低空风切变极易对起降过程中的飞行器、风力发电机的结构产生破坏性影响。简要介绍了低空风切变及风切变的危害,详细介绍了相干多普勒激光 雷达的工作原理和低空风廓线反演算法,以及利用风廓线、风矢量图、风速梯度图等观测数据提取风切变的方法。分析了2015年春季北京首都机场 低空风切变个例发生的气象条件和风切变强度。实验结果表明相干多普勒测风激光雷达能有效探测分析低空风切变。

Low-level wind shear can affect aircraft during taking-off and landing phases and the structure of wind turbines in disastrous ways. The principle and parameters of coherent Doppler lidar(CDL) were explained briefly and the method of retrieving wind profiles from line of sight (LOS) wind speed was introduced in detail. The data analysis is based on CDL configured at Beijing Capital International Airport (BCIA) in spring of 2015. Wind profiles time series and wind speed gradient were illustrated to identify the low-level wind shear. The results show that CDL is an effective tool to capture the low-level wind shear events.