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Tidally discontinuous ocean forcing in bar-built estuaries: The interaction of tides, infragravity motions, and frictional control

机译:在酒吧建造的河口中持续不断的海洋强迫:潮汐,重力运动和摩擦控制的相互作用

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摘要

Shallow, bar-built estuaries on wave-dominated coasts in Mediterranean climates experience an intermittent connection to the ocean. In the presence of low streamflow, their inlets may completely close as a result of nearshore sand transport, but even in the open condition, these inlets remain constricted. Extensive field measurements in the highly salt-stratified Pescadero estuary in northern California show that the shallow mouth causes these estuaries to experience discontinuous tidal forcing. While the ocean and estuary are fully connected with near-equal water levels, tidal velocities are slow but infragravity motions in the nearshore induce large velocity oscillations within the estuary. As the ocean tide falls, infragravity forcing is cut off, because the estuarine mouth is perched above the low tide ocean water level, and ebbing velocities are set by bed friction. Observations reveal this oscillation between ocean-forced and frictionally controlled conditions characterizes and sets estuarine hydrodynamics. Additional wave setup of the lagoon emphasizes the dependence of these estuaries on nearshore ocean conditions, but the diurnal or semidiurnal retreat of the ocean below the mouth cuts off this nearshore influence so it too is tidally varying. Here we present detailed observations and a framework for understanding hydrodynamics in small, shallow bar-built estuaries.
机译:在地中海气候中以波浪为主的海岸上,由酒吧建造的浅河口断续与海洋相连。在低流量的情况下,由于近岸沙土运输,它们的进口可能会完全关闭,但即使在开放状态下,这些进口也仍然狭窄。在加利福尼亚北部高度盐分分层的佩斯卡德罗河口进行的广泛野外测量表明,浅口使这些河口经历了不连续的潮汐强迫。虽然海洋和河口与几乎相等的水位完全相连,但潮汐速度较慢,但​​近岸的重力运动在河口内引起大的速度振荡。随着海潮下降,由于河口位于低潮海平面以上,并且由于层间摩擦力而使速度下降,因此,重力减弱作用得以消除。观测结果表明,在海洋强迫和摩擦控制的条件之间的这种振荡表征并设定了河口流体动力学。泻湖的附加波浪形成突显了这些河口对近岸海洋条件的依赖性,但是嘴下方海洋的昼夜或半昼夜退缩切断了这种近岸影响,因此它的变化也很大。在这里,我们介绍了详细的观察结果和一个框架,用于理解小型浅条形河口中的流体动力学。

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    Williams M.E.; Stacey M.T.;

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  • 年度 2016
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  • 正文语种 en
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