贴地层通量与廓线关系的初步研究

A PRELIMINARY STUDY OF FLUX-PROFILE RELATIONSHIPS IN THE GROUND LAYER

以相似理论为基础,利用地面梯度观测资料,采用迭代方法确定湍流特征参量u.、T.和L,拟合出普适函数φ(Z/L)、φ(R_i)的半经验表达式以及特征长度L与稳定度因子ΔT/(Δu)~2之间的经验关系,讨论了湍流通量和温风廓线随稳定度参数的变化现律,并得出计算贴地层湍流通量的梯度方法。

On the basis of the Monin-Obukhov similarity theory,the turbulence char-acteristic parameters.U.,T. and L are determined by means of the iteration method,us-ing the ground gradient observational data. The Semi-empirical expression of the uni-versal functions Φ(Z/L) and Φ(R_i), and the empirical relationship between Monin-Obukhov length L and stability factor ΔT/(ΔU)~2 are thus given. The change of turbulenceflux and temperature-wind profile with the stability parameter is examined and themethod of calculating the turbulence flux in the ground layer is provided.