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首页> 外文期刊>Journal of Physical Oceanography >Dynamics and Energetics of Trapped Diurnal Internal Kelvin Waves around a Midlatitude Island
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Dynamics and Energetics of Trapped Diurnal Internal Kelvin Waves around a Midlatitude Island

机译：中纬度岛周围被困的昼间内部开尔文波的动力学和能量学

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摘要

The generation of trapped and radiating internal tides around Izu-Oshima Island located off Sagami Bay, Japan, is investigated using the three-dimensional Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier-Stokes Simulator (SUNTANS) that is validated with observations of isotherm displacements in shallow water. The model is forced by barotropic tides, which generate strong baroclinic internal tides in the study region. Model results showed that when diurnal K-1 barotropic tides dominate, resonance of a trapped internal Kelvin wave leads to large-amplitude internal tides in shallow waters on the coast. This resonance produces diurnal motions that are much stronger than the semidiurnal motions. The weaker, freely propagating, semidiurnal internal tides are generated on the western side of the island, where the M-2 internal tide beam angle matches the topographic slope. The internal wave energy flux due to the diurnal internal tides is much higher than that of the semidiurnal tides in the study region. Although the diurnal internal tide energy is trapped, this study shows that steepening of the Kelvin waves produces high-frequency internal tides that radiate from the island, thus acting as a mechanism to extract energy from the diurnal motions.
机译：使用3D斯坦福非结构化非静水地形跟随自适应Navier-Stokes模拟器（SUNTANS）调查了日本相模湾附近的伊豆大岛岛附近被诱捕和辐射的内部潮汐的产生，并通过等温线位移的观测进行了验证浅水。该模型是由正压潮强迫形成的，在研究区域内会产生强烈的斜压内潮。模型结果表明，当日K-1正压潮占主导地位时，被困的内部开尔文波的共振会导致海岸浅水区的大幅度内部潮汐。这种共振产生的昼夜运动比半昼夜运动强得多。岛的西侧产生较弱的，自由传播的半日内潮，M-2内潮波束角与地形坡度相匹配。研究区日内潮引起的内波能量通量比半日潮高得多。尽管昼夜内潮能量被捕获，但这项研究表明，开尔文波的陡峭产生了从岛屿辐射的高频内潮，从而充当了从昼间运动中提取能量的机制。

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  • 来源
    《Journal of Physical Oceanography》 |2017年第10期|2479-2498|共20页
  • 作者

    Masunaga Eiji; Fringer Oliver B.; Kitade Yujiro; Yamazaki Hidekatsu; Gallager Scott M.;

  • 作者单位

    Ibaraki Univ, Ctr Water Environm Studies, Mito, Ibaraki, Japan;

    Stanford Univ, Bob & Norma St Environm Fluid Mech Lab, Dept Civil & Environm Engn, Stanford, CA 94305 USA;

    Tokyo Univ Marine Sci & Technol, Dept Ocean Sci, Tokyo, Japan;

    Tokyo Univ Marine Sci & Technol, Dept Ocean Sci, Tokyo, Japan|Japan Sci & Technol Agcy, CREST, Tokyo, Japan;

    Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA;

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