A Nonlinear Steady Model for Moist Hydrostatic Mountain Waves
A Nonlinear Steady Model for Moist Hydrostatic Mountain Waves
复制标题
湿静水山波的非线性稳态模型
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
D. Fitzjarrald
中科院分区：
文献类型：
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作者：
A. Barcilon;D. Fitzjarrald
摘要我们考虑由稳定的、稳定分层的湿气流通过二维地形时产生的静力重力波的动力学问题。忽略了科里奥利效应。云区由动力学决定，在该区域内，Brunt-Vaisala频率呈现一个比外部值更小的值。在干燥和多云地区，Brunt-Vaisala频率随高度变化不变。我们认为潮湿的层要么在山上，要么在中层，而且足够深，足以在那一层形成一整片云。流动和下界的非线性影响了这些波的动力学和波阻。后者取决于：1)湿层相对于地面的位置，2)湿润量，3)非线性程度，4)底部地形的对称性偏离。对于对称剖面，当水汽与地形相邻时，减阻效果显著。在所有的案例中。
Abstract We consider the dynamics of hydrostatic gravity waves generated by the passage of a steady, stably stratified, moist flow over a two-dimensional topography. Coriolis effects are neglected. The cloud region is determined by the dynamics, and within that region the Brunt-Vaisala frequency takes on a value smaller than the outside value. In both the dry and cloudy regions the Brunt-Vaisala frequency is constant with height. We consider the moist layer to be either next to the mountain or at midlevels and to be deep enough so that an entire cloud forms in that layer. The nonlinearity in the flow and lower boundary affects the dynamics of these waves and wave drag. The latter is found to depend upon: 1) the location of the moist layer with respect to the ground, 2) the amount of moisture, 3) the degree of nonlinearity and 4) the departure from symmetry in the bottom topography. For symmetrical profiles substantial drag reductions are obtained when the moisture is adjacent to the topography. In all cas...