Laboratory measurements of vortex-induced sediment pickup rates  

作　　者：Niansheng Cheng Adel Emadzadeh 

机构地区：[1]School of Civil and Environmental Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore

出　　处：《International Journal of Sediment Research》2017年第1期98-104,共7页国际泥沙研究（英文版）

摘　　要：In the present study, vortices were generated in open channel flow with a cross-flow cylinder installed horizontally near the bed. Sediment pickup rates were then measured over the channel bed downstream the cylinder using a sediment lift. The experimental data show that the pickup rate increases expo- nentially in the presence of vortices. Two different relationships can be clearly observed between the pickup rate and the maximum root-mean-square （rms） value of the streamwise velocity fluctuation, one for the cylinder-obstructed flow and the other for the unobstructed flow. The results imply that the vortex-induced sediment pickup cannot be explained based on the traditional boundary layer theory.In the present study, vortices were generated in open channel flow with a cross-flow cylinder installed horizontally near the bed. Sediment pickup rates were then measured over the channel bed downstream the cylinder using a sediment lift. The experimental data show that the pickup rate increases expo- nentially in the presence of vortices. Two different relationships can be clearly observed between the pickup rate and the maximum root-mean-square （rms） value of the streamwise velocity fluctuation, one for the cylinder-obstructed flow and the other for the unobstructed flow. The results imply that the vortex-induced sediment pickup cannot be explained based on the traditional boundary layer theory.

关 键 词：Sediment pickup rateVortexTurbulenceCylinder 

分 类 号：TV149[水利工程—水力学及河流动力学]