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根据大气近地面层对流湍流池的实验结果 ,提出了一种用于描述大尺度相干结构的立体模型———椭球结构模型。计算并分析了该大尺度相干结构对光传输波前相位结构函数的影响 ,且和小尺度湍流结构作了比较。对于相同的参数 ,光线平行于间断面时造成的影响大于垂直于间断面 ;一般情况下 ,影响都很小 ;但当光线平行穿过具有三角波模型结构的间断面时可能产生较大的影响。
According to the experimental results of the convective turbulent pool in the near-surface atmosphere, a three-dimensional model called ellipsoid model is proposed to describe the large-scale coherent structures. The influence of the large-scale coherent structure on the phase structure function of the optical transmission wavefront is calculated and analyzed, and compared with the small-scale turbulence structure. For the same parameters, the influence of the light parallel to the discontinuity is greater than perpendicular to the discontinuity; in general, the influence is small; however, it may have a greater impact when the light passes parallel through the discontinuity with the triangular wave model structure.