Three-dimensional saltating processes of multiple sediment particles  

作　　者：Hsiao-Wen WANG Hong-Yuan LEE Po-Ning LEE 

机构地区：[1]Dept. of Hydraulic and Ocean Engineering, National Cheng Kung University [2]Dept. of Civil Engineering, National Taiwan University

出　　处：《International Journal of Sediment Research》2009年第1期16-32,共17页国际泥沙研究（英文版）

基　　金：supported by the National Science Council of Taiwan, the Republic of China. The writers would like to thank the staff of the Hydraulic Research Laboratory of National Taiwan University for their support in conducting the experiments.

摘　　要：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 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.

关 键 词：Interparticle collision SALTATION SEDIMENT Three dimension Charged couple device （CCD） 

分 类 号：TV142[水利工程—水力学及河流动力学]