二层模式中小地形对于气压跳跃形成的初步研究

A PRELIMINARY INVESTIGATION FOR THE FORMATION OF PRESSURE JUMP PRODUCED BY THE MOUNTAIN IN A TWO-LAYER MODEL

本文应用一个两层密度不同的流体所组成的模式,讨论了小地形对于气流的影响。由一维常定问题的解指出,对于气流一定的上游条件,山脉存在一临界高度;山区气流的被扰状态,决定于上游条件和山的高度。当上游状态中的弗罗德(Froude)数小于1,而山脉的高度等于临界高度时,背风面将出现常定的“气压跳跃”。也由一维非常定的解,研究了“气压跳跃”的形成过程。

Applying a two-layer model the pressure jump formed on the lee side is investigated for one dimensional stationary and non-stationary cases. The conditions for the formation of the stationary pressure jump are that the Froudc number of the upwind side is smaller than unit and the height of mountain would be equal to a critical value.