薄层旋转流体$β$ -平面模型的数学研究
Mathematical study of the $β$-plane model for rotating fluids in a thin layer
摘要：
本文讨论了一个描述具有非均匀旋转矢量的快速旋转不可压缩流体的渐近行为的海洋学模型;运动发生在薄层中。首先，我们展示了一个固定的解决方案的系统，其中包括一个内部部分和边界层部分。旋转矢量的空间变化在边界层内产生强烈的奇异性，这对解的内部部分产生影响。文章的第二部分致力于二维和三维波的分析。结果表明，薄层效应通过产生小尺度来改变三维庞加莱波的传播。使用半经典分析的工具，我们证明了能量传播的速度为一阶，即比传统的旋转流体模型慢得多。
英文摘要：
This article is concerned with an oceanographic model describing the asymptotic behaviour of a rapidly rotating and incompressible fluid with an inhomogeneous rotation vector; the motion takes place in a thin layer. We first exhibit a stationary solution of the system which consists of an interior part and a boundary layer part. The spatial variations of the rotation vector generate strong singularities within the boundary layer, which have repercussions on the interior part of the solution. The second part of the article is devoted to the analysis of two-dimensional and three-dimensional waves. It is shown that the thin layer effect modifies the propagation of three-dimensional Poincaré waves by creating small scales. Using tools of semi-classical analysis, we prove that the energy propagates at speeds of order one, i.e. much slower than in traditional rotating fluid models.
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