边界层风温场的数值研究

NUMERICAL RESEARCH OF WIND AND TEMPERATURE FIELDS IN BOUNDARY LAYER

利用改进的边界层模式,对平坦地形条件下的非定常边界层风温场进行了数值模拟。着重考察了边界层风温场结构受迫于地面温度变化而伴随的时间变化问题,通过对各种不同型式的初始风场在不同的初始温度层结下,风温场时空演变过程的数值计算,揭示边界层风温场日变化的物理机制、相互联系,以及不同型式的初始风温场对夜间急流的影响。

Using the improved boundary layer model, under horizontal homogeneous geog-raphical conditions, the nonconstant wind and temperature fields have been simulated numerically. The problem of wind and temperature fields structure in boundary layer changing with time forced by surface temperature varing has been emphasized- By virture of numerical calculating for variation process of initial wind field of different pattern in different temperature stratification conditions, which varies with the time and space, the physical mechanism of daily variation of wind and temperature fields in boundary layer and their relationship have been showed. The fact that the nocturnal jet in boundary layer influenced by initial wind and temperature fields of different pattern has been suggested as well.