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首页> 外文期刊>Geosciences >A Numerical Investigation on Tidally Induced Sediment Transport and Morphological Changes with Changing Sea Level in South-East England
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A Numerical Investigation on Tidally Induced Sediment Transport and Morphological Changes with Changing Sea Level in South-East England

机译：英格兰东南部潮汐潮汐引起的泥沙迁移和形态变化的数值研究

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The impact of tide-induced morphological changes and water level variations on the sediment transport in a tidally dominated system has been investigated using the numerical model Delft3D and South-East England as a test case. The goal of this manuscript is to explore the long-term changes in morphology due to sea level rise and the large-scale morphodynamic equilibrium of the South-East England. Our results suggest that the long term (century scale) tidally-induced morphological evolution of the seabed slows down in time and promotes a vanishing net transport across the large scale system. Century-scale morphologically updated simulations show that both morphological changes and net transport values tend to decrease in time as the system attains a dynamic equilibrium configuration. Results further suggest that the presence of a gradual increase in mean sea level accelerates the initial morphological evolution of the system whose morphological rate of change gradually attains, however, same plateau values as in the absence of sea level rise. Given the same base morphology, increasing water levels enhance residual currents and the net transport near the coastline; and vice-versa, decreasing sea levels minimize both residuals and net transport near the coastline. The areas that are more affected by, water level and morphological changes, are the ones where the net transport is the highest. This manuscript explores and allows extending the idea of morphodynamic equilibrium at a regional scale, larger than the one for which this concept has been generally explored i.e., estuarine scale.
机译：使用数值模型Delft3D和东南英格兰作为测试案例，研究了潮汐引起的形态变化和水位变化对潮汐主导系统中的泥沙迁移的影响。该手稿的目的是探讨由于海平面上升和英格兰东南部的大规模形态动力学平衡而引起的长期形态变化。我们的研究结果表明，长期（百年尺度）潮汐诱发的海床形态演化在时间上放慢了速度，并促进了整个大规模系统中净运输的消失。百年尺度的形态更新仿真显示，随着系统达到动态平衡构型，形态变化和净运输价值均趋于随时间减小。结果进一步表明，平均海平面逐渐增加的存在加速了该系统的初始形态演化，该系统的形态变化率逐渐达到，但是，与没有海平面上升的情况相同的高原值。在基本形态相同的情况下，不断增加的水位会增加残留电流和海岸线附近的净运输量。反之亦然，海平面的下降将海岸线附近的残留物和净运输量减至最少。受水位和形态变化影响最大的区域是净运输量最高的区域。该手稿探索并允许在区域尺度上扩展形态动力学平衡的概念，该范围要比对此概念已被普遍探索的范围即河口尺度更大。

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