Abstract In wind-resistant designs of high-rise buildings, wind profiles are modeled for strong wind, where atmospheric stability is assumed to be neutral. When wind profiles are modeled from the results of short-term observations, which include few data on strong wind, a method to evaluate atmospheric stability and detect wind profiles under neutral conditions is required. In the present study, the applicability of the Pasquill stability class, a widely used index to evaluate atmospheric stability, was assessed in urban areas. The atmospheric stability evaluated from the Pasquill stability class was compared with that from the Monin–Obukhov length using the observation data obtained in Tokyo. 70% of the data of Pasquill stability class D (neutral class) corresponded to the neutral condition evaluated from the Monin–Obukhov length. Furthermore, the mean wind profiles, which were observed at another site in Tokyo using Doppler lidar, were classified according to the Pasquill stability class. As the Pasquill stability class transformed from unstable to neutral, the power law exponent increased. For the neutral class, the power law exponent was within the error range of previous observations of strong wind. The mean wind profile of the neutral class can approximate that of strong wind appropriately.

中文翻译：

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Pasquill 稳定性等级在城市地区检测中性分层风廓线的适用性的观测评估

摘要 在高层建筑的抗风设计中，风廓线是针对强风建模的，其中大气稳定性被假定为中性。当风廓线根据短期观测结果建模时，其中包括很少的强风数据，需要一种评估大气稳定性和检测中性条件下风廓线的方法。在本研究中，Pasquill 稳定性等级（一种广泛使用的评估大气稳定性的指标）在城市地区的适用性进行了评估。使用在东京获得的观测数据，将 Pasquill 稳定性等级评估的大气稳定性与 Monin-Obukhov 长度的大气稳定性进行了比较。Pasquill 稳定性 D 级（中性级）数据的 70% 对应于从 Monin-Obukhov 长度评估的中性条件。此外，使用多普勒激光雷达在东京的另一个站点观察到的平均风廓线根据 Pasquill 稳定性等级进行分类。随着 Pasquill 稳定性类从不稳定变为中性，幂律指数增加。对于中性类，幂律指数在先前强风观测的误差范围内。中性类的平均风廓线可以适当地近似强风的平均风廓线。