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春季内蒙古草原地区湍流强度及其相似性函数

, PP. 1087-1094

Keywords: 湍流强度,速度方差,相似性函数,草原

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Abstract:

?流体湍流发展的宏观原因是速度剪切效应和温度剪切效应共同作用的结果.从这一观点出发,利用内蒙古草原地区春季近地层通量观测资料,得到了描述不同稳定度条件的湍流强度的相似性函数,计算了当地春季晴天湍流强度,并与实验观测湍流强度进行比较分析.结果表明,内蒙古草原地区春季层结不稳定时,相似性函数与稳定度之间满足“2/3规律”;中性条件下结构函数为常数;层结稳定时结构函数形式比较复杂.计算的湍流强度与实际测量湍流强度之间存在良好的相关性,体现了相似性函数的准确性及湍流强度定理在草原地区的适用性.

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