后台阶下游紊流对推移质输沙率影响的实验研究  

Experimental study of turbulence effect on bed load transport rate downstream of the back-facing step

作　　者：刘东阳[1] 程年生 卢叶盛 魏茂兴 LIU Dong-yang;CHENG Nian-sheng;LU Ye-sheng;WEI Mao-xing(Ocean College,Zhejiang University,Zhoushan 316021,China)

机构地区：[1]浙江大学海洋学院,浙江舟山316021

出　　处：《泥沙研究》2022年第5期8-14,22,共8页Journal of Sediment Research

基　　金：国家自然科学基金项目(51979242)。

摘　　要：有关紊流对推移质输沙率的影响近年来已开展了不少研究,但对其影响机理仍缺乏清楚的认识。通过水槽实验研究,系统测量了后台阶下游紊流特性和推移质输沙率的沿程变化规律,并详细分析了推移质输沙率与平均流速和近床紊动参数之间的相互关系。结果表明:与其他水流参数相比,近床紊动强度可以更好地描述后台阶下游紊流对推移质输沙率的影响;所获得的经验关系与一般的平床输沙情况相一致,并得到相关文献资料的验证。Many efforts have been made in recent decades to explore turbulence effects on bed load transport;however,relevant mechanisms are not well understood.In this paper,the relationships between different flow parameters and bed load transport rate under the conditions of back-facing step were experimentally investigated.The longitudinal variations in the bed load transport rate with the flow parameters are presented.The results show that,among the considered flow parameters,the turbulent intensity achieves the best correlation with the bed load transport rate,and therefore can be considered as the basic flow parameter to describe the influence of the back-facing step turbulence on the bed load transport.The obtained empirical relation is also applicable to the case of plane bed and verified by the published data.

关 键 词：推移质 输沙率 后台阶 紊流 PIV 

分 类 号：TV142.2[水利工程—水力学及河流动力学]