粤东复杂地形上空的大气湍流强度及扩散参数

ATMOSPHERIC TURBULENCE INTENSITY AND DIFFUSION PARAMETER OVER COMPLICATED TOPOORARH OF EASTERN GUANGDON

在具有复杂下垫面的粤东梅州市采用追踪平衡球的双经纬仪观测和美制ＧＩＬＬ三轴风速仪观测，分别测定了该地区拉格朗日系统和欧拉系统的湍流脉动量。然后用不同参照系的泰勒公式，分别计算出大气的水平和垂直的湍流强度及扩散参数，并与ＰＧ法之计算值和ＢＮＬ实验结果比较，发现距地面１００ｍ以上高空在各类稳定度层结条件下大气扩散参数均比ＰＧ值和ＢＮＬ值偏大。

Based on observations by a dual-thodolite anemometer tracking balanced balloons and an American Gill UVW anemogtaph for complccatedeunderlying surface in Meizhou, eastern Guangdong, turbulent fluctuations of the Lagrangina and Eulerian systems are determined for the area.Following the Taylor formular in respecttto a few reference frames, horizontal and vertical turbulence intensity and atmospheric diffusion parameters σy and σx are then computed and compered with those obtained by the PG method ann BNL experiments. It is found that within heights less than 100m above the ground σy aegeσx are larger than values of PG and BNL with all conditions of stability and siratification.