Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed
Modeling of suspended sediment concentrations under combined wave-current flow over rippled bed
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波纹床上波流联合流动下悬浮泥沙浓度的模拟
DOI：
10.1016/j.ecss.2017.09.020
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发表时间：
2017-09
影响因子：
2.8
通讯作者：
Qiao Fangli
中科院分区：
文献类型：
--
作者：
Lu Jing;Wang Xiao Hua;Babanin Alex;er V.;Aijaz Saima;Sun Younjong;Teng Yong;Jung Kyung-Tae;Qiao Fangli
海岸床上的涟漪动态地出现和消失。当波纹出现时，底部应力会显着增强，泥沙运移将受到波纹增强应力的影响。然而，涟漪对悬浮沉积物的影响却很少被讨论。在本研究中，基于波流组合的河床（波纹）模块与底部边界层（BBL）模型耦合。该 BBL 模型将我们改进的底部剪切应力 (BSS) 输出到沉积物模型 (UNSW-sed) 和水动力模型 (POM)。澳大利亚杰维斯湾的模型结果表明，考虑波纹而不是设置无波纹的均匀粗糙度（K b），可以显着改善模拟突然上升的悬浮泥沙浓度（SSC）。然而，使用以前的方案仍然低估了SSC。与之前估计的波纹增强剪切速度 U*c w e 不同，记为 U* c w e _ N L，我们引入了通过波纹增强 K b 计算改进的 U* c we e，记为 U* c w e _ K b。仿真表明，U*c w e _ K b 在高波条件下产生显着增加的 SSC，与测量结果相当一致。研究表明，波摩擦系数 f w 在引起 U* c we _ K b 和 U* c we _ N L 之间的差异方面发挥着至关重要的作用。
Ripples appear and disappear dynamically on coastal bed. The bottom stress can significantly be enhanced when ripples appear, and then the sediment transport will be influenced by the ripple-enhanced stress. However, ripples’ impact on suspended sediments is seldom discussed. In this study, a bedform (ripples) module based on combined wave and current flow is coupled with a bottom boundary layer (BBL) model. This BBL model outputs our improved bottom shear stress (BSS) to both the sediment model (UNSW-sed) and the hydrodynamic model (POM). Model results in Jervis Bay of Australia show that the simulated suspended sediment concentration (SSC) of an abrupt rising is significantly improved by considering ripples rather than setting a uniform roughness (K b) without ripples. However, the SSC is still underestimated by using previous schemes. Differently from the previous estimation of ripple-enhanced shear velocity U∗ c w e, noted as U∗ c w e _ N L, we introduce an U∗ c w e improved by calculating through ripple-enhanced ripple-enhanced K b, which is noted as U∗ c w e _ K b. Simulation shows that U∗ c w e _ K b produces significantly increased SSC under high wave conditions, resulting in reasonable agreements with the measurements. The wave friction factor f w is shown to play a crucial role in causing the difference between U∗ c w e _ K b and U∗ c w e _ N L.
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