天津市250m低层大气风廓线模式的试验研究

EXPERIMENT STUDY OF THE MODELS OF WIND PROFILES IN 250 M LOWER ATMOSPHERE LAYER IN TIANJIN

本文用天津250m气象塔的风廓线观测资料,检验了M-O相似理论的近地层风廓线模式。结果认为,在中性和不稳定条件下,使用近地层计算得到的L和U_*,M-O相似模式可以较好地推广应用。对稳定层结,用Yokoyama等人提出的U_*一级近似表达式替换常通量层公式中的相应量后,U_*和u/z之间的关系在风向随高度没有明显偏转的层次中仍然成立并且至少可推广应用到120m。

Using measurements of wind profiles from the 250 m, meteorological tower in Tianjin, models of wind profiles derived from the M - O similarity theory in the ground layer were examined. The results show that using the calculated L and u in the ground layer under neutral and unstable conditions, the M - O model can be applied well. For stable stratification, taking the first-order approximation expression of u. suggested by Yokoyama et al. instead of that in the formula for a constant flux layer the relationship between u, and ou/z is valid for the base in which the wind deflection is not obvious with height, and can be valid up to at least 120 m.