过山气流二维定常模式的实际应用

PRACTICAL APPLICATION OF A TWO-DIMENSIONAL STATIONARY MODEL FOR THE FLOW OVER MOUNTAINOUS AREAS

摘要:

本文对气流流经三种不同水平宽度的地形所产生的动力学效应进行了研究。应用定常的二维模式作数值模拟,结果表明:大尺度地形可影响到山脊上游的大气运动,山脊上游出现下沉气流,造成干燥气候;中尺度山脉促使下游大气产生波状扰动,可影响飞机飞行;小尺度山丘(或建筑群)对气流中的气溶胶扩散会产生影响。充分孓解小尺度地形气流的特点,可给山区城镇工厂烟囱的合理布局以及作物育苗阶段的秧田选地提供依据。

Abstract:

A two-dimensional stationary model is used to examine the dynamical effects produced by the flow over mountainous areas of three horizontal scales. Results from numerical simulation show:(1)large-scale orograph may produce subsidence of air flow upstream of the mountain ridge, thus resulting in dry climate;(2)meso-scale mountain ranges may cause wave motion downstream which may influence aircraft in flight;and(3)small-scale hilly areas(or architectural complexes)may have some influence on the aerosol diffusion in the flow. A better knowledge of the characteristic features of the small-scale orographic flow would help to plan the rational distribution of factories in the mountainous areas and the proper sitting of the rice seedling beds during the seedling stage.