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Measurements of wind turbulence parameters by a conically scanning coherent Doppler lidar in the atmospheric boundary layer

机译:通过圆锥扫描相干多普勒激光雷达在大气边界层中测量的湍流参数

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摘要

The method and results of lidar studies of spatiotemporal variability of windturbulence in the atmospheric boundary layer are reported. The measurementswere conducted by a Stream Line pulsed coherent Doppler lidar (PCDL) with the use of conical scanning by a probing beam around the vertical axis. Lidar data are used to estimate the kinetic energy of turbulence, turbulent energydissipation rate, integral scale of turbulence, and momentum fluxes. Thedissipation rate was determined from the azimuth structure function of radialvelocity within the inertial subrange of turbulence. When estimating thekinetic energy of turbulence from lidar data, we took into account theaveraging of radial velocity over the sensing volume. The integral scale ofturbulence was determined on the assumption that the structure of randomirregularities of the wind field is described by the von Kármánmodel. The domain of applicability of the used method and the accuracy of the estimation of turbulence parameters were determined. Turbulence parameters estimated from Stream Line lidar measurement data and from data of a sonic anemometer were compared.
机译:报道了激光雷达研究大气边界层中湍流时空变化的方法和结果。测量是通过流线脉冲相干多普勒激光雷达(PCDL)进行的,并使用锥形扫描通过围绕垂直轴的探测光束进行。激光雷达数据用于估算湍流的动能,湍流的能量耗散率,湍流的积分比例和动量通量。耗散率是根据湍流惯性子范围内径向速度的方位角结构函数确定的。当从激光雷达数据估计湍流的动能时,我们考虑了在感测体积上径向速度的平均值。湍流的整体尺度是在假设风场的随机不规则结构由冯·卡尔曼模型描述的假设下确定的。确定了所使用方法的适用范围和湍流参数估计的准确性。比较了从Stream Line激光雷达测量数据和声速计数据估计的湍流参数。

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