| 초록 |
Under the conditions of hydrostatic,geostrophic balance,and uniform west wind,the stratified flow over a three-dimensional(3D) elliptical mountain is simulated by a storm-scale numerical model(ARPS).In this paper a series numerical experiments were conducted to study the impacts of the mountain Fr number and the upstream flow orientation on the flow over three-dimensional mountain and the downstream boundary layer structure.The flow over 3D mountain is characterized by a string of phenomena,such as upstream block,downstream acceleration and gravity wave breaking and so on.Owning to the effect of Coriolis,these characters all become to be asymmetric.When the Fr number(mountain height) is increasing,the stronger upstream block,downstream jets and more asymmetric flow pattern over mountain are produced,especially the south orographic jet benefits more from the Fr number increase.In the dry flow over mountain,the boundary layer TKE is dominated by the low-level vertical wind shear of mountain flow. |
