is found to be 1.50, 1.65, 0.24, 0.56, 4.80, and 0.22 for shear stress, stream power, unit stream power, discharge, velocity, and slope approaches, respectively. The numerical investigation results show that transport capacity model based on any dominant variable can be employed for modelling unsteady and non-equilibrium sediment transport. |
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