Sediment Transport under Saltation Regime in Turbulent Flow Part B: Sensitivity Analysis of Important Parameters of the Model

Document Type : Research Article

Authors

1 Ph.D., Faculty of Civil and Environmental Eng., Tarbiat Modares University, Tehran, Iran

2 Professor, Water Engineering Research Center, Tarbiat Modares University, Tehran, Iran

3 Professor, Department of Mechanical and Aeronautical Engineering, Clarkson University, Potsdam, New York, USA

Abstract

In the present research, the developed 3D Eulerian-Lagrangian model of the sediment transport in Part A of this series is used to predict the effects of the bed-roughness height, water temperature (viscosity) and density of sediment grains. The selected parameters for the analyses are important both for sediment transport hydraulics and also uncertainties of experimental data. The results indicated that increasing bed-roughness height causes decrease in the saltation characteristics and consequently bed-load transport rate. The effects of water temperature (viscosity) are significant in the range of sand size, and it is necessary to keep it in the control for reducing uncertainties of experimental data. The sediment density has significant effects in both sand and gravel ranges, and thus the use of grains with different density compared to natural sediment can impose significant effects on experimental results.
 

Keywords


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  • Receive Date: 07 December 2015
  • Revise Date: 13 March 2017
  • Accept Date: 18 April 2017
  • First Publish Date: 18 April 2017