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On the inclusion of Stokes and Ekman surface currents into hydrodynamic models

机译:将Stokes和Ekman表面电流纳入流体动力学模型

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Recently published results (Mao and Heron, J. Phys. Oceanog., 2008) comparing sea surface currents, measured by a 30 MHz ocean radar with wind speed and direction under a range of conditions in Bass Strait, Victoria, Australia indicate that the coupling between wind and surface currents depends on the maturity of the sea wave spectrum. For a mature sea the main contribution to surface current is usually Stokes drift, while in developing sea conditions the Stokes drift is reduced and Ekman-type stress is the main contributor to surface currents. At short fetches where stress driven currents dominate the net surface current has the Ekman angular offset of up to 45 degrees. At long fetches this angle falls to a value around 10-15 degrees and depends on wind speed. The inclusion of these parameters into hydrodynamic models requires knowledge of the age of the wave spectrum and wind speed and direction at any given site. The Stokes component of the surface current is in the direction of the dominant waves, and the Ekman component of the surface current veers in a direction consistent with the Coriolis parameter.
机译:最近公布的结果(Mao和Heron,J. Phys。Oceogog。,2008)比较海面电流,通过30 MHz海洋雷达测量,在维多利亚州巴斯海峡的一系列条件下,澳大利亚的一系列条件表明联轴器风和表面电流之间取决于海波谱的成熟度。对于成熟的海洋,表面电流的主要贡献通常是斯托克斯漂移,而在开发的海洋情况下,斯托克斯漂移减少,ekman型应力是表面电流的主要因素。在短暂的提取时,应力驱动的电流主导净表面电流的Ekman角偏移量高达45度。长时间提取此角度落到约10-15度的值,并取决于风速。将这些参数包含到流体动力学模型中需要在任何给定部位的波谱和风速和方向的年龄。表面电流的Stokes部件在主导波的方向上,并且表面电流接地的Ekman分量在与科里奥利参数一致的方向上。

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    《OCEANS》|2008年||共5页
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    Heron M.L.;

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  • 中图分类 P75-53;
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