夹卷层大尺度相干结构运动特征的室内模拟研究

大尺度相干结构是大气边界层中一种重要的物理现象。本文利用室内水槽模拟方法模拟对流边界层的发生发展，利用实验获取的光斑图像对夹卷层大尺度结构进行了研究。通过分析实验采集的光斑图样中大尺度相干结构的闪烁特性，发现其对应于光斑中长而亮的条纹，而在闪烁指数廓线中对应于峰。根据大尺度结构的这种闪烁特征，本文提出了一种空间相关方法计算其垂直平均速度，并对大尺度结构的运动特征进行了分析，结果表明，边界层顶部热泡以缓慢运动为主，其驱动了边界层顶部的发展。

Laboratory Simulation Study of Characteristic of Large Scale Coherent Structure Movement in Entrainment Layer

Large scale coherent structure,a physical phenomenon of major importance in atmospheric boundary layer,is observed in laboratory tank simulation.By analyzing its scintillation characteristics in beam pattern,it's found that the structure corresponds to the long and bright stripe in beam pattern,and the peak in scintillation index profile,so its vertical average velocity can be obtained by the spatial cross-correlation of scintillation index.And,by means of spatial correlation,vertical movement characteristi...