湍流强度、速度方差和速度偏度在林冠与大气交界面处达到最大，同时剪切也达到最强；
The turbulent strength, velocity flux, and skew were the largest at forest-atmosphere interface, as well the wind shear.
方差分析表明：圆筒筛速度是影响谷粒分离率的最重要的参数。
Experimental variance analysis shows that the peripheral velocity of the rotating screen is one of the most important factors which affect the percentage of grain separation from straw and chaff.
协方差速度谱是基于采样数据可以排列成协方差矩阵的特征结构而设计的。
Covariance velocity spectrum is based on the fact that the sampled data can be arranged in eigen structure of covariance matrix.
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