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

Abstract

A main source of sediment transport in damreservoir and lakes are density currents. A main parameters in densitycurrents, is sediment entrainment in the body. In this study the effectiveparameters of sediment entrainment was studied. Experiments were conducted inhydraulic modeling laboratory of hydraulic engineering department, ShahidChamran University of Ahwaz. The measuring section includes a flume withadjustable slope, 9.25 mlong 0.5 mwidth and 0.75 mdepth. Results show that, by increasing shear velocity and concentration ofinflow, sediment entrainment coefficient of body will increase. Normally,sediment concentration in the body of the current will decrease due tosedimentation but in the currents with sediment concentration less thantransport capacity, sedimentation are not occurred. Finally, two equations areproposed for estimating sediment entrainment coefficient of the body ofturbidity currents.

Keywords

• density currents
• sediment entrainment
• sediment transport
• gravity currents