Assessment the Effective Parameters on Sediment Entrainment Coefficient of Body of Density Currents in Low Concentration

Document Type : Research Paper

Authors

1 Former MSc Student of Water Structures, Faculty of Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran

2 Professor, Faculty of Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran

3 Ph.D Student of Water Structures, Faculty of Water Sciences Engineering, Shahid Chamran University, Ahwaz, Iran

Abstract

A main source of sediment transport in dam
reservoir and lakes are density currents. A main parameters in density
currents, is sediment entrainment in the body. In this study the effective
parameters of sediment entrainment was studied. Experiments were conducted in
hydraulic modeling laboratory of hydraulic engineering department, Shahid
Chamran University of Ahwaz. The measuring section includes a flume with
adjustable slope, 9.25 m
long 0.5 m
width and 0.75 m
depth. Results show that, by increasing shear velocity and concentration of
inflow, sediment entrainment coefficient of body will increase. Normally,
sediment concentration in the body of the current will decrease due to
sedimentation but in the currents with sediment concentration less than
transport capacity, sedimentation are not occurred. Finally, two equations are
proposed for estimating sediment entrainment coefficient of the body of
turbidity currents.

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History

  • Receive Date: 12 January 2011
  • Revise Date: 08 March 2014
  • Accept Date: 11 July 2012
  • Publish Date: 22 August 2012

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