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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Subtidal flow and its variability at the entrance to a subtropical lagoon
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Subtidal flow and its variability at the entrance to a subtropical lagoon

机译：亚热带泻湖入口处的潮下水流及其变化

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摘要

Spatial and temporal variability of the subtidal exchange flow at West Pass, an inlet at the entrance to a subtropical lagoon (St. Andrew Bay, Florida), was studied using moored and towed current velocity profiles and hydrographic data. Towed and hydrographic measurements were captured over one diurnal tidal cycle to determine intratidal and spatial changes in flow. Hydrographic profiles over the tidal cycle showed that tidal straining modified density stratification asymmetrically, thus setting up the observed mean flow within the inlet. During the towed survey, the inlet’s mean flow had a two-layer exchange structure that was moderately frictional and weakly influenced by Coriolis accelerations. Moored current profiles revealed the additional contribution to the dynamics from centrifugal accelerations. Along channel residual flows changed between unidirectional and exchange flow, depending on the forcing from the along-estuary wind stress and, to a lesser extent, the spring– neap tidal cycle. Increases in vertical shear in the along channel subtidal flow coincided with neap tides and rain pulses. Lateral subtidal flows showed the influence on the dynamics of centrifugal accelerations through a well-developed two-layer structure modulated in magnitude by the spring– neap tidal cycle.
机译：利用系泊和拖曳的当前速度剖面和水文数据，研究了亚热带泻湖（佛罗里达州圣安德鲁湾）入口处西口的潮汐交换流的时空变化。在一个昼夜潮汐周期中捕获拖曳和水文测量数据，以确定流量的潮内和空间变化。潮汐周期内的水文剖面表明，潮汐应变不对称地改变了密度分层，因此在进口内建立了观测到的平均流量。在拖曳调查中，入口的平均流量具有两层交换结构，该结构具有适度的摩擦力，并且不受科里奥利加速度的影响较小。系泊的电流曲线揭示了离心加速度对动力学的额外贡献。沿河道的残余流量在单向流和交换流之间变化，这取决于沿河口风应力以及较小程度的春潮潮汐周期的强迫。沿河道潮汐流垂直切变的增加与潮汐和降雨脉冲相吻合。潮汐的横向流动通过一个发达的两层结构显示了对离心加速度动力学的影响，该结构由弹簧-潮汐的潮汐调节。

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