Non‐Linear Three‐Dimensional Effects On Gravity‐Wave Drag: Splitting Flow and Breaking Waves
Tóm tắt
A study has been made of some aspects of frictionless stratified flow past three‐dimensional isolated mountains. the study uses a three‐dimensional non‐hydrostatic numerical model to investigate the behaviour of the flow as a function of the Froude number, and produces a picture of the dependence of the gravity‐wave drag on the Froude number for a wide range of that parameter. At the same time, the results of the numerical experiments clarify the behaviour of the flow in the transition from high to low Froude number, showing the relative importance of wave breaking and flow splitting in the transitional regime.
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Tài liệu tham khảo
Baines P. G.andPalmer T. N. 1990‘Rationale for a new physically‐based parametrization of subgridscale orographic effects’. ECMWF Tech. Mem. No. 169
Eliassen A., 1961, On the transfer of energy in stationary mountain waves, Geofys. Publ., 22, 1
Gill A. E., 1982, Atmosphere‐ocean dynamics
Miranda P. M. A. 1991‘Gravity waves and wave drag in flow past three‐dimensional isolated mountains’ PhD Thesis University of Reading
Palmer T. N., 1986, Alleviation of a systematic westerly bias in general circulation and numerical weather prediction models through an orographic gravity wave drag parametrization, Q. J. R. Meteorol. Soc., 12, 1001, 10.1002/qj.49711247406
1980, Linear theory of stratified hydrostatic flow past an isolated mountain, Tellus, 32, 348, 10.3402/tellusa.v32i4.10590
1989, Reply to Smith (1989b), J. Atmos. Sci., 46, 3614
1992, A mesoscale numerical model using the non‐hydrostatic pressure‐based α‐coordinate equations: Model experiments with dry mountain, flow. Mon. Weather Rev., 119, 1168