On the mechanisms of the saltating motion of bedload  

作　　者：Youhua Chen Yuchuan Bai Dong Xu 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China [2]Jinchang Water Conservancy Department, Gansu Province 737100, China

出　　处：《International Journal of Sediment Research》2017年第1期53-59,共7页国际泥沙研究（英文版）

基　　金：supported by the Longyuan Young Innovative Talents Personnel Support Project of Gansu Province;the Development Plan of Hundred Young Talents of Jinchang;National Natural Science Foundation for Innovative Research Groups of China(Grant No.51321065);the National Natural Science Foundation of China(Grant No.51279124 and 51009105);the Natural Science Foundation of Tianjin(Grant no.12JCQNJC05600)

摘　　要：Saltation of sediment particles is an important pattern of bedload transport. Based on force analysis for sediment particles, a Lagrangian model was proposed for the saltating motion of bedload in river flows, which was then solved with numerical method. Simulation results on the saltating trajectories neglecting particle rotation and turbulence effects compare fairly well with experimental observations. The mean values of the saltation parameters （saltation height, length and velocity） also agree well with the previous experimental data. Based on the numerical results, regression equations for the dimen- sionless saltation height, length and velocity were presented. Using the numerically achieved char- acteristics of the sediment saltation, we also obtained mathematical expression for the sediment transport rate. The studies in this paper are significant for its contribution to mechanism of the bedload motion and the computation of sediment transport rate.Saltation of sediment particles is an important pattern of bedload transport. Based on force analysis for sediment particles, a Lagrangian model was proposed for the saltating motion of bedload in river flows, which was then solved with numerical method. Simulation results on the saltating trajectories neglecting particle rotation and turbulence effects compare fairly well with experimental observations. The mean values of the saltation parameters （saltation height, length and velocity） also agree well with the previous experimental data. Based on the numerical results, regression equations for the dimen- sionless saltation height, length and velocity were presented. Using the numerically achieved char- acteristics of the sediment saltation, we also obtained mathematical expression for the sediment transport rate. The studies in this paper are significant for its contribution to mechanism of the bedload motion and the computation of sediment transport rate.

关 键 词：BedloadSaltationNumerical modelTransport rate 

分 类 号：TV149[水利工程—水力学及河流动力学]