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首页> 外文期刊>Ocean Dynamics >Sensitivity of tidal motion in well-mixed estuaries to cross-sectional shape, deepening, and sea level rise
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Sensitivity of tidal motion in well-mixed estuaries to cross-sectional shape, deepening, and sea level rise

机译：充分混合的河口的潮汐运动对横截面形状，加深和海平面上升的敏感性

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摘要

For well-mixed estuaries, key physical mechanisms are identified and quantified that cause changes in characteristics of the semi-diurnal sea surface elevation and lateral velocity due to modifications of the lateral bottom profile, channel deepening, and sea level rise. This is done by decomposing solutions of a new analytical model into components relating to different physical processes. The default geometry and parameter values are representative for the Ems estuary, with a converging width and a reflective landward boundary. The default Gaussian lateral bottom profile is modified to obtain profiles with the same cross-sectional area, but with a different skewness or steepness. Results show that a steeper lateral bottom profile leads to amplification of the sea surface elevation. The width convergence is shown to influence the resonance characteristics. Channel deepening and sea level rise result in amplification of the sea surface elevation until a resonance peak is reached. When flooding is incorporated, the amount of sea level rise at which maximum tidal amplification occurs is found to be about two times lower. When using a symmetric Gaussian bottom profile, the lateral tidal flow is determined by Coriolis deflection of longitudinal flow and lateral density gradients caused by differential salt advection. However, an additional lateral tidal flow component incorporating the effect of continuity related to sea level variations and longitudinal gradients in longitudinal flow is shown to become increasingly important for skewed lateral bottom profiles. Furthermore, the lateral flow due to the lateral density gradient is enhanced for bottom profiles with increased steepness.
机译：对于充分混合的河口，确定并量化了关键的物理机制，这些物理机制会由于侧向底部剖面的变化，河道加深和海平面上升而引起半日海平面高程和侧向速度特性的变化。这是通过将新分析模型的解决方案分解为与不同物理过程相关的组件来完成的。默认的几何形状和参数值代表Ems河口，具有会聚的宽度和反射的陆上边界。修改了默认的高斯横向底部轮廓，以获得具有相同横截面积但具有不同偏斜度或陡度的轮廓。结果表明，更陡的横向底部轮廓导致海平面高程的放大。示出宽度会聚会影响谐振特性。航道加深和海平面上升导致海面高度的放大，直到达到共振峰为止。当合并洪水时，发现发生最大潮汐放大的海平面上升量要低大约两倍。当使用对称的高斯底部剖面时，横向潮汐流由纵向流的科里奥利挠度和由盐分对流引起的横向密度梯度确定。但是，对于横向偏斜的底部轮廓，结合了与海平面变化和纵向流量中的纵向梯度有关的连续性影响的附加横向潮流成分显示出越来越重要的作用。此外，对于具有增加的陡度的底部轮廓，由于横向密度梯度而导致的横向流动被增强。

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