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An experimental study on sediment transport and bed evolution under different swash zone morphological conditions

机译：不同冲积带形态条件下沉积物运移和床层演化的实验研究

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摘要

In this study, new large-scale experimental data are presented showing evidences of a link between the swash zone dynamics and the surf zone morphodynamics. Two sets of large-scale experiments are presented. The first set of experiments investigates the swash and surf dynamics under the same hydrodynamic forcing but with two different swash zone morphological conditions, one of which was created by manual reshaping of the sub-aerial beach face. It is shown that more dissipative swash zone conditions (a more mildly sloping beach face) significantly reduce the rate of seaward sandbar migration such that it almost ceases during the performed experimentation time. This behavior is compared to a second set of experiments which shows the natural sand bar offshore migration under almost identical hydrodynamic forcing. The changes in the sandbar migration are investigated in terms of the differences in the swash zone dynamics. The more reflective swash zone is characterized by more intense backwashes that, in turn, promote significant quantities of sediment suspension during the interaction of the backwash with the subsequent bore. The dissipative swash zone leads to a larger number of wave-swash interactions, reducing the backwash magnitudes and the magnitude of suspended sediment concentration events in the swash zone, with a corresponding reduction in the offshore suspended sediment transport. The total offshore sediment transport rates are also shown to reduce, leading to the observed modification of the sandbar migration.
机译：在这项研究中，提出了新的大规模实验数据，显示了斜流带动力学与冲浪带形态动力学之间的联系。提出了两组大型实验。第一组实验研究在相同的水动力作用下，但在两个不同的斜带形态条件下的斜盘和冲浪动力学，其中一个是通过手动重塑空中沙滩面来创建的。结果表明，更耗散的旋转带条件（较缓坡的海滩面）显着降低了沙洲向海的迁移速度，从而在进行的实验时间内几乎停止了迁移。将该行为与第二组实验进行了比较，第二组实验显示了在几乎相同的水动力作用下天然沙洲的海上迁移。根据斜流带动力学的差异研究了沙洲迁移的变化。反射性更强的斜流带的特点是反冲洗强度更高，反过来又会在反冲洗与后续孔眼相互作用时促进大量的泥沙悬浮。耗散性冲刷带导致大量的波浪冲刷-冲刷相互作用，从而降低了冲刷带中的反冲幅度和悬浮泥沙浓度事件的幅度，并相应减少了海上悬浮泥沙的输送。还显示出总的近海沉积物运移速率降低，导致观察到的沙洲迁移变化。

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