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Estuarine tidal response to sea level rise: The significance of entrance restriction

机译：海平面上升的河口潮汐反应：入口限制的意义

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Estuarine environments, as dynamic low-lying transition zones between rivers and the open sea, are vulnerable to sea level rise (SLR). To evaluate the potential impacts of SLR on estuarine responses, it is necessary to examine the altered tidal dynamics, including changes in tidal amplification, dampening, reflection (resonance), and deformation. Moving beyond commonly used static approaches, this study uses a large ensemble of idealised estuarine hydrodynamic models to analyse changes in tidal range, tidal prism, phase lag, tidal current velocity, and tidal asymmetry of restricted estuaries of varying size, entrance configuration and tidal forcing as well as three SLR scenarios. For the first time in estuarine SLR studies, data analysis and clustering approaches were employed to determine the key variables governing estuarine hydrodynamics under SLR. The results indicate that the hydrodynamics of restricted estuaries examined in this study are primarily governed by tidal forcing at the entrance and the estuarine length. In addition, SLR increases the average water depth and alters the nodal point location in a seaward direction, thereby significantly affecting tidal wave propagation patterns and reducing the degree of flood domination. In estuaries with restricted entrances, tidal range diminishes drastically in the restricted zone by 20-60%, and the maximum tidal current velocity is higher in the restricted part but lower in the upstream part compared to unrestricted estuaries. For estuary types examined, inundation extent under SLR will likely be greater than the extent expected through simply adjusting existing water levels upwards. The findings also underline that an engineered entrance restriction could regulate tidal wave propagation within an estuary to offset SLR induced tidal range amplification. However, this may pose additional management challenges.
机译：作为河流和公海之间的动态低调过渡区，河口环境易受海平面上升（SLR）。为了评估SLR对河口反应的潜在影响，有必要检查改变的潮汐动力学，包括潮气扩增，阻尼，反射（共振）和变形的变化。这项研究超越了常用的静态方法，本研究采用了一个大型的理想化河口流体动力学模型，分析了不同尺寸，入口配置和潮汐强制的潮汐范围，潮汐棱镜，阶段滞后，潮汐沟通速度和潮汐不对称的变化以及三个单反情景。首次在雌卤素SLR研究中，采用数据分析和聚类方法来确定单反相比单反来控制河口流体动力学的关键变量。结果表明，本研究中检测的受限制河口的流体动力学主要受到入口和河口长度的潮汐迫使。另外，SLR增加了平均水深并在海方向上改变了节点点位置，从而显着影响潮汐波传播模式并降低洪水统治程度。在受限制入口的河口中，潮汐范围在限制区中大幅度减小20-60％，并且限制部分的最大潮流速度较高，但与不受限制的河口相比，上游部分的限制部分较低。对于河口类型检查，SLR下的惩罚程度可能大于通过简单地调整现有水平的程度来提高。调查结果还强调，工程入口限制可以调节河口内的潮汐波传播，以偏移SLR诱导的潮汐范围放大。但是，这可能会造成额外的管理挑战。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2089-2089|共1页
  • 作者

    D. Khojasteh; S. Hottinger; S. Felder;

  • 作者单位

    Water Research Laboratory School of Civil and Environmental Engineering UNSW Sydney NSW Australia;

    Water Research Laboratory School of Civil and Environmental Engineering UNSW Sydney NSW Australia;

    Water Research Laboratory School of Civil and Environmental Engineering UNSW Sydney NSW Australia;

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