A333 f平面浅水系における渦流からの重力波放射について(A-33 大気の流れ(3),一般講演)

概要

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Nonlinear numerical experiments of gravity wave radiation from unsteady rotational flow is performed in an f-plane shallow water system with forcing and dissipation. Gravity waves are continuously radiated owing to the unsteady motion of nearly balanced rotational flow. Source of gravity wave is determined in the analogy with the theory of aero-acoustic radiation and it is shown that the strong source exists around the strong rotational flow region. These sources can be approximated well by assuming that the flow is non-divergent. In addition, zonal gravity wave amplitude far from the jet region is calculated by solving the Lighthill equation. By using scale analysis, these amplitude can be estimated by one term only that is related to the latitudinal gradient of the fluid depth times the latitudinal mass flux.
日本流体力学会の論文
2004-08-09