深圳地区多普勒测风激光雷达的湍流观测

激光雷达可以快速实现对大气风场的非侵入测量, 获得精确三维风矢量。为验证测风激光雷达观测湍流的可 行性并获得湍流观测特征, 利用相干多普勒激光雷达在深圳杨梅坑进行湍流观测实验。依据 Reynolds 分解原理, 应用 小波分解获取湍流脉动并分析大气的湍流运动特征。结果表明: 观测地日平均湍流强度呈现“单峰单谷”结构, 与实验 期间气温的变化呈现较高相关性; 湍流动能引起垂直方向上的输送主要集中在日间 12:00 后, 与湍流耗散率的相关系 数达 0.77; 湍流功率谱密度在惯性副区内基本符合 Kolmogorov“-5/3” 定律。研究结果验证了测风激光雷达可以较为 精确地估算湍流参数。

Observation of Turbulence Using Doppler Wind Lidar in Shenzhen

Lidar can quickly realize non-invasive measurement of atmospheric wind field and obtain accurate wind vectors. In order to verify the feasibility of turbulence observation with lidar and obtain the turbulent characteristics, an observation experiment was carried out in Shenzhen, China, by using coherent Doppler lidar. According to the principle of Reynolds decomposition, wavelet decomposition is used to obtain the turbulent pulsating and analyze the turbulent motion characteristics. The results show that daily average turbulence intensity in Shenzhen presents a “single peak and single valley” structure, which is correlated with the temperature change during the observation. The vertical transportation caused by turbulent kinetic energy is mainly concentrated after 12:00 in the daytime and the correlation coefficient between turbulent kinetic energy and turbulent dissipation rate is 0.77. The turbulent power spectral density is basically consistent with Kolmogorov “-5/3” law in the inertial sub-range. The research results verify that the wind lidar can estimate the turbulence parameters accurately.