Model Study of the Influence of Submerged Tidal Barriers on Estuarine Mixing and Exchange Processes
Model Study of the Influence of Submerged Tidal Barriers on Estuarine Mixing and Exchange Processes
复制标题
水下潮汐屏障对河口混合交换过程影响的模型研究
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
Yakun Guo
中科院分区：
文献类型：
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作者：
A. Cuthbertson;P. Davies;Yakun Guo
已经进行了模型研究，以研究由淡水流入供应的蓄水池内的咸淡水池的空间和时间发展，该蓄水池的边界是一个不可渗透的屏障，周期性地被潮汐产生的咸水流入所淹没。结果表明，淡水流入和下游潮汐条件对该池的时间发育具有相对的控制作用。特别是，实验数据表明，在特定次数的潮汐循环后，咸淡水池的尺寸达到平衡，池的归一化厚度主要取决于淡水流入的强度。蓄水池内水的密度结构可以用两个贡献过程来解释，即：(1)淡水被湍流夹带进入含盐侵入区；(2)在退潮条件下，上覆淡水对咸淡水的剪切界面侵蚀。标度分析表明，微咸水池厚度的时间增长可以成功地用一个体积比来参数化，该体积比代表了在盐水入侵阶段蓄水池中储存的淡水的稀释能力。
Model studies have been undertaken to study the spatial and temporal development of a brackish pool within an impoundment supplied by a freshwater inflow and bounded by an impermeable barrier that is overtopped periodically by a tidally generated saline water inflow. The results demonstrate the relative influence of the freshwater inflow and downstream tidal conditions in controlling the temporal development of this pool. In particular, the experimental data illustrate that the dimensions of the brackish pool reach equilibrium after a specific number of tidal cycles, with the normalized thickness of the pool being dependent primarily on the strength of the freshwater inflow. The density structure of the water within the impoundment is interpreted in terms of two contributory processes, namely, (1) turbulent entrainment of fresh receiving water into the saline intrusion; and (2) shear-induced interfacial erosion of the brackish water by the overriding fresh water during receding tidal conditions. A scaling analysis shows that the temporal growth of the brackish pool thickness can be parameterized successfully in terms of a volume ratio representing the dilution capacity of the freshwater stored in the impoundment during the saline intrusion phase.