Reef Flat Flow Dynamics for a Nearly Closed Fringing Reef Lagoon: Ofu, American Samoa
Reef Flat Flow Dynamics for a Nearly Closed Fringing Reef Lagoon: Ofu, American Samoa
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DOI：
10.1029/2022jc018831
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发表时间：
2022-10-01
影响因子：
3.6
通讯作者：
Monismith, Stephen G.
中科院分区：
文献类型：
--
作者：
Maticka, Samantha A.;Rogers, Justin S.;Monismith, Stephen G.
我们讨论了对美属萨摩亚奥富礁石系统中潮汐变化的波浪力流的观测，这是一个在低潮时开放、在高潮时关闭的堡礁和泻湖系统。高潮时，自由表面压力梯度几乎与深度积分动量方程中的辐射应力梯度平衡。在深度处，这两种力之间存在不平衡，产生暗流和沿海岸转向的水流，并且在某些时候转向近海，其行为类似于在海滩上观察到的离岸流。退潮时，波浪力纯粹驱动岸上水流。一般来说，波浪传输对于确定总净传输很重要。虽然泻湖的动态封闭性质在很大程度上抑制了跨礁石运输，但总有一些水流通过泻湖，其中最强的水流发生在高潮时和波浪力最强时。
We discuss observations of tidally varying wave-forced flows in the reef system on Ofu, American Samoa, a barrier reef and lagoon system that appears open at low tide and closed at high tide. At high tide, the free-surface pressure gradient nearly balances the radiation stress gradient in the depth-integrated momentum equation. At depth, there is an imbalance between these two forces, generating an undertow and flows that turn alongshore, and for some of the time, offshore, behavior similar to rip currents observed on beaches. At low tides, the wave forcing drives purely onshore flows. In general, wave transport is important to determining the total net transport. While the dynamically closed nature of the lagoon mostly suppresses cross-reef transport, there is always some flow through the lagoon with the strongest flows occurring at high tides and when the wave forcing is strongest.