APPLICABILITY OF PICK-UP RATE EQUATION TO HIGH BED SHEAR STRESS CONDITION : EXAMINATION USING 3D SEDIMENT TRANSPORT SIMULATION FOR SEDIMENT RELEASE AT SETTLING BASIN

Abstract

 Efficient sand removal from settling basins or tanks is increasingly being studied using 3D sediment transport simulations. However, the applicability of the pick-up rate equation is still unclear under the high bed shear stress conditions. In this study, we first reviewed previous experimental data on pick-up rates and examined the suitability of the pick-up rate equation. Next, the applicability of the pick-up rate equation was verified through 3D simulations of sediment release tests at the actual settling basin. The literature review and simulation result showed that the pick-up rate equation proposed by van Rijn simulated has good accuracy for sand under the high bed shear stress conditions. In addition, the result implied that the grain size dependence has non-negligible effect on the non-dimensional pick-up rate.