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Influence of the back-barrier basin length on the geometry of ebb-tidal deltas

机译：后屏障盆地长度对潮汐三角洲几何形状的影响

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摘要

The characteristics of ebb-tidal deltas are determined by the local hydrodynamics. The latter depend, among others, on the geometry of the adjacent back-barrier basin. Therefore, interventions in the back-barrier basin can affect the geometry of ebb-tidal deltas. In this study, the effect of the length of the back-barrier basin on the sand volume and spatial symmetry of ebb-tidal deltas is quantified with the use of a numerical model. It is found that the length of the back-barrier basin affects the tidal prism, the amplitude and phase of the primary tide and its overrides, and the residual currents that, together, determine the sand volume of the ebb-tidal delta. In particular, it is found that no unique relationship exists between tidal prism and sand volume of an ebb-tidal delta. The spatial symmetry of ebb-tidal deltas is also found to be affected by the length of the back-barrier basin. This is because th e basin length determines the phase difference between alongshore and cross-shore tidal currents. The numerical model results give a possible explanation for the changes that are observed in the geometry of the ebb-tidal deltas that are located seaward of the Texel Inlet and Vlie Inlet after the closure of the Zuiderzee.
机译：潮汐三角洲的特征由局部流体动力学确定。后者尤其取决于相邻的后屏障盆地的几何形状。因此，对后屏障盆地的干预会影响潮汐三角洲的几何形状。在这项研究中，使用数值模型来量化后屏障盆地的长度对沙量和潮汐三角洲空间对称性的影响。发现后屏障盆地的长度会影响潮汐棱镜，主要潮汐的振幅和相位及其超控，以及剩余电流，共同决定潮汐三角洲的沙量。特别地，发现潮汐棱镜与潮汐三角洲的砂体积之间不存在唯一的关系。潮汐三角洲的空间对称性也受到后屏障盆地长度的影响。这是因为盆地长度决定了沿岸和跨岸潮流之间的相位差。数值模型结果可能为解释在Zuiderzee封闭后位于Texel入口和Vlie入口靠海的潮汐三角洲的几何变化提供了可能的解释。

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