摘要
为了比较城市边缘地区和郊区大气边界层中湍流结构的差异,本文分析了1986年春、夏两季在北京市城市边缘地区和郊区两处大气湍流观测结果.结果表明,由于城市边缘地区的下垫表面具有较高数值的粗糙度,使其近地面层大气受到较强的动力影响,在其湍流速度分量谱曲线;无量纲化湍流速度分量标准偏差,σ_u/u*,σ_v/u*和σ_w/u*;以及无量纲化湍流耗散率φ_ε等湍流特征量在近中性层结条件下显示出与大气稳定度的关系比较微弱.
For purpose to compare the differences of the atmospheric turbulence characteristics between the surface layers of the rural and the border of urban areas, the atmospheric turbulence data collected from the Beijing District in 1986 have been analyzed in the paper. The results demonstrate that : the lower boundary layer in the border of urban area is subjected to a stronger dynamic influences due to the higher surface roughness, some of turbulence characteristics including the spectrum of wind components, normalized variances of wind components and temperature and dimensionless.dissipation display weak relationships with the atmospheric stability under the near neutral stratification condition.
出处
《大气科学》
CSCD
北大核心
1991年第4期87-96,共10页
Chinese Journal of Atmospheric Sciences
基金
"北京市城近郊区大气污染预测预报及其应用"研究课题
关键词
大气
结构特征
湍流
边界层
北京
Atmospheric turbulence
Atmospheric boundary layer
Turbulent spectrum analysis
Turbulent fluctuation variance.
