异重流潜入现象探讨Ⅱ:浑水水槽实验与分析  

Investigation of density current plunging Ⅱ: Experiments and theoretical analysis

作　　者：范家骅[1] 祁伟[1] 戴清[1] FAN Jiahua;QI Wei;DAI Qing(China Institute of Water Resources ＆ Hydropower Research, Beijing 100048, China)

机构地区：[1]中国水利水电科学研究院,北京100048

出　　处：《水利学报》2018年第5期535-548,共14页Journal of Hydraulic Engineering

摘　　要：在上篇回顾异重流潜入现象研究中前人水槽实验情况和理论分析成果的基础上,本篇首先对浑水水槽实验测得的潜入点上下游沿程断面上的流速分布、含沙量分布及浑水潜入形成异重流的交界面曲线等数据进行分析,求得不同进槽流量、含沙量的进口水沙条件下潜入点处的密度Froude数Fp判别值;其次考虑潜入点Fp与其下游异重流水深hd等因素的关系,进行水库和引航道异重流潜入的理论分析,应用能量方程、动量方程分析得到忽略掺混的4种Fp与hd/hp的表达式,并与实验数据作比较,两者较接近;再将以往各学者的理论研究Fp的表达式略作推演,获得同本文推导公式近似或相同的公式,以便同本文实验资料进行比较。This is the second part of the paper which presents the flume test and theoretical analysis re-sults：（1） In the upstream and downstream reaches of the plunge point, the velocity and sediment concen-tration profiles in the longitudinal direction, and the density current interface curves downstream of theplunge point were measured in the flume tests. Also a data analysis of the criterion Fpat the plunge pointwas made.（2） Theoretical analysis of the plunging flow in a reservoir backwater region, and in a naviga-tion guiding channel were investigated, by applying the energy and momentum equations. There are fourequations of Fpat the plunge point as related with hd/hp,which are derived and verified by flume test da-ta.（3） The four equations of Fp=f（hd/hp） were also compared with the theoretical analysis results of Fp,de-rived by different researchers.

关 键 词：异重流 异重流潜入 水槽实验 理论分析 

分 类 号：TV145.2[水利工程—水力学及河流动力学]