Observations of barrier coasts around the world suggest that some systems do not conform to the O'Brien‐Jarret law. Here we explain this by investigating how resonance and bottom friction affect the response of tidal inlets to variations in basin geometry. Therefore, we develop a morphodynamic barrier coast model that is based on the stability concept of Escoffier for the morphological evolution of the inlets, coupled with an idealized hydrodynamic model that describes the water motion in the outer sea, inlets, and arbitrarily shaped back‐barrier basin. We find that the total tidal prism through all inlets is predominantly determined by the (cross‐shore) width of the basin and identify three regimes for this. First, a linear regime for narrow basins (i.e., basin width tidal wavelength) where a larger basin leads to a linear increase in total tidal prism. Second, a resonant regime for basins with a width around the resonant condition in which the total tidal prism reaches a peak. This resonance condition is a quarter tidal wavelength for basins without friction, which shifts to narrower basins as friction becomes stronger, down to 0.15 tidal wavelength. Third, a dissipative regime for wide basins (i.e., the cross‐shore basin dimension or basin width resonant condition) with sufficiently strong bottom friction in which the total tidal prism does not change for wider basins, because the tidal wave completely dissipates in the basin.

中文翻译：

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后屏障盆地几何形状对多个潮汐入口系统的影响：共振和底摩擦的作用

观察世界各地的障碍性海岸，发现某些系统不符合奥布莱恩-杰雷特定律。在这里，我们通过研究共振和底部摩擦如何影响潮汐进口对盆地几何形状变化的响应来对此进行解释。因此，我们基于Escoffier的稳定性概念针对入水口的形态演化开发了形态动力屏障海岸模型，并结合了描述外海，入水口和任意形状的后屏障的理想水动力模型盆地。我们发现，通过所有入口的总潮汐棱镜主要由盆地的（跨岸）宽度决定，并为此确定了三种方案。首先，针对狭窄盆地的线性机制（即盆地宽度较大的盆地导致总的潮汐棱镜呈线性增加。其次，盆地的共振状态具有在整个潮汐棱镜达到峰值的共振条件附近的宽度。对于没有摩擦的盆地，这种共振条件是潮汐波长的四分之一，随着摩擦力的增大，潮汐波长会变窄，直至潮汐波长降至0.15。第三，对于具有足够强的底部摩擦的宽盆地（即跨岸盆地尺寸或盆地宽度共振条件）的耗散状态，其中总潮汐棱镜在较宽的盆地中不会改变，因为潮汐在盆地中完全消散了。