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首页> 外文期刊>Journal of oceanography >Transformation of the Indonesian Throughflow Water by Vertical Mixing and Its Relation to Tidally Generated Internal Waves
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Transformation of the Indonesian Throughflow Water by Vertical Mixing and Its Relation to Tidally Generated Internal Waves

机译：垂直混合对印尼通水的转化及其与潮汐内波的关系

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Numerical experiments with two-dimensional nonhydrostatic model have been performed to investigate tidally generated internal waves at the Dewakang sill at the southern Makassar Strait where two large-amplitude “bumps” of relatively shallow water exist. We investigate the effect of these features on vertical mixing, with emphasis on the transformation of the Indonesian throughflow (ITF) water properties. The result shows that large-amplitude internal waves are generated at both bumps by the predominant M2 tidal flow, even though the condition of the critical Froude number and the critical slope are not satisfied. The internal waves induce such vigorous vertical mixing in the sill region that the vertical diffusivity attains a maximum value of 6 × 10?3 m2s?1 and the salinity maximum and minimum core layers characterizing the ITF thermocline water are considerably weakened. Close examination reveals that bottom-intensified currents produced mainly by the joint effect of barotropic M2 flow and internal tides generated in the concave region surrounding both bumps can excite unsteady lee waves (Nakamura et al., 2000) on the inside slopes of the bumps, which tend to be trapped at the generation region and grow into large-amplitude waves. Such generation of unsteady lee waves does not occur in case of one bump alone. Trapping and amplification of the waves in the sill region induce large vertical displacements (～60 m) of water parcels during one tidal period, leading to strong vertical mixing there. Since the K1 tidal currents are relatively weak, large-amplitude internal waves causing intense vertical mixing are not generated.
机译：已经进行了二维非静水力模型的数值实验，以调查潮汐产生的内波，该波是在孟加锡海峡南部的Dewakang坎台上存在的，那里存在两个大幅度“隆起”的相对浅水区。我们研究了这些功能对垂直混合的影响，重点是印尼通水（ITF）水质的转变。结果表明，即使不满足临界弗洛德数和临界斜率的条件，M2的主要潮汐流也会在两个隆起处产生大振幅的内波。内部波在窗台区域引起剧烈的垂直混合，使得垂直扩散率达到最大值6×10？3 m2s？1，并且显着削弱了表征ITF跃迁水的盐度最大和最小核心层。仔细检查发现，由正压M2流和两个隆起周围的凹陷区域产生的内部潮汐共同作用产生的底部增强电流会在隆起的内坡上激发不稳定的背风（Nakamura等，2000），它们倾向于被束缚在发电区并长成大振幅波。单靠一个撞击就不会发生这种不稳定的背风。在一个潮汐期，波峰在基石区域的陷波和放大引起水域大的垂直位移（〜60 m），导致在那里强烈的垂直混合。由于K1潮流相对较弱，因此不会产生引起强烈的垂直混合的大振幅内部波。

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