Nature of Streaky Structures Observed with a Doppler Lidar
Nature of Streaky Structures Observed with a Doppler Lidar
复制标题
用多普勒激光雷达观察到的条纹结构的性质
DOI：
10.1007/s10546-016-0213-2
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发表时间：
2017
影响因子：
4.3
通讯作者：
Y. Fujiyoshi
中科院分区：
文献类型：
--
作者：
Ayako Yagi;A. Inagaki;M. Kanda;C. Fujiwara;Y. Fujiyoshi
在城市地区使用三维扫描相干多普勒激光雷达进行的观测揭示了高雷诺数流的粗糙、不均匀表面上方的条纹结构的特征。研究重点是两点：（1）条纹结构出现的频率和存在所需的条件；（2）条纹结构间距的普遍标度（。径向速度的水平快照直观地分为六组：条纹、混合、鱼网、无条纹、前线和其他。条纹类别占所有可能流的50%以上，发生在水平风速较大且大气层结较严重的情况下。接近中性。间距（根据沿翼展方向的流向速度脉动的功率谱密度估计。间距随着局部速度梯度的增加而减小。此外，还揭示了由摩擦速度和边界层高度归一化的局部速度梯度（在各种实验和环境条件下，在运动规模（即室内和室外尺度）、热分层（即从弱不稳定到稳定）方面进行了综合预测）分层）和表面粗糙度（即从平坦到非常粗糙的表面）。
Observations using a three-dimensional scanning coherent Doppler lidar in an urban area revealed the characteristics of streaky structures above a rough, inhomogeneous surface for a high-Reynolds-number flow. The study focused on two points: (1) the frequency of occurrence and conditions required for the presence of streaky structures, and (2) the universal scaling of the spacing of streaky structures (. The horizontal snapshots of the radial velocity were visually classified into six groups: Streak, Mixed, Fishnet, No streak, Front, and Others. The Streak category accounted for more than 50% of all possible flows and occurred when the horizontal wind speed was large and the atmospheric stratification was near-neutral. The spacing (was estimated from the power spectral density of the streamwise velocity fluctuations along the spanwise direction. The spacingdecreased with an increase in the local velocity gradient. Furthermore, it was revealed that the local velocity gradient normalized by the friction velocity and the boundary-layer height (comprehensively predictsunder various experimental and environmental conditions, in terms of the scale of motion (i.e., indoor and outdoor scales), thermal stratification (i.e., from weakly unstable to stable stratification), and surface roughness (i.e., from flat to very rough surfaces).
类似城市表面的近中性惯性亚层中对流边界层的内层和外层湍流的影响。
影响因子：
4.3
作者：
Castillo;M. C.;Inagaki;A.;Kanda;M.
通讯作者：
M.