摘要
流场如何适应非均匀地表面是微气象学的一个重要问题。本文通过建立一个包含地面过程参数化和水温预报方案的非静力平衡中小尺度数值模式来研究过水体气流流速改变的空间结构和变化规律。结果表明:由于水体使表面粗糙度有脉冲式跃变,当较强气流流过时,形成两个内边界层,这两个内边界层在空间交汇呈“舌状”分布,在此之内流速增大,并且地面粗糙度愈大,流速增大愈多。大气层结明显地影响过水体气流流速的改变,造成流速改变有明显的日变化和季节性变化。过水体气流流向改变不大。
How the flow responds to the various type of surface inhomogeneity is an important problem in micrometeorology. In this study a two-dimensional non - hydrostatic numerical model is developed to predict the spatial structure and variation characteristics of the flow over inland water body. The results show that when air flows over an inland water body, the pulse changes in surface roughness result in the formation of two internal boundary layers, which meet to the leeward shore of the water body, forming a 'tonque' like spatial distribution The larger the land surface roughness, the larger the change of velocity of the ait folw over the inland water body will be. Atmospheric stability affects the change substantially, causing diurnal and seasonal changes in it.
出处
《热带气象》
CSCD
1992年第1期27-34,共8页
基金
国家自然科学基金资助课题
