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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tidal and nontidal exchange at a subtropical inlet: Destin Inlet, Northwest Florida
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Tidal and nontidal exchange at a subtropical inlet: Destin Inlet, Northwest Florida

机译：副热带入口的潮汐和潮汐交换：佛罗里达州西北部的德斯廷湾

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A tidal-cycle study at Destin Inlet, Northwest Florida, investigated intratidal and residual flow structures for the first time across the inlet. Underway current velocity profiles were combined with hydrographic station profiles at neap tides to document the appearance of tidal fronts, the distribution of tidal currents across two cross-sections, and the residual, or non-tidal, flow structure at the same cross-sections. Intratidal variations of water density and velocity showed the presence of fronts both in 1) late ebb-early flood and 2) late flood-early ebb tidal stages. Late ebb-early flood tidal intrusion fronts brought about depth-independent changes in water density >10 kg/m(3) in <2 h. Their counterparts, late flood-early ebb plume-like fronts, produced similar magnitude of variations in density but were depth-dependent. Diurnal tidal current distributions across the inlet followed a general behavior of a damped wave with strongest currents appearing near the surface and near the deepest part of the cross-sections (thalweg). However, curvature effects seemed to modify this behavior locally by shifting the maximum tidal current away from the thalweg. Frictional and curvature effects on the diurnal flows were confirmed by an analytical solution for tidal currents. The observed density gradients drove residual flows that were vertically sheared, with outflow at the surface and inflow near the bottom. Such residual flow distributions were reproduced by an analytical solution that diagnosed the flow structure as inherent of a dynamically narrow inlet with relatively weak frictional effects. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在佛罗里达州西北部的德斯廷湾（Destin Inlet）进行的潮汐研究首次调查了穿过入口的潮汐内和残余水流结构。航行时的流速剖面与潮汐时的水文站剖面相结合，以记录潮汐锋面的出现，潮汐流在两个横截面上的分布以及在相同横截面上的剩余或非潮汐流动结构。潮汐内的水密度和流速变化表明，在1）潮起潮落早期和2）潮水起潮晚期潮汐阶段都存在锋面。潮汐潮潮潮起潮落，潮汐潮汐潮起潮汐潮起潮潮，潮汐潮起潮起，潮水潮起潮潮，潮水潮起潮潮，潮汐潮汐潮起潮起，潮水潮起潮潮，潮水潮起潮潮，潮汐潮起潮潮，潮水潮起潮落，潮水潮起潮落，潮汐潮汐潮起，潮水潮起潮落，潮水潮起潮落，潮汐潮汐侵入，潮汐潮汐潮起潮落，潮汐入侵潮汐潮起潮落，潮汐潮起潮起，潮汐入侵潮起潮落，潮水潮起2个小时。与之相对应的是洪水后期的早期潮汐状羽状锋，其密度变化幅度相似，但与深度有关。整个进水口的昼夜潮汐电流分布遵循阻尼波的一般行为，其中最强的电流出现在横截面的最深处（thalweg）附近。但是，曲率效应似乎通过将最大潮流从海藻移开而局部改变了这种行为。通过潮流分析解决方案，证实了摩擦和曲率对日流量的影响。观察到的密度梯度驱使残余流量垂直剪切，表面流出，底部流入。这种残留的流量分布是通过分析解决方案重现的，该解决方案将流结构诊断为动态狭窄入口的固有特性，且摩擦力相对较弱。 （C）2015 Elsevier Ltd.保留所有权利。

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