| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2014: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2013: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2012: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
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| Outline of Final Research Achievements |
An accurate representation of ocean mixing processes over rough bathymetry is essential in global circulation models. We perform a series of eikonal calculations for a wide range of parameters, namely, the amplitude (Uo) of tidal flow with semidiurnal frequency (Ω) and the horizontal wavenumber (k) of the bottom topography to see how upward propagating internal waves generated by tide-topography interactions donate their energy to dissipation through nonlinear interactions with the background internal waves. It has been shown that the resulting mixing hotspot becomes concentrated nearer the ocean bottom as k increases for kUo/Ω<1 independent of Uo, whereas it extends vertically upward as Uo increases for kUo/Ω>1 independent of k. An interpretation for these calculated results has been made in terms of the vertical group velocity and the life time for each of linear internal tides and quasi-steady lee waves emanating from the ocean bottom for kUo/Ω<1 and kUo/Ω>1, respectively.
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