Implementation and comparison of the recent three-dimensional radiation stress theory and vortex-force formalism in an unstructured-grid coastal circulation model
Implementation and comparison of the recent three-dimensional radiation stress theory and vortex-force formalism in an unstructured-grid coastal circulation model
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DOI：
10.1016/j.ecss.2020.106771
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发表时间：
2020-08
影响因子：
2.8
通讯作者：
Meng Xia;Miaohua Mao;Qianru Niu
中科院分区：
文献类型：
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作者：
Meng Xia;Miaohua Mao;Qianru Niu
鉴于河口和海岸动力学中波流相互作用的重要性，重新审视表面重力波对三维（3D）近岸环流的影响至关重要。本文将三维辐射应力（RS）理论和涡动力（VF）理论应用于无结构网格的有限体积共同体海洋模式（FVCOM），研究了三种典型海岸系统中的波致环流，包括理想化的进口、平面和天然的拦岸滩。在理想进气道情况下，3D RS在障碍物和横向边界附近产生了明显的气流，而VF通过进气道前方的破碎和滚柱诱导加速度迫使强气流。这两个模拟表明，垂直变化的波引起的流通显着减少。在波浪斜向入射的平面海滩中，两种方法都成功地产生了表面向岸流和底部底流，以及波浪破碎和滚动引起的沿岸流。然而，三维遥感在海岸线附近产生了不切实际的离岸流。耦合模型进行了验证，在天然的禁止海滩的观察，结果表明，三维RS模型同意稍好于所观察到的沿岸流，而三维VF捕捉的垂直剪切的近岸-离岸流合理。进一步的调查表明，这两种方法都成功地产生了波浪破碎诱导的陆上表面和底部底流，但由于3D RS诱导的不切实际的海上水流，它们位于更远的海上。将波流耦合理论成功地应用于非结构化模式，将对沿海海洋模拟界具有重要意义。
Given the importance of wave–current interaction in estuarine and coastal dynamics, it is crucial to revisit impacts of surface gravity waves on three-dimensional (3D) nearshore circulation. This work investigates wave-induced circulation in three typical coastal systems including an idealized inlet and planar and natural barred beaches, by implementing the recent 3D radiation stress (RS) theory and vortex-force (VF) formalism to an unstructured-grid Finite-Volume Community Ocean Model (FVCOM). In the idealized inlet case, 3D RS generated appreciable currents near barriers and lateral boundaries while VF forced strong flows via breaking and roller-induced accelerations in front of the inlet. Both simulations indicate vertically varying wave-induced circulation that decreases markedly. In the planar beach with obliquely incident waves, both methods successfully produced surface onshore and bottom undertow, as well as the wave breaking and roller-induced longshore currents. Nevertheless, 3D RS generated unrealistic offshore currents close to the shoreline. The coupled models were validated against observations in the natural barred beach, and results indicate that the 3D RS model agrees slightly better with the observed longshore currents while 3D VF captures the vertical shear of the onshore–offshore flows reasonably. Further investigations suggest that both methods produce the wave breaking-induced surface onshore and bottom undertow successfully, yet they are located further offshore resulting from the 3D RS-induced unrealistic offshore currents. Successful implementations of the paired wave–current theories to the unstructured model would be fundamental and beneficial to the coastal ocean modeling community.