Three-dimensional saltating processes of multiple sediment particles

• 作 者: Hsiao-Wen WANG Hong-Yuan LEE Po-Ning LEE
• 机 构: Dept. of Hydraulic and Ocean Engineering, National Cheng Kung University,Dept. of Civil Engineering,
• 出 处: International Journal of Sediment Research
• 发表日期: 2009年01期
• 关键词: Interparticle collision Saltation Sediment Three dimension Charged couple device

The purpose of this study was to investigate the interacting mechanism between the saltating particles near a channel bed. A three-dimensional real-time flow visualization technique was developed to measure the interparticle collision behaviors during the saltating process. Based on the experimental data,the distribution of the collision points was found to be symmetric. This confirms the assumption that the projections of the collision points onto the reasonable plane are uniformly distributed. A three-dimensional saltating model was also developed. This model produced satisfactory results. The model is able to simulate the continuous saltating trajectories of several particles. The simulated dimensionless saltating height,longitudinal and vertical saltation velocity components were found to increase as the dimensionless particle diameter and the dimensionless flow transport capacity parameter increase,while the simulated lateral saltation velocity component varies inversely with the dimensionless flow transport capacity parameter. A regression equation for the bed load transport rate was also obtained.

The purpose of this study was to investigate the interacting mechanism between the saltating particles near a channel bed. A three-dimensional real-time flow visualization technique was developed to measure the interparticle collision behaviors during the saltating process. Based on the experimental data, the This confirms the assumption that the projections of the collision points onto the reasonable plane are also developed. This confirms the assumption that the projections of the collision points onto the reasonable plane are also developed. This model produces satisfactory results. The simulated dimensionless saltating height, longitudinal and vertical saltation velocity components were found to increase as the dimensionless particle diameter and the dimensionless flow transport capacity parameter increase, while the simulated lateral salt velocity velocity varies due inly with the dimensionless flow transport capacity parameter. A regression equation for the bed load transport rate was also obtained.