Wind field characteristics were investigated with a non-stationary wind speed model at a bridge in a mountain valley, where five anemometers were set along the bridge span for long-term field measurements. The mean wind characteristics, such as mean wind speed and direction, were studied with a traditional steady wind-speed model, which showed the significant influence of the terrain on the mean wind characteristics. In addition, data for certain strong-wind weather conditions were measured, and the non-stationary analysis of strong wind samples were conducted using the run test and wavelet analysis. Subsequently, the characteristics of the fluctuating wind—time-varying mean wind speed, turbulence intensity, turbulence integral scale, and power spectral density (PSD)—were compared based on the two wind speed models. The comparative results indicated that the mountain valley wind field was substantially affected by the terrain and exhibited a strong non-stationarity. However, there were certain differences between the wind field characteristics of the two wind speed models, and the recommended value was not completely consistent for the field measurements in the current specification.

在山谷中的一座桥梁上，利用非平稳风速模型研究了风场特性，其中沿桥跨设置了五个风速计，用于长期现场测量。采用传统的稳态风速模型研究了平均风速和风向等平均风特性，表明地形对平均风特性的影响显着。此外，还测量了某些强风天气条件的数据，并使用运行测试和小波分析对强风样本进行了非平稳分析。随后，基于两种风速模型比较了波动风的特征——时变平均风速、湍流强度、湍流积分尺度和功率谱密度（PSD）。对比结果表明，山谷风场受地形影响较大，表现出较强的非平稳性。但是，两种风速模型的风场特性存在一定差异，目前规范中现场测量的推荐值并不完全一致。