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

• Main Authors: H. Beshavard, M. Ghomeshi, M. Mansouri Hafshejani
• Format: Article
• Language: fas
• Published: Shahid Chamran University of Ahvaz 2012-08-01
• Series: علوم و مهندسی آبیاری
• Subjects: density currents; sediment entrainment; sediment transport; gravity currents
• Online Access: http://jise.scu.ac.ir/article_10508_473fb08c974fe7fce016e70f7b7bb530.pdf

<span style="font-family: 'Times New Roman','serif'; font-size: 11pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: AR-SA; mso-ansi-language: EN-US; mso-fareast-language: EN-US;">A main source of sediment transport in dam<br />reservoir and lakes are density currents. A main parameters in density<br />currents, is sediment entrainment in the body. In this study the effective<br />parameters of sediment entrainment was studied. Experiments were conducted in<br />hydraulic modeling laboratory of hydraulic engineering department, Shahid<br />Chamran University of Ahwaz. The measuring section includes a flume with<br />adjustable slope, 9.25 m<br />long 0.5 m<br />width and 0.75 m<br />depth. Results show that, by increasing shear velocity and concentration of<br />inflow, sediment entrainment coefficient of body will increase. Normally,<br />sediment concentration in the body of the current will decrease due to<br />sedimentation but in the currents with sediment concentration less than<br />transport capacity, sedimentation are not occurred. Finally, two equations are<br />proposed for estimating sediment entrainment coefficient of the body of<br />turbidity currents</span><span style="font-family: 'Times New Roman','serif'; font-size: 12pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-language: AR-SA; mso-ansi-language: EN-US; mso-fareast-language: EN-US;">.</span>