Morphodynamical modelling of field-scale swash events
Morphodynamical modelling of field-scale swash events
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DOI：
10.1016/j.coastaleng.2015.09.006
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发表时间：
2016-09
影响因子：
4.4
通讯作者：
G. Incelli;N. Dodd;C. Blenkinsopp;Fangfang Zhu;R. Briganti
中科院分区：
文献类型：
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作者：
G. Incelli;N. Dodd;C. Blenkinsopp;Fangfang Zhu;R. Briganti
在本项工作中，从法国Le Truc Vert海滩在该地点进行测量现场活动期间发生的一次增潮的数据中挑选了三个单一冲浪事件的数据。之所以选择这些事件，主要是因为它们产生了不同的最终河床变化，即沿冲刷带的可变淤积、向海侵蚀/向陆地沉积和可变侵蚀。将这些数据与最先进的一维地形动力学浅水数值解算器得到的结果进行了比较，结果发现，流体动力学得到了合理的描述，尽管与观测结果相比，计算结果显示最大淹没减少了。该模型再现了每次事件后地形动力变化的正确量级，有时还再现了侵蚀和沉积的模式，但这种变化通常被低估了。敏感性分析是针对更不确定的物理参数和假设的初始条件进行的。它们表明，流速和悬沙浓度的初始空间分布在河床变化的定量和定性预报中起着关键作用。
In the present work, data for three single swash events are selected from those available for an accretive tide that occurred at Le Truc Vert beach (France) during a measurement field campaign at that location. These events are primarily chosen because of the different final bed change they produced, namely variable accretion, seaward erosion/landward deposition and variable erosion along the swash zone. These data are compared to results obtained from a ‘state-of-the-art’ numerical fully-coupled 1D morphodynamical shallow water solver, driven by measurements made of those events in the lower swash/inner surf zone.It is found that the hydrodynamics is reasonably well represented, although the computed results exhibit reduced maximum inundations in comparison with the observed ones. The model reproduces the correct order of magnitude of the morphodynamic change after each event, and sometimes the pattern of erosion and deposition, but this change is generally underestimated.Sensitivity analyses are conducted with respect to more uncertain physical parameters and assumed initial conditions. They suggest that initial spatial distributions for velocity and pre-suspended sediment concentration play a key role in the quantitative and qualitative prediction of the bed change.