Hydrodynamic characteristics of lateral withdrawal in a tidal river channel with saltwater intrusion
Hydrodynamic characteristics of lateral withdrawal in a tidal river channel with saltwater intrusion
复制标题
咸水入侵潮汐河道侧退水动力特性
DOI：
10.1016/j.oceaneng.2021.108905
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发表时间：
2021-05
影响因子：
5
通讯作者：
Xiaodong Yu
中科院分区：
文献类型：
--
作者：
Wei He;Aili Jiang;Jian Zhang;Hui Xu;Yang Xiao;Sheng Chen;Xiaodong Yu
盐水入侵广泛存在于感潮河道中，显著改变了主流流速和密度（盐度）的垂向分布。它们对侧向撤退的水动力条件至关重要。本文建立了三维数值模型，并通过试验验证，研究了盐水入侵条件下侧向抽油的水动力特性。此外，还分析了主流速度、退出速度和密度分层的垂直分布效应。在非均匀主流流速条件下，表层流速大于底层流速时，上层的分裂宽度较小，而局地二次环流强于下层。二次环流呈“顶”形，并随着抽气速度的增加而减弱。当盐度层结存在时，下层的分割宽度减小，次级环流强于上层，同时垂直水交换增加。主流流速的影响大于盐度分层的影响。在这两种因素作用下，进入进水口的泥沙量增加，应采取淹没式导流板、槛、堰等措施。该研究是河口侧向回撤水动力研究的一个新进展，可为河口地区的工程设计提供依据。
Saltwater intrusions occur widely in tidal river channels, significantly changing the vertical distribution of mainstream velocity and density (salinity). They are vital to the hydrodynamic conditions of lateral withdrawal. In this study, a 3-D numerical model was constructed and validated through experimental tests, and the hydrodynamic characteristics of lateral withdrawal under saltwater intrusion were investigated. Additionally, the vertical distribution effects of mainstream velocity, withdrawal velocity, and density stratification were analyzed. Under non-uniform mainstream velocity conditions, with larger surface velocity than bottom velocity, the division width of the upper layer is smaller, while the local secondary circulation is stronger than that of the lower layer. Secondary circulation is top-shaped and weakens as the withdrawal velocity increases. When salinity stratification exists, the division width of the lower layer decreases, and the secondary circulation is stronger than that of the upper layer; meanwhile, the vertical water exchange increases. The influence of mainstream velocity is greater than that of salinity stratification. Under these two factors, the sediment entering the intake increases, and submerged vane, sill, and weir measures should be adopted. This research represents an advance in lateral withdrawal hydrodynamic research and provides support for engineering design in estuarine areas.
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