Variation of suspended-sediment caused by tidal asymmetry and wave effects

IF 3.1 3区地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES Ocean Modelling Pub Date : 2024-10-10 DOI:10.1016/j.ocemod.2024.102454

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Abstract

Suspended sediment plays an important role in coastal topography evolution and ecological environment change. To obtain a clear picture of the underlying mechanisms, we studied the response of suspended sediment dynamics to tidal current and wave-current interactions using the wave-current-sediment model of SCHISM. The results revealed evident tidal asymmetry in the study area, and showed that the suspended sediment concentration (SSC) markedly changes within a tidal cycle. We also disassembled the wave–current interactions to determine the contribution of each physical mechanism of the wave and hydrodynamic models. Regarding the importance of various effects of wave-current interactions on SSC, the wave-induced bottom shear stress and wave-induced radiation stress should be considered. The importance of advection in horizontal space is comparable to that of wave-induced bottom shear stress and wave-induced radiation stress, and is greater than that of the other types of wave energy advection. This study successfully explained all the mechanisms that influence the variation of SSC to the southwest of Hainan Island, which is helpful for coastal management and could provide a reference for other coastal areas.

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潮汐不对称和波浪效应引起的悬浮沉积物变化

悬浮泥沙在海岸地形演变和生态环境变化中起着重要作用。为了清楚地了解其内在机理，我们利用 SCHISM 的波-流-沉积物模型研究了悬浮沉积物动力学对潮流和波-流相互作用的响应。研究结果表明，研究区域的潮汐具有明显的不对称性，悬浮泥沙浓度（SSC）在一个潮汐周期内发生了显著变化。我们还对波浪-海流相互作用进行了分解，以确定波浪模型和水动力模型中各物理机制的贡献。关于波-流相互作用对 SSC 的各种影响的重要性，应考虑波引起的底剪应力和波引起的辐射应力。水平空间平流的重要性与波浪诱导的底剪应力和波浪诱导的辐射应力相当，且大于其他类型的波能平流。该研究成功地解释了影响海南岛西南部 SSC 变化的所有机制，有助于海岸管理，并可为其他沿海地区提供参考。

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来源期刊

Ocean Modelling 地学-海洋学

CiteScore

5.50

自引率

9.40%

发文量

审稿时长

19.6 weeks

期刊介绍： The main objective of Ocean Modelling is to provide rapid communication between those interested in ocean modelling, whether through direct observation, or through analytical, numerical or laboratory models, and including interactions between physical and biogeochemical or biological phenomena. Because of the intimate links between ocean and atmosphere, involvement of scientists interested in influences of either medium on the other is welcome. The journal has a wide scope and includes ocean-atmosphere interaction in various forms as well as pure ocean results. In addition to primary peer-reviewed papers, the journal provides review papers, preliminary communications, and discussions.