Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/5623
Title: Transport capacity models for unsteady and non-equilibrium sediment transport in alluvial channels
Authors: Tayfur, Gökmen
Singh, Vijay P.
Keywords: Dominant variable
Non-equilibrium
Numerical model
Sediment transport
Transport capacity
Unsteady
Publisher: Elsevier Ltd.
Source: Tayfur, G. and Singh, V. P. (2012). Transport capacity models for unsteady and non-equilibrium sediment transport in alluvial channels. Computers and Electronics in Agriculture, 86, 26-33. doi:10.1016/j.compag.2011.12.005
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.
URI: http://dx.doi.org/10.1016/j.compag.2011.12.005
http://hdl.handle.net/11147/5623
ISSN: 0168-1699
Appears in Collections:Civil Engineering / İnşaat Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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