摘要
泥沙淤积影响水库寿命和河口正常运行,而异重流排沙是减少库区淤积与河口淤积的重要措施之一。异重流形成的直观表象之一是泥沙浓度分布特征的转变,即泥沙浑水区与异重流区之间应存在划分两种泥沙浓度分布特征的分界线,研究分界线的分布形式有助于掌握异重流的演进规律。根据泥沙浓度公式及异重流下潜后的泥沙浓度分布特征,导出了泥沙浑水区与异重流区分界线的解析表达式,由连续性条件确定分界线起始点位置,并采用多组实验数据资料对理论模型进行了验证。
Sediment deposition affects the lifespan of reservoirs and estuaries.Density current is one of important measure to reduce sediment deposition in reservoirs and estuaries.The variation of sediment concentration means the formation of density current.A dividing line is used to distinguish the two different sediment concentration distribution characteristics,and the evolution law of the density current will be mastered by the dividing line.Based on the sediment concentration formula and the sediment concentration distribution characteristics,the expression of the dividing line between turbid current and density current is derived.The influence of sediment concentration on the viscosity coefficient is studied.The initial point of dividing line is determined by the continuity condition.The predictive accuracy is validated by flume experimental data.Sediment concentration,flow velocity and water depth are the key factors to influence the dividing line and the initial point by changing the experimental conditions.
作者
白玉川
温志超
徐海珏
张金良
BAI Yu-chuan;WEN Zhi-chao;XU Hai-jue;ZHANG Jin-liang(State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300350,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2021年第4期1-7,共7页
Journal of Sediment Research
基金
国家自然科学基金项目(41576093)。
关键词
含沙水流
异重流
泥沙浓度
分界线
起始点
turbid current
density current
sediment concentration
dividing line
initial point
作者简介
白玉川(1967-),男,山西神池人,教授,博士,主要从事河流泥沙运动方面研究。E-mail:ychbai@tju.edu.cn;通讯作者:温志超。E-mail:whenO12103@163.com。
