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首页> 外文期刊>Journal of Physical Oceanography >Dependence of Wind-Driven Current on Wind Stress Direction in a Small Semienclosed, Homogeneous Rotating Basin
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Dependence of Wind-Driven Current on Wind Stress Direction in a Small Semienclosed, Homogeneous Rotating Basin

机译：小型半封闭均质旋转盆地中风驱动电流对风应力方向的依赖性

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摘要

The dependence of wind-driven current (WDC) on wind stress direction in a small semienclosed, homogeneous rotating basin is investigated using a linear steady-state analytical model based on Ekman solutions. The model is applicable to the middle of the basin (midbasin), and the current is driven by a constant wind stress of an arbitrary direction. The WDC is made up of wind stress-driven current (WSDC) and pressure-driven current (PDC) components. The laterally varying water depth of the basin confines the total volume transport in the longitudinal direction while the wind stress-driven volume transport changes direction according to the wind stress direction. Therefore, the pressure-driven volume transport or, equivalent, the pressure gradient depends on the wind stress direction: the relationship between the pressure gradient and the wind stress is anisotropic. As a result, the midbasin WDC is also dependent on the wind stress direction. The dependence varies according to the lateral position and Ekman number E. For large E (small rotation), the longitudinal volume transport is generally proportional to the longitudinal wind stress component. Hence, the ratio of the volume transport driven by the wind stress of direction θ (θ > 0) to that driven by the longitudinal wind stress (θ = 0) becomes cosθ. For small E (large rotation), the ratio becomes larger than cosθ. The extent to which each component of wind stress contributes to the generation of the pressure gradient to satisfy no-net-longitudinal and no-lateral transports is determined by a wind stress-pressure gradient transformation matrix, whose components depend on the lateral position and E.
机译：使用基于Ekman解的线性稳态分析模型，研究了小型半封闭均质旋转盆地中风驱动电流（WDC）对风应力方向的依赖性。该模型适用于盆地中部（中流域），并且电流由任意方向的恒定风应力驱动。 WDC由风应力驱动电流（WSDC）和压力驱动电流（PDC）组件组成。流域横向变化的水深限制了沿纵向的总体积传输，而风应力驱动的体积传输根据风应力方向改变方向。因此，压力驱动的体积输运或等效的压力梯度取决于风应力方向：压力梯度与风应力之间的关系是各向异性的。结果，中流域WDC也取决于风应力方向。依存关系随横向位置和Ekman数E而变化。对于大E（小旋转），纵向体积传输通常与纵向风应力分量成比例。因此，由方向为θ（θ> 0）的风应力驱动的体积传输与由纵向方向为风向的应力（θ= 0）驱动的体积传输之比变为cosθ。对于小E（大旋转），该比率大于cosθ。风应力各分量对压力梯度的生成做出贡献的程度，以满足无净纵向和无侧向传输，这取决于风应力-压力梯度变换矩阵，其分量取决于横向位置和E 。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第7期|P.1488-1500|共13页
  • 作者

    Hirofumi Hinata; Nobuyoshi Kanatsu; Satoshi Fujii;

  • 作者单位

    Coastal Zone Systems Division, Coastal and Marine Department, National Institute for Land and Infrastructure Management, 3-1-1 Nagase, Yokosuka, Kanagawa 239-0826, Japan;

    Kokusai Kogyo Co., Ltd., Tokyo, Japan;

    rnDepartment of Electrical and Electronics Engineering, University of the Ryukyus, Nishihara, Japan;

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